Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 3234c Report Date: 09-May-96:18:13 Version: ********** Check-in Date: ********** 1.Proposal Title: X-RAY BINARIES ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR ASTROPHYSICS GTO/HSP 1097 Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Robert C. Bless WISCONSIN, UNIVERSITY OF USA (608)262-1715 ------------------------------------------------------------------------------------ 7. Abstract The extreme conditions existing in the near vicinity of neutron stars which are the secondaries in close binaries provide a laboratory in which we may observationally confirm or refine many of our basic theories of astrophysics. This program will monitor the photometric and polarimetric light curves of X-ray binaries at several different phases of the binary orbit in several different wavelength bands in the UV. The results will be related to the structure of, and physical conditions existing in, the gas streams (and possibly, the accretion disk) in these systems. Revision History: Prepared for future cycles submission--BJW 4/21/92; ------------------------------------------------------------------------------------ 8. Scientific Key Words: X-RAY BINARIES: NEUTRON STARS: BLACK HOLES ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 19.69 par: 0 10. Num targs pri: 10 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 3234c PI: Robert C. Bless Proposal Title: X-RAY BINARIES ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ G. W. Van Citters NATIONAL SCIENCE FOUNDATION USA Robert C. Bless WISCONSIN, UNIVERSITY OF USA Joseph F. Dolan NASA, GODDARD SPACE FLIGHT USA CENTER James L. Elliot MASSACHUSETTS INSTITUTE OF USA TECHNOLOGY Edward L. Robinson TEXAS, UNIVERSITY OF USA Richard L. White SPACE TELESCOPE SCIENCE USA INSTITUTE ------------------------------------------------------------------------------------ 3. Description of proposed observations. The photometric and polarimetric light curves of each target will be built up by measuring the magnitude and linear polarization of the system in several different wavelength bands at several different phases in one orbit. Investigation of temporal variations in any gas stream will require observations over several different orbits. Some of these systems undergo substantial luminosity changes in the optical or X-ray region of the spectrum; the observations will be repeated for each different luminosity state the system assumes. Cycle 0 (SV/GTO) observations: Exposure lines 37 to 41.84 on 1 month centers Cycle 1 (SV/GTO) observations: Exposure lines 42.9-47.75 and 55-60 on 1 month centers ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. UV radiation is believed to originate closer to the accretion disk around the secondary in X-ray binaries than does longer wavelength optical radiation. Hence, observations in the UV, accessible only to ST, will probe a different region of the gas streams between the stars than can be done in the optical. It is expected that the results will be more directly relatable to the conditions existing near the neutron star. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. The observations must be correlated with the period of the binary to obtain the desired light curves. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Given scattering from gas streams, the polarimetric (q, u) plot can determine the location of the stream relative to the line of centers and the orbital plane and the eccentricity of the scattering location's orbit about the primary (Dolan and Tapie, Astron. Ap., 139, 249, 1984; Dolan, Astron. Ap., 138, 1, 1984; and references cited therein). The phases at which photometric and polarimetric variability occur provide the longitudinal location of the gas streams; the magnitude of the varitions cn be related to the total amount of material in the stream. The ionization state of the stream can be determined from the dependence of the polarimetric variability on wavelength: Rayleigh scattering varies as the inverse 4th power of the wavelength and indicates neutral atoms as the scattering agents; Thomson scattering is independent of wavelength and indicate free electrons (i.e., ionized atoms) as the scattering agents. Variations in phase of features on the photometric and Page 3 ------------------------------------------------------------------------------------ 12. The X-ray binaries program is directly related to the first scientific objective listed in the HSP CEI specifications, "determination of the properties of ... X- ray binaries, gas streams and accretion disks in compact binary systems", and to the fifth scientific objective, "determination of the wavelength and time dependence of polarization in compact binaries". ------------------------------------------------------------------------------------ 13. Photometric and polarimetric light curves of X-ray binaries will be established at several different UV wavelengths. Changes in these light curves will be monitored as a function of the luminosity state of the system. The results will be related to the structure of, and physical conditions in, the gas streams and accretion disk in these close binaries. ------------------------------------------------------------------------------------ 11. Address Information Name: ROBERT C. BLESS Category: PI Institution: UNIVERSITY OF WISCONSIN Address: SPACE ASTRONOMY LAB. 1150 UNIVERSITY AVE. City: MADISON State: WI Zip Code: 53706 Country: USA Telephone: 608-262-1715 Telex (or e-mail): ------------------------------------------------------------------------------------ Name: JOSEPH F. DOLAN Category: CON Institution: NASA, GODDARD SPACE FLIGHT CENTER Address: CODE 681 City: GREENBELT State: MD Zip Code: 20771 Country: USA Telephone: (301)286-5920 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 3234c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD77581 VELA X-RAY BINARY RA = 09H 02M 06.779S +/- 2000 1 V=6.9 -XR-1 0.1S, DEC = -40D 33' 17.635" +/- 1" Comments: SAO 220767 POSREF = SAO CATALOG, WITH PM ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3234c [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 0.5 DEFINE # HSP/ ACQ DATA- 1 0.01S 6 1 # ACQ2 UV2 FORMAT=ANALOG ------------------------------------------------------------------------------------------------------------------------------------ 0.6 DEFINE # HSP/ ACQ DATA- 1 0.01S 6 1 # ACQP POL FORMAT=ANALOG ------------------------------------------------------------------------------------------------------------------------------------ 0.7 DEFINE # HSP/ ACQ DATA- 1 0.3S # 1 # CTR2 UV2 FORMAT=ANALOG ------------------------------------------------------------------------------------------------------------------------------------ 0.9 DEFINE # HSP/ ACQ DATA- 1 0.3S # 1 # CTRP POL FORMAT=ANALOG ------------------------------------------------------------------------------------------------------------------------------------ 0.95 DEFINE # HSP/ ACQ DATA- 1 0.3S # 1 # CTR1 UV1 FORMAT=ANALOG ------------------------------------------------------------------------------------------------------------------------------------ 1 DEFINE # HSP/ SINGLE 1.0 F145M SAMPLE- 1 20S 100 1 # FIRST UV2 TIME=0.0000108 ------------------------------------------------------------------------------------------------------------------------------------ 2 ^ # ^ ^ ^ F184W ^ ^ ^ ^ # ------------------------------------------------------------------------------------------------------------------------------------ 3 ^ # ^ ^ ^ F284M ^ ^ ^ ^ # ------------------------------------------------------------------------------------------------------------------------------------ 4 ^ # ^ ^ ^ F248M ^ ^ ^ ^ # ------------------------------------------------------------------------------------------------------------------------------------ 5 DEFINE # HSP/ SINGLE 1.0 F220W SAMPLE- 1 20S 100 1 # FIRST1 UV1 TIME=0.0000108 ------------------------------------------------------------------------------------------------------------------------------------ 6 DEFINE # HSP/ SINGLE POL0 # SAMPLE-TIME=0.1 ^ 30S ^ # SEQ 6-9 NO GAP POL POL ------------------------------------------------------------------------------------------------------------------------------------ 7 ^ # ^ ^ POL90 # ^ ^ ^ ^ # ------------------------------------------------------------------------------------------------------------------------------------ 8 DEFINE # HSP/ SINGLE POL45 # SAMPLE-TIME=0.1 1 30S 100 1 # POL POL ------------------------------------------------------------------------------------------------------------------------------------ 9 ^ # ^ ^ POL135 # ^ ^ ^ ^ # ------------------------------------------------------------------------------------------------------------------------------------ 23 DEFINE # HSP/ SINGLE 1.0 F248M SAMPLE- 1 20S 100 1 # REP UV2 TIME=0.0000108 ------------------------------------------------------------------------------------------------------------------------------------ 42.9 USE HD77581 3 ONBOARD ACQ FOR 43 ACQ2 CYCLE 2 / 42.9- 47.85 PCS MODE FINE / 42.9-47.85 ------------------------------------------------------------------------------------------------------------------------------------ 43 USE HD77581 ^ SEQ 42.9-47.005 NO FIRST GAP ------------------------------------------------------------------------------------------------------------------------------------ 43.3 USE ^ 10 2 ONBOARD ACQ FOR CTR1 0.3S 43.5 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3234c [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 43.5 USE HD77581 ^ FIRST1 ------------------------------------------------------------------------------------------------------------------------------------ 43.7 USE HD77581 10 2 ONBOARD ACQ FOR 44 CTRP 0.3S -47.005 ------------------------------------------------------------------------------------------------------------------------------------ 44 USE POL HD77581 F216M X1.5 3 ------------------------------------------------------------------------------------------------------------------------------------ 45 ^ ^ F237M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 45.5 ^ ^ F237M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 46 USE POL HD77581 F277M ^ 3 ------------------------------------------------------------------------------------------------------------------------------------ 46.5 USE POL HD77581 F277M ^ 3 ------------------------------------------------------------------------------------------------------------------------------------ 47 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.005 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.01 USE ^ 2 ONBOARD ACQ FOR ACQP 47.02-47.036 SEQ 47.010-47.050 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 47.02 USE POL HD77581 F277M X1.5 2 AFTER 47.005 BY 0.896D +/- 0.053D ------------------------------------------------------------------------------------------------------------------------------------ 47.03 USE POL HD77581 F327M X1.5 2 ------------------------------------------------------------------------------------------------------------------------------------ 47.033 USE POL ^ F277M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.036 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.04 USE ^ 15 2 ONBOARD ACQ FOR CTR2 0.1S 47.050 ------------------------------------------------------------------------------------------------------------------------------------ 47.05 USE REP ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.11 USE ^ 2 ONBOARD ACQ FOR ACQP 47.12-47.136 SEQ 47.110-47.150 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 47.12 USE POL ^ F277M X1.5 ^ AFTER 47.050 BY 0.896D +/- 0.053D ------------------------------------------------------------------------------------------------------------------------------------ 47.13 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.133 USE POL ^ F277M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.136 USE POL HD77581 F327M X1.5 2 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3234c [ 7] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 47.14 USE HD77581 15 2 ONBOARD ACQ FOR CTR2 0.1S 47.150 ------------------------------------------------------------------------------------------------------------------------------------ 47.15 USE REP ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.21 USE ^ 2 ONBOARD ACQ FOR ACQP 47.22-47.236 SEQ 47.210-47.250 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 47.22 USE POL ^ F277M X1.5 ^ AFTER 47.150 BY 0.896D +/- 0.053D ------------------------------------------------------------------------------------------------------------------------------------ 47.23 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.233 USE POL ^ F277M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.236 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.24 USE ^ 15 2 ONBOARD ACQ FOR CTR2 0.1S 47.250 ------------------------------------------------------------------------------------------------------------------------------------ 47.25 USE REP ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.31 USE HD77581 2 ONBOARD ACQ FOR ACQP 47.32-47.336 SEQ 47.31-47.35 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 47.32 USE POL HD77581 F277M X1.5 2 AFTER 47.250 BY 0.896D +/- 0.053D ------------------------------------------------------------------------------------------------------------------------------------ 47.33 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.333 USE POL ^ F277M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.336 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.34 USE ^ 15 2 ONBOARD ACQ FOR CTR2 0.1S 47.350 ------------------------------------------------------------------------------------------------------------------------------------ 47.35 USE REP ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.41 USE ^ 2 ONBOARD ACQ FOR ACQP 47.420-47.436 SEQ 47.41-47.45 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 47.42 USE POL ^ F277M X1.5 ^ AFTER 47.350 BY 0.896D +/- 0.053D ------------------------------------------------------------------------------------------------------------------------------------ 47.43 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3234c [ 8] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 47.433 USE POL HD77581 F277M X1.5 2 ------------------------------------------------------------------------------------------------------------------------------------ 47.436 USE POL HD77581 F327M X1.5 2 ------------------------------------------------------------------------------------------------------------------------------------ 47.44 USE ^ 15 2 ONBOARD ACQ FOR CTR2 0.1S 47.450 ------------------------------------------------------------------------------------------------------------------------------------ 47.45 USE REP ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.51 USE ^ 2 ONBOARD ACQ FOR ACQP 47.52-47.536 SEQ 47.51-47.55 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 47.52 USE POL ^ F277M X1.5 ^ AFTER 47.450 BY 0.896D +/- 0.053D ------------------------------------------------------------------------------------------------------------------------------------ 47.53 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.533 USE POL ^ F277M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.536 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.54 USE ^ 15 2 ONBOARD ACQ FOR CTR2 0.1S 47.550 ------------------------------------------------------------------------------------------------------------------------------------ 47.55 USE REP HD77581 2 ------------------------------------------------------------------------------------------------------------------------------------ 47.61 USE HD77581 2 ONBOARD ACQ FOR ACQP 47.62-47.636 SEQ 47.61-47.65 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 47.62 USE POL ^ F277M X1.5 ^ AFTER 47.550 BY 0.896D +/- 0.053D ------------------------------------------------------------------------------------------------------------------------------------ 47.63 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.633 USE POL ^ F277M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.636 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.64 USE ^ 15 2 ONBOARD ACQ FOR CTR2 0.1S 47.650 ------------------------------------------------------------------------------------------------------------------------------------ 47.65 USE REP ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.71 USE ^ 2 ONBOARD ACQ FOR ACQP 47.72-47.736 SEQ 47.71-47.75 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3234c [ 9] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 47.72 USE POL ^ F277M X1.5 ^ AFTER 47.650 BY 0.896D +/- 0.053D ------------------------------------------------------------------------------------------------------------------------------------ 47.73 USE POL HD77581 F327M X1.5 2 ------------------------------------------------------------------------------------------------------------------------------------ 47.733 USE POL HD77581 F277M X1.5 2 ------------------------------------------------------------------------------------------------------------------------------------ 47.736 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.74 USE ^ 15 2 ONBOARD ACQ FOR CTR2 0.1S 47.750 ------------------------------------------------------------------------------------------------------------------------------------ 47.75 USE REP ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.81 USE ^ 2 ONBOARD ACQ FOR ACQP 47.82-47.836 SEQ 47.81-47.85 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 47.82 USE POL ^ F277M X1.5 ^ AFTER 47.750 BY 0.896D +/- 0.053D ------------------------------------------------------------------------------------------------------------------------------------ 47.83 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.833 USE POL ^ F277M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.836 ^ ^ F327M ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 47.84 USE HD77581 15 2 ONBOARD ACQ FOR CTR2 0.1S 47.850 ------------------------------------------------------------------------------------------------------------------------------------ 47.85 USE REP HD77581 2 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 3234c [ 10] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HSP/UV2 HSP/POL HSP/UV1 ^ ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ SINGLE ^ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters DATA-FORMAT=ANALOG SAMPLE-TIME=0.0000108 SAMPLE-TIME=0.1 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/HSP ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 19.69 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR ASTROPHYSICS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SEQ 6-9 NO GAP; ONBOARD ACQ FOR 43; CYCLE 2 / 42.9-47.85; PCS MODE FINE / 42.9-47.85; SEQ 42.9-47.005 NO GAP; ONBOARD ACQ FOR 43.5; ONBOARD ACQ FOR 44-47.005; ONBOARD ACQ FOR 47.02-47.036; SEQ 47.010-47.050 NO GAP; AFTER 47.005 BY 0.896D +/- 0.053D; ONBOARD ACQ FOR 47.050; ONBOARD ACQ FOR 47.12-47.136; SEQ 47.110-47.150 NO GAP; AFTER 47.050 BY 0.896D +/- 0.053D; ONBOARD ACQ FOR 47.150; ONBOARD ACQ FOR 47.22-47.236; SEQ 47.210-47.250 NO GAP; AFTER 47.150 BY 0.896D +/- 0.053D; ONBOARD ACQ FOR 47.250; ONBOARD ACQ FOR 47.32-47.336; SEQ 47.31-47.35 NO GAP; AFTER 47.250 BY 0.896D +/- 0.053D; ONBOARD ACQ FOR 47.350; ONBOARD ACQ FOR 47.420-47.436; SEQ 47.41-47.45 NO GAP; AFTER 47.350 BY 0.896D +/- 0.053D; ONBOARD ACQ FOR 47.450; ONBOARD ACQ FOR 47.52-47.536; SEQ 47.51-47.55 NO GAP; AFTER 47.450 BY 0.896D +/- 0.053D; ONBOARD ACQ FOR 47.550; ONBOARD ACQ FOR 47.62-47.636; SEQ 47.61-47.65 NO GAP; AFTER 47.550 BY 0.896D +/- 0.053D; ONBOARD ACQ FOR 47.650; ONBOARD ACQ FOR 47.72-47.736; SEQ 47.71-47.75 NO GAP; AFTER 47.650 BY 0.896D +/- 0.053D; ONBOARD ACQ FOR 47.750; ONBOARD ACQ FOR 47.82-47.836; SEQ 47.81-47.85 NO GAP; AFTER 47.750 BY 0.896D +/- 0.053D; ONBOARD ACQ FOR 47.850; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F145M F184W F284M F248M F220W # F216M F237M F277M F327M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD77581 VELA-XR-1 ------------------------------------------------------------------------------------------------------------------------------------