HUBBLE SPACE TELESCOPE DAILY REPORT #1612 PERIOD COVERED: 0000Z (UTC) 04/12/96 - 0000Z (UTC) 04/15/96 Daily Status Report as of 106/0000Z 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed Two Sets of WF/PC-2 5167 (Jovian Auroral Lyman-Alpha = Profile: Cycle 4 ) The High Resolution spectrograph (Side One) was used to make = ultraviolet spectrographic observations of the northern auroral regions = of the planet Jupiter to study the excitation processes and atmospheric = properties in this region. Observations were also made of it moon Io. = The observations were completed as scheduled, and no anomalies were = reported. 1.2 Completed WF/PC-2 6189 (WF/PC-2 Cycle 5 Calibration: Internal = Monitor - Vis Flats) The WF/PC-2 was used to make internal visual flat calibration = images. Both photometric and narrow-band filters were used. The = observations were executed as planned, and no problems were reported. 1.3 Completed WF/PC-2 6359 (Core Properties of the Bulges of Spiral = Galaxies) The WF/PC-2 was used to make snapshot survey observations of = spiral galaxy NGC-5689 in order to study its central bulge. The aim is = to investigate the core properties, correlation's with global galactic = properties, and the frequency of occurrence of multiple and/or = miscentered nuclei. The observations were completed as scheduled, and no = anomalies were noted. 1.4 Completed FOS/BL 6112 (UV-Bright Liners and the AGN Connection) The Faint Object Spectrograph (Blue Side) was used to make = observations of the active galactic nuclei of the LINER galaxy NGC-5055 = (which is known to have a ultraviolet bright nuclei). The objectives are = to study the ultraviolet properties of LINERs and to relate them to active= galactic nuclei (AGNs) as a whole. The observations were executed as = scheduled, and no anomalies were noted. 1.5 Completed WF/PC-2 5971 (HST Medium Deep Survey) The WF/PC-2 was used to make a long exposure medium deep sky = survey observation at latitudes larger than 10 degrees taken in parallel = with the prime science observations. The observation was executed as = scheduled, and no anomalies were noted. 1.6 Completed Two Sets of WF/PC-2 6363 (The Environments and Host = Galaxies of BL-Lac Objects) The WF/PC-2 was used to make snapshot survey observations of = BL-Lac objects MRK180 and MS1235.4+6 in order to study their environment = and their host galaxies. The goal is to investigate systematic trends in = host galaxy type, unusual morphological features, nearby companion = galaxies, etc. The observations were executed as scheduled, and no = anomalies were noted. 1.7 Completed FOS/RD 6044 (Carbon in the ISM of Spirals) The Faint Object Spectrograph (Red Side) was used to obtain ultravi= olet and optical spectra of the H II regions in the spiral galaxy = NGC-5461. The intent is to derive the C abundances and C/O ratios at = several positions in these galaxies. One of the Mode 2 target = acquisitions for this five-hour proposal failed at 103/183811Z. HSTAR = 5563 was generated. Otherwise, the observations were executed as = scheduled, and no further anomalies were noted. 1.8 Completed FOS/RD/BL 6108 (A Critical Test Case) The Faint Object Spectrograph (Both Red and Blue Sides) were used = to study the ultraviolet absorption lines in the Seyfert galaxy NGC-3516. = These lines are thought to arise from gas located close to the central = engine. The UV spectrum of the target is highly variable; the fluxes = also have varied by a factor of four. The observations were executed as = scheduled, and no anomalies were noted. 1.9 Completed WF/PC-2 6253 (Pure Parallel Archive Program) The WF/PC-2 was used to execute a pure parallel program taking = ultraviolet observations running concurrently with prime science = observations. The intent is to search for extra-galactic sources with = flux excesses at 3000 A0 and galactic sources with excesses at 1600 A0. = The observations were completed as planned, and no problems were = reported. 1.10 Completed WF/PC-2 6250 (WF/PC-2 Cycle 5 Calibration: Internal = Monitor) The WF/PC-2 was used to make a series on internal calibration = observations. Internal flats, biases, and K-Spot calibration images were = taken. These observations are designed to monitor the health of the = cameras. The observations were executed as scheduled, and no anomalies = were noted. 1.11 Completed FOC/96 6421 (Resolving the Unique Magnetic/Non-Magnetic = Double-Degenerate Binary) The Faint Object Camera (f/96) was used to make two separate = observations using two different filters of the unique = magnetic/non-magnetic double degenerate system LB11146. The system is = unique because of the non-magnetic white dwarf (WD) and a magnetic WD. = The magnetic WD has the highest magnetic field known to date for such a = star. The observations were executed as scheduled, and no anomalies were = noted. 1.12 Completed WF/PC-2 6123 (Resolving the Luminous O III Lambda 5007 = Sources in the Early-Type Galaxies.) The WF/PC-2 was used to make observations the planetary nebula = NGC-4486 located in one of the early type galaxies in the Virgo Cluster = in order to resolve its luminous O III regions (Lambda - 5007 A0). This = planetary nebula is significantly brighter than planetaries in other galax= ies. The observations were completed as planned, and no problems were = reported. 1.13 Completed WF/PC-2 6187 (WF/PC-2 Cycle 5 Calibration: Earth Flat) The WF/PC-2 was used to make Earth streak flat calibration images. = These streak flats will be used to produce flat fields, to map the OTA = illumination pattern and, in combination with other data, to produce new = superflats. The observations were completed as planned, and no problems = were reported. 1.14 Completed FOS/BL 5843 (First Ultraviolet Spectrographic Survey of = 2060 Charon) The Faint Object Spectrograph (Blus Side) was used to make = ultraviolet spectrographic observations of the deep solar-system object = 2060-Chiron while it is near perihelion. This will provide information = on the properties of the surface of Chrion and the gas surrounding it. = The observations were executed as scheduled, and no anomalies were noted. 1.15 Completed GHRS/2 6782 (Testing the Theory of Radiative Levitation = in DA White Dwarfs) The High Resolution Spectrograph (Side Two) was used to make = observations of the DA white dwarf star WD1057+719 in order to test the = theory of radiative levitation. This theory predicts that for high = enough temperatures, the radiation pressure should prevent elements = heavier than H or He from sinking out of the atmosphere of the star. A = wave length calibration image was also taken. The observations were = completed as planned, and no anomalies were reported. 1.16 Completed FOS/RD 6091 (Ionization and Abundances of BALQSOs) The Faint Object Spectrograph (Red Side) was used to make = observations of BALQSO 1524+719 in order to study it ionization and = abundances. This QSO is known to show broad absorption lines in its = spectra. The goal is to observe lines from several different ionization = states of Oxygen. The observations were completed as planned, and no = anomalies were reported. 1.17 Completed FGS 6264 (Parallax of RR-Lyrae) The FGSs were used to make astrometric observations of the = variable star RR-Lyrae in order to measure its parallax. RR-Lyrae is the = proto-type for a class of variable stars whose pulsation periods = correlate with their absolute magnitudes. The observations were = completed as planned, and no problems were reported. 1.18 Completed WF/PC-2 6358 (UV Imaging of Circumnuclear Starburst = Rings) The WF/PC-2 was used to make ultraviolet snapshot observations of = galaxy NGC-5728 in order to study its circumnuclear starburst rings. A = homogeneous database of properties of the star-forming region will be = generated. The observations were executed as scheduled, and no anomalies = were noted. 1.19 Completed S/C/FGS/FOS/RD/BL/GHRS/2/FOC/96/WF/PC-2 6848 (1996 = Spring Heptathlon) Twice a year the focal plane of the telescope is verified. The = relative positions of the science instruments were measured (i.e., = S-Spectr1, S-Spect2, S-FOC96, SFGS-Ref, WFC-Center) to determine the = focal plate scale, and to assess the stability of the focal plane and the = FGSs. Stars in astrometric cluster M-35 were used for these = observations. Just before the start of this ten-hour proposal, at = 105/030533Z, a large V1 error was noted (in HSTAR 5564). An attitude = reference update was performed at 105/0436Z. Then, as referenced in = HSTAR 5565, at 105/052847Z, there was an FOS Mode 2 target acquisition = failure. Later, at 105/121218Z, HSTAR 5566 describes the failure of the = FOS YSPEED test, indicating that the microprocessor workload may have = been too heavy. No other anomalies were noted, and the results of the = test are not currently known. 1.20 Completed WF/PC-2 5924 (Nuclear Emission Line Region Associated = with Compact Flat Spectrum) The WF/PC-2 was used to make spectrographic observations of the = nuclear emission region of galaxy NGC-4594 to study its compact flat = spectrum. There is evidence that this jet-produced AGN is powered by = accretion disks feeding massive black hole. The observations were = executed as schedule, and no anomalies were noted. 1.21 Completed WF/PC-2 5920 (Extragalactic Globular Cluster System) The WF/PC-2 was used to make observations to compile a catalogue = of the extragalactic globular clusters in galaxy NGC-5846. A luminosity = function will be derived which should be complete down to the 27th = magnitude in V. The observations was completed as planned, and no = problems were reported. 2.0 FLIGHT OPERATIONS SUMMARY: 2.1 Guide Star Acquisitions: Scheduled Acquisitions : 18 Successful : 18 Scheduled Reacquisitions : 25 Successful : 25 2.2 FHST Updates: Scheduled : 33 Successful : 33 2.3 Operations Notes: TTAC1 "crashed" on two occasions. The first time, TTAC1 was = successfully re-booted; the second time, the DOC switched to TTAC2 when = the re-boot was unsuccessful. The White Sands GTU LGA re-test was successfully completed at = 103/2000Z. 3.0 SIGNIFICANT FORTHCOMING EVENTS: Nothing at this time. /DMH