home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.space.news
- Path: sparky!uunet!think.com!ames!dont-send-mail-to-path-lines
- From: baalke@kelvin.Jpl.Nasa.Gov (Ron Baalke)
- Subject: Ulysses Update - 01/18/93
- Message-ID: <21JAN199318531661@kelvin.jpl.nasa.gov>
- To: sci-space-news@ames.arc.nasa.gov
- Followup-To: sci.space
- News-Software: VAX/VMS VNEWS 1.41
- Keywords: Ulysses, JPL, ESA
- Sender: digester@news.arc.nasa.gov
- Nntp-Posting-Host: kelvin.jpl.nasa.gov
- Organization: Jet Propulsion Laboratory
- Date: Thu, 21 Jan 1993 18:53:00 GMT
- Approved: sci-space-news@ames.arc.nasa.gov
- Lines: 126
-
- Forwarded from Peter Beech, Ulysses Mission Operations Manager
-
- SUBJECT: ULYSSES MISSION OPERATIONS REPORT No. 125
-
- PERIOD: 12th January to 18th January 1993
-
- 1. MISSION OPERATIONS
-
- Experiment reconfigurations have been carried out as
- required.
-
- A HUS (Solar X-ray instrument) calibration test was conducted on
- 12th January.
-
- A HED (Magnetic Field instrument) calibration was conducted on
- 13th January.
-
- A KEP EPAC (Energetic Particles instrument) in-flight calibration
- was conducted on 18th January.
-
- Routine Earth pointing manoeuvres were performed on 14th and
- 17th January.
-
- An average of 92.06 % data recovery was achieved during the
- reporting period.
-
- The percentage of data acquired as a function of bit rate is
- as follows:
-
- 1024 bps 49.63 %
- 512 bps 42.37 %
-
- The lower than normal data recovery for this reporting
- period was due to a maser low noise amplifier failure at
- Goldstone which caused a complete loss of a scheduled pass.
- The outage was minimised by support being provided from the
- Canberra station. A total of 10 hours of real time data
- were lost.
-
- 2. SPACECRAFT STATUS
-
- POWER
-
- Nominal.
- Estimated S/C power consumption 257 watts.
-
- AOCS
-
- Nominal.
- TTC
-
- The spacecraft is currently configured with receiver 2 as
- the prime unit fed via the high gain antenna and with
- receiver 1 as backup fed through the low gain antenna (LGA-
- F). The downlink is provided through EPC2/TWTA2.
-
- The 34 meter ground stations are in use to support TTC
- operations. Ranging from 34 meter ground stations is
- performed when the spacecraft is configured for bit rates of
- 1024 bps or less. Ranging passes from 70 meter ground
- stations are also being taken periodically.
-
- Received downlink level -138 dBm.(34 meter) X-band.
-
- (Variations of up to 10 db. can be expected as a result of
- station antenna in use, local weather conditions, and
- spacecraft antenna off-pointing).
-
- Received uplink level -123 dBm.
-
- DATA HANDLING
-
- Nominal.
-
- THERMAL
-
- Nominal.
-
- 3. FLIGHT DYNAMICS
-
- Solar Aspect The angle reduced from 9.85 on
- Angle (deg.) 12th January to 9.24 on 18th January.
-
- Sun-Probe-Earth The angle reduced from 9.81 on
- Angle (deg.) 12th January to 9.12 on 18th January.
-
- Spin Rate 4.980 rpm.
-
- 4. ORBITAL DATA
-
- Data taken at 13:00 PDT on 18th January.
- Distance from Earth 657,698,384 km.
- Velocity relative to the Earth 124,022 km/hr.
- Velocity relative to the Sun 34,220 km/hr.
- Ecliptic latitude 16.7 deg/south
-
- 5. PLANNED OPERATIONS
-
- Routine data gathering operations will continue together
- with experiment reconfigurations as required.
- On 19th January a KEP GAS (Interstellar Neutral Gas instrument)
- monthly health check will be carried out.
-
- On 25th January a KEP EPAC in-flight calibration will be
- carried out.
-
- Earth pointing manoeuvres will be performed on 20th and 23rd
- January.
-
- Periods of 2048 bps at low antenna elevations will continue
- to be avoided to improve the signal to noise ratio. This
- will slightly reduce the percentage of 1024 bps real-time
- data received.
-
- 6. GROUND SEGMENT
-
- The ground segment performed nominally during the reporting
- period with the exception of the Goldstone maser problem
- referred to above.
- ___ _____ ___
- /_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
- | | | | __ \ /| | | | Jet Propulsion Lab |
- ___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Every once in a while,
- /___| | | | ___/ | |/__ /| Pasadena, CA 91109 | try pushing your luck.
- |_____|/ |_|/ |_____|/ |
-
-