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- From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
- Subject: Ulysses Update - 12/30/92
- Message-ID: <1992Dec30.214154.19896@news.arc.nasa.gov>
- Followup-To: sci.space
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- Keywords: Ulysses, JPL, ESA
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- Organization: Jet Propulsion Laboratory
- Date: Wed, 30 Dec 1992 21:40:00 GMT
- Approved: sci-space-news@ames.arc.nasa.gov
- Lines: 107
-
- Forwarded from Peter Beech, Ulysses Mission Operations Manager
-
- SUBJECT: ULYSSES MISSION OPERATIONS REPORT No. 122
-
- PERIOD: 22nd December to 28th December 1992
-
- 1. MISSION OPERATIONS
-
- Experiment reconfigurations have been carried out as
- required.
-
- Routine Earth pointing manoeuvre were performed on 23rd and
- 27th December.
-
- An average of 97.9 % data recovery was achieved during the
- reporting period.
-
- The percentage of data acquired as a function of bit rate is
- as follows:
-
- 1024 bps 30.99 %
- 512 bps 66.72 %
-
- 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 has
- recommenced when the spacecraft is configured for low bit
- rate. Ranging passes from 70 meter ground stations are
- being taken periodically.
-
- Received downlink level -141 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 -120 dBm.
-
- DATA HANDLING
-
- Nominal with the exception of the CTU#2 anomaly.
-
- THERMAL
-
- Nominal.
-
- 3. FLIGHT DYNAMICS
-
- Solar Aspect The angle reduced from 11.00 on
- Angle (deg.) 22nd December to 10.80 on 28th December.
-
- Sun-Probe-Earth The angle reduced from 11.05 on
- Angle (deg.) 22nd December to 10.86 on 28th December.
-
- Spin Rate 4.980 rpm.
-
- 4. ORBITAL DATA
-
- Data taken at 13:00 PDT on 28th December.
- Distance from Earth 709,786,729 km.
- Velocity relative to the Earth 128,187 km/hr.
- Velocity relative to the Sun 33,662 km/hr.
- Ecliptic latitude 15.5 deg/south
-
- 5. PLANNED OPERATIONS
-
- Routine data gathering operations will continue together
- with experiment reconfigurations as required.
-
- Earth pointing manoeuvres will be performed on 30th
- December, 3rd and 7th 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.
-
- A Happy New Year from the Ulysses Team to all our readers.
- ___ _____ ___
- /_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
- | | | | __ \ /| | | | Jet Propulsion Lab |
- ___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Choose a job you love, and
- /___| | | | ___/ | |/__ /| Pasadena, CA 91109 | you'll never have to work
- |_____|/ |_|/ |_____|/ | a day in your life.
-
-