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Voyager Mission Operations Status Report #1198 - 13-19 October 2001

Status Report From: Ames Research Center
Posted: Saturday, November 10, 2001


COMMAND TRANSMISSION & VERIFICATION OPERATIONS

Voyager 1 command operations consisted of the uplink of a command loss timer reset on 10/18 [DOY 291/0310z]. The command was not transmitted due to an antenna halt caused by an Az encoder problem at DSS-14 [DR G100432].

Voyager 2 command operations consisted of the uplink of seven bracketed command loss timer resets sent on five-minute centers using 0.5 Hz steps on 10/16 [DOY 289/1352z]. The spacecraft received four of the seven commands sent.

SEQUENCE GENERATION OPERATIONS

Started development of a mini-sequence for Voyager 2.

DATA RETURN OPERATIONS

Voyager 1 Data Processing and Operations:

There were 62.7 hours of DSN scheduled support for Voyager 1 of which 37.6 hours were large aperture coverage. There were no real-time or schedule support changes during the period.

There were two significant outages. The first outage of 0.6 hours duration on 10/18 [DOY 291] resulted from an antenna halt caused by Az encoder problems at DSS-14 [DR G100432]. The second outage of 2.2 hours duration on 10/19 [DOY 292] resulted from signal attenuation caused by rain at DSS-65 [DR L100211].

Science instrument performance was nominal for all activities during this period. One frame of GS-4 data was recorded this week. Fifteen frames of data were played back on October 16, 97% of this data were recovered. Fourteen frames of data were played back on October 17, 94% of this data were recovered. The EDR backlog is 2 days.Voyager 2 Data Processing and Operations:

There were 63.5 hours of DSN scheduled support for Voyager 2 of which 38.1 hours were large aperture coverage. There were no real-time or schedule support changes made or significant outages during the period

Science instrument performance was nominal for all activities during this period. One frame of GS-4 data was recorded this week. A second frame of GS-4 data was recorded on October 13, using the BHELI 1 cyclic, which was enabled on July 14. The EDR backlog is 2 days.

FLIGHT SYSTEM PERFORMANCE

Voyager 1 performance was nominal during this report period. Activities included switching X-Band to Hi Power on 10/15 (DOY 288), DTR PWS playback on 10/16 and 10/17 (DOY 289 and 291), and X-Band to Low power on 10/18 (DOY 289).

Voyager 2 performance was nominal during this report period. Activities included a PMPCAL on 10/16 (DOY 289) and the turning ON of Gyros A & B on 10/18 (DOY 291)

PROPELLANT/POWER CONSUMABLES STATUS AS OF10-18-01/10-19-01

Spacecraft Consumption
One Week (Gm)
Propellant
Remaining (Kg)
Output
(Watts)
Margin
(Watts)
31 10.34 31.20 311.2 29
32 10.11 33.07 312.8 44

RANGE, VELOCITY AND ROUND TRIP LIGHT TIME AS OF 10/19/01

Voyager 1 Voyager 2
Distance from the Sun (Km) 12,365,000,000 9,774,000,000
Distance from the Sun (Mi) 7,683,000,000 6,074,000,000
Distance from the Earth (Km) 12,451,000,000 9,796,000,000
Distance from the Earth (Mi) 7,737,000,000 6,087,000,000
Total Distance Traveled Since
Launch (Km)
14,180,000,00013,313,000,000
Total Distance Traveled Since
Launch (Mi)
8,811,000,0008,273,000,000
Velocity Relative to Sun
(Km/sec)
17.24115.737
Velocity Relative to Sun
(Mi/hr)
38,56635,202
Velocity Relative to Earth
(Km/sec)
43.29742.200
Velocity Relative to Earth
(Mi/hr)
96,85394,397
Round Trip Light Time
(Hours:Minutes:Seconds)
23:04:2618:09:18

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