Voyager Mission Operations Status Report # 2009-09-18, Week Ending September 18, 2009
Command Transmission & Verification Operations
Voyager 1 command operations consisted of the uplink of a Command Loss Timer Reset on 09/16 [DOY 259/2130z]. The spacecraft received the command.
Voyager 2 command operations consisted of the uplink of seven bracketed Command Loss Timer Resets sent on five-minute centers using 1.0 steps on 09/16 [DOY 259/1432z]. The spacecraft received two the seven commands sent.
Sequence Generation Operations
Continue sequence development of CCSL A073.
Data Return Operations
Voyager 1 Data Processing and Operations:
There were 90.8 hours of DSN scheduled support for Voyager 1 of which 28.3 hours were large aperture coverage. One support change was made in real-time on 09/17 [DOY 260] when DSS-25 supported 1.4 hours in place of DSS-14 down due to antenna problems [DR G109698]. The total actual support for the period remained unchanged.
There were three significant outages during the period. The first outage of 0.5 hours on 09/12 [DOY 255] was due an unknown cause in the DSS-26/25 array, no DR written. The second outage of 0.6 hours resulted from antenna problems at DSS-63on 09/14 [DOY 257, DR M105483]. The third outage of 0.8 hours was also caused by antenna problems at DSS-63 on 09/15 [DOY 258, DRs M105485, M105486].
Science instrument performance was nominal for all activities during this period. One frame of GS-4 data was recorded this week. The EDR backlog is 2 day.
Voyager 2 Data Processing and Operations:
There were 58.2 hours of DSN scheduled support for Voyager 2 of which 39.8 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. The EDR backlog is 2 days.
Flight System Performance
Voyager 1 performance was nominal during this report period. Activities included a PMPCAL on 9/15 (DOY 258) and a MAGROL on 9/16 (DOY 259).
Voyager 2 performance was nominal during this report period. Activities included an ASCAL on 9/15 and a MAGROL on 9/18 (DOY 261).
PROPELLANT/POWER CONSUMABLES STATUS AS OF THIS REPORT
|
Spacecraft |
Consumption One Week (Gm) |
Propellant Remaining (Kg) |
Output (Watts) |
Margin (Watts) |
|
1 |
52.71* |
26.48 |
276.5 |
30 |
|
2 |
6.32 |
28.22 |
277.7 |
33 |
*MAGROL 09-259/2143
RANGE, VELOCITY AND ROUND TRIP LIGHT TIME AS OF 9/18/2009
|
|
Voyager 1 |
Voyager 2 |
|
Distance from the Sun (Km) |
16,627,000,000 |
13,484,000,000 |
|
Distance from the Sun (Mi) |
10,332,000,000 |
8,378,000,000 |
|
Distance from the Earth (Km) |
16,651,000,000 |
13,433,000,000 |
|
Distance from the Earth (Mi) |
10,346,000,000 |
8,347,000,000 |
|
Total Distance Traveled Since Launch (Km) |
21,296,000,000 |
20,265,000,000 |
|
Total Distance Traveled Since Launch (Mi) |
13,233,000,000 |
12,592,000,000 |
|
Velocity Relative to Sun (Km/sec) |
17.079 |
15.501 |
|
Velocity Relative to Sun (Mi/hr) |
38,205 |
34,673 |
|
Velocity Relative to Earth (Km/sec) |
44.646 |
40,804 |
|
Velocity Relative to Earth (Mi/hr) |
99,869 |
91,275 |
|
Round Trip Light Time (hh:mm:ss) |
30:50:38 |
24:53:38 |