Voyager Mission Operations Status
Report # 2009-04-17, Week Ending April 17, 2009
Command Transmission &
Verification Operations
Voyager 1 command operations consisted of the uplink of a Command Loss Timer Reset on 04/15 [DOY 105/2230z]. The spacecraft received the command.
Voyager 2 command operations consisted of the uplink of a Command Loss Timer Reset and CCSL B142B on 04/13 [DOY 103/1645z]. The spacecraft received all commands sent and the CCSL was verified.
Sequence Generation Operations
Continue
sequence development of CCSL B144.
Data Return Operations
Voyager
1 Data Processing and Operations:
There were 94.9 hours of DSN scheduled support for Voyager 1 of which 45.7 hours were large aperture coverage. There were seven schedule support changes made. Two changes released DSS-63 support to Ulysses. The first change released 1.7 hours on 4/17 [DOY 101] and the second on 4/15 [DOY 105] released 5.3 hours. Two support changes replaced support for DSS-14 down due to a Red antenna. The first on 4/13 [DOY 103] replaces 8.9 hours with 6.4 hours of DSS-15 and DSS-26 support. The next on 4/15 [DOY 105] replaced 3.0 hours with 1.3 hours of DSS-15support. The other two schedule support changes added 5.2 hours of DSS-63 on 4/16 [DOY 106] and deleted 1.9 hours of DSS-63 support on 4/17 [DOY 107]. The actual support for the period was 87.0 hours of which 30.1 hours were large aperture coverage.
There were two significant outages both due to rain over DSS-65on consecutive days. The first outage of 0.5 hours occurred on 04/13 [DOY 103, DR M105306] and the second on 04/14 [DOY 104, DR M105309].
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 April 10. The EDR backlog is 2 days.
Voyager
2 Data Processing and Operations:
There were 62.2 hours of
DSN scheduled support for Voyager 2 of which 36.4 hours were large aperture
coverage. There were four schedule support changes made. Three of the changes added three separate
DSS-43 tracks on 04/11 [DOY 101] due to an early return to operations
(RTO). The extra DSS-43 time added 19.3
hours in place of 0.7 hours of DSS-34support. The fourth schedule change on
04/14 [DOY 104] replaced 3.1 hours of DSS-43 with 3.2 hours of DSS-45support. The total actual support for the period was 80.9
hours of which 52.7 hours were large aperture coverage
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.
Voyager
2 performance was nominal during this report period. Activities included X-Band high power, a full
memory readout, and X-Band low power on 4/17 [DOY 106].
PROPELLANT/POWER CONSUMABLES
STATUS AS OF THIS REPORT
|
Spacecraft |
Consumption One Week (Gm) |
Propellant Remaining (Kg) |
Output (Watts) |
Margin (Watts) |
|
1 |
4.70 |
26.72 |
278.3 |
29 |
|
2 |
4.67 |
28.42 |
279.6 |
39 |
RANGE, VELOCITY AND ROUND TRIP
LIGHT TIME AS OF 4/17/2009
|
|
Voyager 1 |
Voyager 2 |
|
Distance
from the Sun (Km) |
16,401,000,000 |
13,285,000,000 |
|
Distance
from the Sun (Mi) |
10,191,000,000 |
8,255,000,000 |
|
Distance
from the Earth (Km) |
16,318,000,000 |
13,268,000,000 |
|
Distance
from the Earth (Mi) |
10,139,000,000 |
8,244,000,000 |
|
Total
Distance Traveled Since Launch (Km) |
20,815,000,000 |
19,852,000,000 |
|
Total
Distance Traveled Since Launch (Mi) |
12,934,000,000 |
12,336,000,000 |
|
Velocity
Relative to Sun (Km/sec) |
17.087 |
15.512 |
|
Velocity
Relative to Sun (Mi/hr) |
38,222 |
34,699 |
|
Velocity
Relative to Earth (Km/sec) |
22.204 |
22.384 |
|
Velocity
Relative to Earth (Mi/hr) |
49,668 |
50,072 |
|
Round
Trip Light Time (hh:mm:ss) |
30:13:24 |
24:35:02 |