Voyager Mission Operations Status Report # 2009-09-25,  Week Ending  September 25, 2009

 

Command Transmission & Verification Operations

 

Voyager 1 command operations consisted of the uplink of a Command Loss Timer Reset on09/23 [DOY 266/2115z].  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 0.5 Hz steps on 09/24 [DOY 267/1332z].  The spacecraft received four of the seven commands sent.

 

Sequence Generation Operations

 

Continue sequence development of CCSL A073.

 

Data Return Operations

 

Voyager 1 Data Processing and Operations:

 

There were 86.8 hours of DSN scheduled support for Voyager 1 of which 54.6 hours were large aperture coverage. One schedule change was made on 09/24 [DOY 267] when 1.8 hours of DSS-63 support was released to MAP.  The total actual support was 85.0 hours of which 52.8 hours were large aperture coverage.  There were no 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 September 19.  The EDR backlog is 2 day.

 

Voyager 2 Data Processing and Operations:

 

There were 64.3 hours of DSN scheduled support for Voyager 2 of which 32.2 hours were large aperture coverage. Two schedule changes were made. The first change on 09/19 [DOY 262] substituted 1.4 hours of DSS-45 support for 2.3 hours of DSS-43 released.  The second change occurred on 09/25 [DOY 268] released 1.1 hours of DSS-43 support to MAP.  The total actual support was 62.3 hours of which 28.8 hours were large aperture coverage.

 

There was one significant outage of 1.3 hours on 09/22 [DOY 265] due to rain at DSS-45 [DR C107101].

 

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.  Activity included a PMPCAL on 9/22 (DOY 266).

 

PROPELLANT/POWER CONSUMABLES STATUS AS OF THIS REPORT

 

 

Spacecraft

Consumption

One Week (Gm)

Propellant

Remaining (Kg)

Output

(Watts)

Margin

(Watts)

1

4.42

26.48

276.4

31

2

57.46*

28.16

277.6

32

                                                                *MAGROL 09-261/0917

 

RANGE, VELOCITY AND ROUND TRIP LIGHT TIME AS OF 9/25/2009

 

 

Voyager 1

Voyager 2

Distance from the Sun (Km)

16,637,000,000

13,493,000,000

Distance from the Sun (Mi)

10,338,000,000

8,384,000,000

Distance from the Earth (Km)

16,675,000,000

13,456,000,000

Distance from the Earth (Mi)

10,361,000,000

8,361,000,000

Total Distance Traveled Since Launch (Km)

21,323,000,000

20,900,000,000

Total Distance Traveled Since Launch (Mi)

13,250,000,000

12,608,000,000

Velocity Relative to Sun  (Km/sec)

17.079

15.500

Velocity Relative to Sun  (Mi/hr)

38,204

34,672

Velocity Relative to Earth  (Km/sec)

44.536

41.230

Velocity Relative to Earth  (Mi/hr)

99,623

92,227

Round Trip Light Time (hh:mm:ss)

30:53:20

24:56:14