Voyager Mission Operations Status Report # 2011-12-23,  Week Ending December 23, 2011

 

Command Transmission & Verification Operations

 

Voyager 1 command operations consisted of the uplink of a Command Loss Timer Reset on 12/20 [DOY 354/2045z].  The command was not radiated due to a transmitter failure over DSS-14 [DR G112196]. The uplink was scheduled three days later on 12/23 [DOY 357/1930z] and again the command failed to radiate due to a different problem with the transmitter over DSS-14 [DR G112205]. There were no other command operations during the period.

 

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 12/21 [DOY 355/2152z].  The spacecraft received two of the seven commands sent.

 

Sequence Generation Operations

 

Complete sequence development of A082A and B154C.  Continue development of B155A.

 

Data Return Operations

 

Voyager 1 Data Processing and Operations:

 

There were 24.3 hours of DSN scheduled support for Voyager 1 of which 20.3 hours were large aperture coverage. There was one schedule support change on 12/23 [DOY 357] when 2.1 hours of DSS-14 support was released.  The total actual support for the period was 22.2 hours of which 18.2 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 December 23.  The EDR backlog is 1 days.

 

 

Voyager 2 Data Processing and Operations:

 

There were 27.1 hours of DSN scheduled support for Voyager 2 of which 17.1 hours were large aperture coverage.  There were no real-time or schedule support changes made during the period.

 

There was one significant outage of 0.5 hours on 12/18 [DOY 352] due to rain at DSS-43 [DR C108383].

 

Science instrument performance was nominal for all activities during this period.  The EDR backlog is 1 days.

 

 

Flight System Performance

 

Voyager 1 performance was nominal during this report period.

 

Voyager 2 performance was nominal during this report period.

 

PROPELLANT/POWER CONSUMABLES STATUS AS OF THIS REPORT

 

 

Spacecraft

Consumption

One Week (Gm)

Propellant

Remaining (Kg)

Output

(Watts)

Margin

(Watts)

1

5.42

23.97

267.1

33

2

4.47

27.02

268.3

28

 

 

RANGE, VELOCITY AND ROUND TRIP LIGHT TIME AS OF THIS REPORT

 

 

Voyager 1

Voyager 2

Distance from the Sun (Km)

17,839,000,000

14,551,000,000

Distance from the Sun (Mi)

11,085,000,000

9,042,000,000

Distance from the Earth (Km)

17,955,000,000

14,667,000,000

Distance from the Earth (Mi)

11,157,000,000

9,114,000,000

Total Distance Traveled Since Launch (Km)

23,721,000,000

22,676,000,000

Total Distance Traveled Since Launch (Mi)

14,740,000,000

14,090,000,000

Velocity Relative to Sun  (Km/sec)

17.050

15.450

Velocity Relative to Sun  (Mi/hr)

38,139

34,560

Velocity Relative to Earth  (Km/sec)

32.710

37.502

Velocity Relative to Earth  (Mi/hr)

73,169

83,889

Round Trip Light Time (hh:mm:ss)

33:15:26

27:10:44