Voyager Mission Operations Status Report # 2013-09-20 Week Ending  September 20, 2013

 

Command Transmission & Verification Operations

 

There were no command operations in support of Voyager 1 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 09/17 [DOY 260/1752z].  The spacecraft received two of the seven commands sent.

 

Sequence Generation Operations

 

Continue sequence development of CCSL A089.

 

Data Return Operations

 

Voyager 1 Data Processing and Operations:

 

There were 67.6 hours of DSN scheduled support for Voyager 1 of which 56.2 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 September 15.  The third frame of GS-4 data was recorded on September 20.  The EDR backlog is 2 days.

 

 

Voyager 2 Data Processing and Operations:

 

There were 60.5 hours of DSN scheduled support for Voyager 2 of which 22.4 hours were large aperture coverage.  There were no real-time or schedule support changes made during the period.

 

There were two significant outages both due to heavy rain.  The first outage of 1.7 hours occurred over DSS-43 on 09/16 [DOY 259, DR C109534].  The second outage of 1.5 hours occurred two days later during a DSS-45 support on 09/18 [DOY 261, DR C109540]

 

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 switching to X-Band high power, executing a MAGROL, followed by gyros OFF, and switching back to X-Band low power on 9/18 (DOY 261/262).

 

Voyager 2 performance was nominal during this report period.  Activity included a PMPCAL on 9/17 (DOY 261).

 

PROPELLANT/POWER CONSUMABLES STATUS AS OF THIS REPORT

 

 

Spacecraft

Consumption

One Week (Gm)

Propellant

Remaining (Kg)

Output

(Watts)

Margin

(Watts)

1

47.75*

20.09

260.0

22

2

53.61**

26.07

261.1

29

                                                          *MAGROL 2013-261          **MAGROL 2013-256

 

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

 

 

Voyager 1

Voyager 2

Distance from the Sun (Km)

18,773,000,000

15,376,000,000

Distance from the Sun (Mi)

11,665,000,000

9,554,000,000

Distance from the Earth (Km)

18,799,000,000

15,329,000,000

Distance from the Earth (Mi)

11,681,000,000

9,525,000,000

Total Distance Traveled Since Launch (Km)

25,487,000,000

24,420,000,000

Total Distance Traveled Since Launch (Mi)

15,837,000,000

15,174,000,000

Velocity Relative to Sun  (Km/sec)

17.037

15.424

Velocity Relative to Sun  (Mi/hr)

38,110

34,501

Velocity Relative to Earth  (Km/sec)

44.570

40.846

Velocity Relative to Earth  (Mi/hr)

99,699

91,371

Round Trip Light Time (hh:mm:ss)

34:49:22

28:24:26