Voyager Mission Operations Status Report # 2013-08-16  Week Ending  August 16, 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 08/13 [DOY 225/0757z].  The spacecraft received four of the seven commands sent.

 

Sequence Generation Operations

 

 

Data Return Operations

 

Voyager 1 Data Processing and Operations:

 

There were 93.9 hours of DSN scheduled support for Voyager 1 of which 48.1 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.  Twenty-two frames of data were recovered from a playback of GS-4 data on August 14.  A second frame of GS-4 data was recorded on August 10.  The third frame of GS-4 data was recorded on August 15.  The EDR backlog is 1 days.

 

 

Voyager 2 Data Processing and Operations:

 

There were 69.0 hours of DSN scheduled support for Voyager 2 of which 4.8 hours were large aperture coverage. One support change was made in real-time on 08/12 [DOY 224] when DSS-45 supported 4.9 hours in place of 8.4 hours of DSS-34 down due to a Red antenna [DR C109496].  The total actual support for the period was 66.5 hours of which 4.8 hours were large aperture coverage.

 

There were two significant outages both due to heavy rain over DSS-45.  The first outage of 0.9 hours occurred on 08/11 [DOY 223, DR C109493].  The second outage of 1.9 hours occurred on 08/14 [DOY 226, DR C109500].

 

 

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 LECP Observations followed by gyros OFF on 8/12 (DOY 224-225), A PMPCAL on 8/13 (DOY 226), and an AHELI2 DTR playback of PWS high rate data followed by switching to X-Band low power on 8/14 (DOY 227)

 

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

138.85*

20.16

260.4

26

2

5.04

26.14

261.5

31

                                                            * LECP Observations 2013-224, 225

 

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

 

 

Voyager 1

Voyager 2

Distance from the Sun (Km)

18,722,000,000

15,331,000,000

Distance from the Sun (Mi)

11,633,000,000

9,526,000,000

Distance from the Earth (Km)

18,676,000,000

15,227,000,000

Distance from the Earth (Mi)

11,605,000,000

9,462,000,000

Total Distance Traveled Since Launch (Km)

25,353,000,000

24,301,000,000

Total Distance Traveled Since Launch (Mi)

15,754,000,000

15,100,000,000

Velocity Relative to Sun  (Km/sec)

17.038

15.425

Velocity Relative to Sun  (Mi/hr)

38,111

34,504

Velocity Relative to Earth  (Km/sec)

43.337

37.462

Velocity Relative to Earth  (Mi/hr)

96,941

83,800

Round Trip Light Time (hh:mm:ss)

34:35:40

28:13:02