Voyager Mission Operations Status Report # 2010-05-14,  Week Ending May 14, 2010

 

Command Transmission & Verification Operations

 

Voyager 1 command operations consisted of the uplink of a Command Loss Timer Reset, CCSL A075 and AHELIO SID MRO’S on 05/12 [DOY 132/0300z].  The spacecraft received all commands sent and the CCSL was verified.

 

Voyager 2 command operations consisted of the uplink of BAY 1 HTR OFF,  X/B HIGH PWR and EH-12 4 FDS FULL MRO’S on 05/11 [DOY 131/0755z]. The spacecraft received all commands sent and the FDS MRO was verified.

 

Sequence Generation Operations

 

No overlay sequence development activity during this report period.

 

Data Return Operations

 

Voyager 1 Data Processing and Operations:

 

There were 85.2 hours of DSN scheduled support for Voyager 1 of which 21.3 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 May 14.  The EDR backlog is 2 day.

 

Voyager 2 Data Processing and Operations:

 

There were 67.9 hours of DSN scheduled support for Voyager 2 of which 37.8 hours were large aperture coverage.  There were no real-time or schedule support changes made or significant outages during the period.

 

The down link telemetry format for the entire period remained in the engineering format EL-40 due to the ongoing spacecraft Flight Data System (FDS) anomaly with the Science telemetry format, CR-5T (ISA 35395).  The engineering data format was commanded to the High Rate Engineering Mode, FD-12, on 05/12 [DOY 132/2033:32 – 2117:26]. 

 

Four passes of the spacecraft Full FDS memory was read-out during this period.  Each memory read-out was compared against a memory mask.  It was discovered that a single bit had changed from a 1 to a 0 in the Write Protected Memory of the FDS that contained the FDS software that processed the science format CR-5T.  Anomaly analysis continued through the period.

 

No science data was received since day 112 due to the Flight Data System (FDS) anomaly on the spacecraft.  The EDR backlog is 0 days.

 

 

Flight System Performance

 

Voyager 1 performance was nominal during this report period.  Activity included switching to X-Band low power and turning on the Bay 1 Heater on 5/13 [DOY 133].

 

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

43.06*

26.15

273.7

28

2

19.37**

27.86

275.0

15

*MAGROL 2010-127       **EL-40 telemetry [DOY 112 thru 133]

 

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

 

 

Voyager 1

Voyager 2

Distance from the Sun (Km)

16,976,000,000

13,791,000,000

Distance from the Sun (Mi)

10,549,000,000

8,569,000,000

Distance from the Earth (Km)

16,861,000,000

13,721,000,000

Distance from the Earth (Mi)

10,477,000,000

8,526,000,000

Total Distance Traveled Since Launch (Km)

21,918,000,000

20,942,000,000

Total Distance Traveled Since Launch (Mi)

13,619,000,000

13,013,000,000

Velocity Relative to Sun  (Km/sec)

17.069

15.484

Velocity Relative to Sun  (Mi/hr)

38,181

34,637

Velocity Relative to Earth  (Km/sec)

27.589

23.789

Velocity Relative to Earth  (Mi/hr)

61,714

53,214

Round Trip Light Time (hh:mm:ss)

31:13:50

25:25:26