VOYAGER MISSION OPERATIONS STATUS REPORT #1085, AUGUST 14 THROUGH AUGUST 20, 1999

COMMAND TRANSMISSION & VERIFICATION OPERATIONS

Voyager 1 command operations consisted of a command loss timer reset on 08/17 [DOY 229/1830z]. 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 08/18 [DOY 230/1157z] at DSS-43. The spacecraft received elements two through six of the seven sent.

SEQUENCE GENERATION OPERATIONS

Submitted draft Sequence Requests for CCSL A033 to the SIE.

DATA RETURN OPERATIONS

Voyager 1 Data Processing and Operations:

There were 103.9 hours of DSN scheduled support for Voyager 1 of which 85.1 hours were large aperture coverage. There were no real-time or schedule support changes 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 with the PLS modulator switched off. The EDR backlog is 9 days.

Voyager 2 Data Processing and Operations:

There were 86.0 hours of DSN scheduled support for Voyager 2 of which 44.4 hours were large aperture coverage. There were no real-time or schedule support changes made during the period.

There was one significant outage on 8/20 [DOY 232] when 4.0 hours of data were degraded due to unknown causes at DSS-42 [DR A03934].

Science instrument performance was nominal for all activities during this period. One frame of GS-4 data was recorded this week. The EDR backlog is 9 days.

FLIGHT SYSTEM PERFORMANCE

Voyager 1 performance was nominal during this report period. Major activities included DTR Maintenance and a PMPCAL on 8/17 (DOY 229/230).

Voyager 2 performance was nominal during this report period.

PROPELLANT/POWER CONSUMABLES STATUS AS OF 8-11-99/8-13-99


Spacecraft
Consumption
One Week (Gm)
Propellant
Remaining (Kg)
Output
(Watts)
Margin
(Watts)
31
6.32
32.26
321.3
40
32
13.31
34.05
322.9
68

RANGE, VELOCITY AND ROUND TRIP LIGHT TIME AS OF 8/20/99
Voyager 1
Voyager 2

Distance from the Sun (Km)

11,196,000,000
8,776,000,000

Distance from the Sun (Mi)

6,957,000,000
5,453,000,000

Distance from the Earth (Km)

11,167,000,000
8,672,000,000

Distance from the Earth (Mi)

6,939,000,000
5,388,000,000

Total Distance Traveled Since
Launch (Km)


13,000,000,000
12,234,000,000

Total Distance Traveled Since
Launch (Mi)


8,078,000,000
7,602,000,000

Velocity Relative to Sun
(Km/sec)


17.294
15.829

Velocity Relative to Sun
(Mi/hr)


38,684
35,408

Velocity Relative to Earth
(Km/sec)


43.880
38.292

Velocity Relative to Earth
(Mi/hr)


98,157
85,655

Round Trip Light Time
(Hours:Minutes:Seconds)


20:41:46
16:04:18