Voyager 1 & 2 Mission Operations Status Report #1190 –18-24 Aug 2001

COMMAND TRANSMISSION & VERIFICATION OPERATIONS

Voyager 1 command operations consisted of the uplink of a command loss timer
reset, a CCS and FDS MRO on 08/21 [DOY 233/0220z].  The spacecraft received
all commands sent.

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
08/21 [DOY 233/1612z].   The spacecraft received four of the seven commands
sent.

SEQUENCE GENERATION OPERATIONS

Started sequence development of overlay CCSL A041.

DATA RETURN OPERATIONS

Voyager 1 Data Processing and Operations:

There were 84.6 hours of DSN scheduled support for Voyager 1 of which 17.8
hours were large aperture coverage.  There was one schedule change made
during the period, on 08/20 [DOY 232], when 4.1 hours of DSS-65 support was
released to support STARDUST.  The total actual support for the period was
80.5 hours of which 17.8 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.  The EDR backlog is
9 days.

Voyager 2 Data Processing and Operations:

There were 61.2 hours of DSN scheduled support for Voyager 2 of which 26.3
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 August 24, using the BHELI 1 cyclic, which was
enabled on July 14.  The EDR backlog is 9 days.

FLIGHT SYSTEM PERFORMANCE

Voyager 1 performance was nominal during this report period.

Voyager 2 performance was nominal during this report period.  Activity
included a PMPCAL on 8/21 (DOY 233).

PROPELLANT/POWER CONSUMABLES STATUS AS OF 8-23-01/8-24-01

                  Consumption     Propellant       Output         Margin
   Spacecraft    One Week (Gm)  Remaining (Kg)     (Watts)       (Watts)

       31            7.56            31.31          311.9           33

       32            9.32            33.17          313.5           62

RANGE, VELOCITY AND ROUND TRIP LIGHT TIME AS OF 8/24/01

                               Voyager 1              Voyager 2

Distance from the Sun       12,282,000,000          9,703,000,000

(Km)

Distance from the Sun        7,632,000,000          6,029,000,000

(Mi)

Distance from the Earth     12,261,000,000          9,607,000,000

(Km)

Distance from the Earth      7,618,000,000          5,970,000,000

(Mi)

Total Distance Traveled

Since

                            14,097,000,000         13,237,000,000

Launch (Km)

Total Distance Traveled

Since

                             8,759,000,000          8,225,000,000

Launch (Mi)

Velocity Relative to

Sun

                                17.244                 15.743

 (Km/sec)

Velocity Relative to

Sun

                                38,574                 35,215

 (Mi/hr)

Velocity Relative to

Earth

                                44.129                 38.772

 (Km/sec)

Velocity Relative to

Earth

                                98,714                 86,731

 (Mi/hr)

Round Trip Light Time

(Hours:Minutes:Seconds)        22:43:18               17:48:16