Voyager Mission Operations Status Report #1193 — 8-14 Sep 2001

COMMAND TRANSMISSION & VERIFICATION OPERATIONS

Voyager 1 command operations consisted of the uplink of a Slew Test and
Pitch DB Mini Sequence on 09/09 [DOY 252/0400z] plus a command loss timer
reset on 09/11 [DOY254/0200z].Ê 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 1.0 Hz steps on
09/11 [DOY 254/1607z].ÊÊ The commands were not sent due to the closure of
the laboratory.

SEQUENCE GENERATION OPERATIONS

Continue sequence development of CCSL A041.

DATA RETURN OPERATIONS

Voyager 1 Data Processing and Operations:

There were 53.9 hours of DSN scheduled support for Voyager 1 of which 8.9
hours were large aperture coverage. There were no real-time or schedule
support changes during the period.

There was one significant outage of 0.7 hours duration due to antenna
pointing problems [DR C100340] at DSS-34 on 09/11 [DOY 254].

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

Voyager 2 Data Processing and Operations:

There were 51.4 hours of DSN scheduled support for Voyager 2 of which 25.7
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.Ê One frame of GS-4 data was recorded this week.Ê The EDR backlog is
9 days.

FLIGHT SYSTEM PERFORMANCE

Voyager 1 performance was nominal during this report period.Ê Activities
included turning on Gyros A&B and a PMPCAL on 9/11 (DOY 254/255).

Voyager 2 performance was nominal during this report period.Ê Activities
included an ASCAL on 9/11 (DOY 254) and a MAGROL on 9/14 (DOY 257).

          PROPELLANT/POWER CONSUMABLES STATUS AS OF 9-13-01/9-14-01

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

       31           11.62*           31.29          311.6           19

       32            11.42           33.14          313.2           44
ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ *APPW Patch

delinked 01-253/0244

           RANGE, VELOCITY AND ROUND TRIP LIGHT TIME AS OF 9/14/01

                               Voyager 1              Voyager 2

Distance from the Sun       12,313,000,000          9,730,000,000

(Km)

Distance from the Sun        7,651,000,000          6,046,000,000

(Mi)

Distance from the Earth     12,335,000,000          9,673,000,000

(Km)

Distance from the Earth      7,665,000,000          6,017,000,000

(Mi)

Total Distance Traveled

Since

                            14,128,000,000         13,266,000,000

Launch (Km)

Total Distance Traveled

Since

                             8,779,000,000          8,243,000,000

Launch (Mi)

Velocity Relative to

Sun

                                17.243                 15.740

Ê(Km/sec)

Velocity Relative to

Sun

                                38,571                 35,210

Ê(Mi/hr)

Velocity Relative to

Earth

                                44.822                 40.780

Ê(Km/sec)

Velocity Relative to

Earth

                                100,264                91,223

Ê(Mi/hr)

Round Trip Light Time
(Hours:Minutes:Seconds)        22:51:36               17:55:38