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10 July 2003

ISS On-Orbit Status 9 Jul 2003

Part 2 of 2

Electrical Power Systems (EPS):

Both P6 channels fully operational.  BGA (beta gimbal assembly) 2B
and 4B both in directed position (Blind/triple-angle mode, non
solar-tracking, drag reduction)..
SM batteries:  Battery #4 is disconnected (failed 6/16); all other
batteries (7) are in "Partial Charge" mode.  Batteries #1, #2 and #3
showing degraded capacity.
FGB batteries:  Battery #3 is offline; battery #2 is in "Cycle" mode;
all other batteries (4) are in "Partial Charge" mode.
Plasma Contactor Unit PCU-1 in Standby mode; PCU-2 in Standby mode.

Command & Data Handling Systems:

C&C-1 MDM is prime, C&C-2 is back-up, and C&C-3 is in standby.
GNC-1 MDM is prime; GNC-2 is Backup.
INT-1 is operating; INT-2 is Off.
EXT-2 is On (primary), EXT-1 is Off (both now upgraded to R3).
LA-1, LA-2 and LA-3 MDMs are all operating.
PL-2 MDM is Off; PL-1 MDM is Operational.
APS-1 (automated payload switch #1) and APS-2 are both On.
SM Terminal Computer (TVM): 3 redundant lanes (of 3) operational.
SM Central Computer (TsVM): 3 redundant lanes (of 3) operational.

Attitude Control Systems:

3 CMGs on-line (CMG-1 failed).
State vector source -- U.S. SIGI-1 (GPS)
Attitude source -- U.S. SIGI-1 (GPS)
Angular rate source -- RGA-1

Flight Attitude:

LVLH -YVV (local vertical/local horizontal = "earth-fixed": z-axis in
local vertical, -y-axis in velocity vector [yaw: -10 deg, pitch: -9.3
deg, roll: 0 deg]), with CMG/TA (thruster assist) Momentum
Management.
Solar Beta angle:  29.2 deg (magnitude increasing).

Communications & Tracking Systems:

FGB MDM-1 is powered Off; FGB MDM-2 is operational.
All other Russian communications & tracking systems are nominal.
S-band is operating nominally (on string 2).
Ku-band is operating nominally.
Audio subsystem is operating nominally [IAC-1 (internal audio
controller #1) being analyzed after self-test error.  IAC-2 is
prime.]
Video subsystem operating nominally.
HCOR (high-rate communications outage recorder) is operating
nominally. 

Robotics:

SSRMS/Canadarm2 based at MBS PDGF #1 with Keep Alive (KA) power on
both strings.
MBS: KA power on both strings.
MT: latched and mated at WS4.
POA: KA power on both strings.
RWS (robotics workstations): Lab RWS is On (DCP connected); Cupola
RWS is Off.

ISS Orbit  (as of this morning, 7:32am EDT [= epoch]):

Mean altitude -- 386.8 km
Apogee -- 392.3 km
Perigee -- 381.3 km
Period -- 92.29 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0008124
Orbits per 24-hr. day -- 15.60
Solar Beta Angle -- 29.2 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 70 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 26448
For more on ISS orbit and worldwide naked-eye visibility dates/times,
see http://www.hq.nasa.gov/osf/station/viewing/issvis.html

Did you know that...

...a total of 12,000 lbs of food has been consumed onboard ISS as of
this Friday, 11 June, 2003?

...USOS solar arrays are currently generating 17.2 kilowatts of user
power? That's enough to power 300 average light bulbs or 50
top-of-the-line home theater systems.

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