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9 July 2003

ISS On-Orbit Status 8 July 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); batteries
#2, 6 and 8 are in "Cycle" mode; all other batteries (4) are in
"Partial Charge" mode. Batteries #1, #2 and #3 showing degraded
capacity. FGB batteries:  Battery #3 is offline; battery #1 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:  24.6 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, 8:06am EDT [= epoch]):
Mean altitude -- 386.9 km
Apogee -- 392.3 km
Perigee -- 381.4 km
Period -- 92.29 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0008085
Orbits per 24-hr. day -- 15.60
Solar Beta Angle -- 24.6 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 75 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 26433
For more on ISS orbit and worldwide naked-eye visibility dates/times,
see  http://www.hq.nasa.gov/osf/station/viewing/issvis.html

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