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26 Mar 2003

FOR OFFICIAL USE ONLY

ISS On-Orbit Status 3/25/03

Part 2 of 2

SM Working Compartment: Pressure (mmHg) -- 745; temperature (deg C)
-- 27.4; ppO2 (mmHg) -- 183.1; ppCO2 (mmHg) -- 2.3 (data suspect).
SM Transfer Compartment: Pressure (mmHg) -- 751; temperature (deg C)
-- 21.1.
FGB Cabin: Pressure (mmHg) -- 752; temperature (deg C) -- 22.3.
Node: Pressure (mmHg) -- 740.07; temperature (deg C) -- 23.3 (shell);
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab: Pressure (mmHg) -- 742.09; temperature (deg C) -- 22.2;
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a;
Joint Airlock (Equip. Lock): Pressure (mmHg) -- 742.19; temperature
(deg C) -- 21.0; shell heater temp (deg C) -- 21.8, ppO2 (mmHg) --
165.8; ppCO2 (mmHg) -- 3.9.
PMA-1: Shell heater temp (deg C) -- 24.4
PMA-2: Shell heater temp (deg C) -- 12.7
(n/a = data not available)

Propulsion System (PS):
Total propellant load available [SM(774) + FGB(2746) + Progress(474]
--- 3994 kg (8805 lb) as of 3/20/03. (Capability: SM -- 860 kg;
FGB -- 6120 kg). 

Electrical Power Systems (EPS):
Both P6 channels fully operational. BGA (beta gimbal assembly) 2B and
4B both in Directed Position (278 deg & 82 deg) to minimize
aerodynamic drag. SM batteries: Battery #8 is in "Cycle" mode; all
other batteries (7) are in "Partial Charge" mode.
FGB batteries: Battery #2 is off line; all other batteries (5) are in
"Partial Charge" mode.
Plasma Contactor Unit PCU-1 and PCU-2 both 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-2 MDM is prime; GNC-1 is Backup.
INT-1 is operating; INT-2 is Off.
EXT-1 is On (primary), EXT-2 is Off.
LA-1, LA-2 and LA-3 MDMs are all operating.
PL-2 MDM is On (primary); PL-1 MDM is Off
APS-1 (automated payload switch #1) and APS-2 are both On.
SM Terminal Computer (TVM): 3 redundant lanes (of 3) operational.
Being upgraded.
SM Central Computer (TsVM): 3 redundant lanes (of 3) operational.
Being upgraded.

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-2

Flight Attitude:
XPOP (x-axis perpendicular to orbit plane = "sun-fixed" [yaw: -179.0
deg, pitch: -8.8 deg., roll: 0 deg]), with CMG TA (thruster assist)
Momentum Management.
Solar Beta Angle: 51.0 deg (magnitude decreasing).

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.
Ku-band is operating nominally.
Audio subsystem operating nominally.
Video subsystem operating nominally (VTR1 is operable again).
HCOR (high-rate communications outage recorder) is operating
nominally.

Robotics:
SSRMS/Canadarm2 based at Lab PDGF with Keep Alive (KA) power on both
strings.
MBS: KA power on both strings.
MT: latched at WS4, with KA power.
POA: KA power on both strings.
RWS (robotics workstations): Lab RWS is Off; Cupola RWS is Off.

ISS Orbit (as of this morning, 7:44am EST [= epoch]):
Mean altitude -- 390.1 km
Apogee -- 395.7 km
Perigee -- 384.5 km
Period -- 92.36 min.
Inclination (to Equator) -- 51.63 deg
Eccentricity -- 0.0008336
Orbits per 24-hr. day -- 15.59
Solar Beta Angle: 51.0 deg (magnitude decreasing)
Mean altitude loss in last 24 hours -- 90 m
Revolutions since FGB/Zarya launch (Nov. '98) -- 24795

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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