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2\27 ISS On-Orbit Status 27-02-2003
Part 2 of 2

U.S. and Russian Segment Status (as of 1:10pm EST).

Environmental Control and Life Support (ECLSS) and Thermal Control 
(TCS):  Elektron O2 generator is powered On (24 Amp mode). Vozdukh CO2 
scrubber is On (Manual mode 5). U.S. CDRA CO2 scrubber is Off. TCCS 
(trace contaminant control subsystem) is operating. MCA (major 
constituents analyzer) is operating. BMP Harmful Impurities unit: 
Absorbent bed #1 in Regeneration mode, bed #2 in Purify mode. RS air 
conditioner SKV-1 is On; SKV-2 is Off.

SM Working Compartment: Pressure (mmHg) -- 753; temperature (deg C)
 -- 26.7; ppO2 (mmHg) -- 183.0; ppCO2 (mmHg) -- 2.4 (suspect).
SM Transfer Compartment: Pressure (mmHg) -- 751; temperature (deg C)
 -- 20.4.
FGB Cabin: Pressure (mmHg) -- 752; temperature (deg C) -- 22.3.
Node: Pressure (mmHg) -- 741.98; temperature (deg C) -- 24.0 (shell);
 ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab: Pressure (mmHg) -- 744.21; temperature (deg C) -- 21.9;
 ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a;
Joint Airlock (Equip. Lock): Pressure (mmHg) -- 744.31; temperature
 (deg C) -- 21.1; shell heater temp (deg C) -- 22.3, ppO2 (mmHg)
 -- 167.2; ppCO2 (mmHg) -- 4.1.
PMA-1: Shell heater temp (deg C) -- 24.2
PMA-2: Shell heater temp (deg C) -- 12.7
(n/a = data not available)

Propulsion System (PS): Total propellant load available [SM(820)
 + FGB(2753) + Progress(576)] -- 4149 kg (9147 lb) as of 2/27/03.
 (Capability: SM -- 860 kg; FGB -- 6120 kg).

Electrical Power Systems (EPS):
Both P6 channels fully operational. Beta Gimbal Assembly (BGA) 2B
 and 4B both in auto track (sun following) mode.
SM batteries: All batteries (8) are in "Partial Charge" mode.
FGB batteries: All batteries (6) 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): 2 redundant lanes (of 3) operational.
 Lane 1 is out of the set (as of 11/14/02).
SM Central Computer (TsVM): 3 redundant lanes (of 3) operational.

Attitude Control Systems:
3 CMGs on-line (CMG-1 failed).
State vector source -- Russian
Attitude source -- Russian
Angular rate source -- U.S. RGA-1

Flight Attitude:
XPOP (x-axis perpendicular to orbit plane = "sun-fixed" [yaw: 0 deg,
pitch: -8.8 deg., roll: 0 deg]), with CMG/Thruster Assist Momentum
Management).
Solar Beta Angle: -43.2 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 MBS PDGF2 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, 7:05am EST [= epoch]):
Mean altitude -- 391.0 km
Apogee -- 399.2 km
Perigee -- 382.8 km
Period -- 92.38 min.
Inclination (to Equator) -- 51.63 deg
Eccentricity -- 0.0012128
Orbits per 24-hr. day -- 15.59
Mean altitude loss in last 24 hours -- 130m
Solar Beta Angle -- -43.2 deg (magnitude decreasing)
Revolutions since FGB/Zarya launch (Nov. '98) -- 24389

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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