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25 Mar 2003

FOR OFFICIAL USE ONLY

ISS On-Orbit Status 3/24/03

Part 2 of 2

Today's targets for the CEO (crew earth observations) program (with
illumination is now, on Vernal Equinox, rapidly shifting from the
Southern to the Northern Hemisphere, and light soon too low for
southernmost targets like lower Patagonia) were Lake Eyre, Australia
(the CEO ground team has no recent images of this target area in this
El Nino cycle. Looking left of track for views of as much of the
lake's mostly dry basin as possible), and Industrialized Southeastern
Africa (the ISS pass offered fine oblique views of the South Africa's
industrial corridor to the right of track. The crew was to document
the position and extent of smog palls there). 
CEO images can be viewed at the websites
http://eol.jsc.nasa.gov and
http://earthobservatory.nasa.gov

U.S. and Russian Segment Status (as of 1:18pm EST).

Environmental Control and Life Support (ECLSS) and Thermal Control
(TCS):Elektron O2 generator is powered On (24 Amp). 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 Purify mode, bed #2 in Purify mode. RS air
conditioner SKV-1 is On; SKV-2 is Off. 

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 #7 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: 68.0 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.
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, 7:06am EST [= epoch]):
Mean altitude -- 390.2 km
Apogee -- 395.8 km
Perigee -- 384.6 km
Period -- 92.36 min.
Inclination (to Equator) -- 51.63 deg
Eccentricity -- 0.0008261
Orbits per 24-hr. day -- 15.59
Solar Beta Angle: 68.0 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 100 m
Revolutions since FGB/Zarya launch (Nov. '98) -- 24779

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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