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19 Mar 2003

FOR OFFICIAL USE ONLY

ISS On-Orbit Status 3/18/03

Part 2 of 2

The prop savings (if any) incurred from the recent period of "night
glider" attitude (U.S. solar array wings feathered on the night side
to reduce aerodynamic drag) are being determined at present.

Today's targets for the CEO (crew earth observations) program (no
Cities at Night included until LVLH attitude) were Dakar, Senegal
(shooting left of track to document Dakar in morning sunlight), Lower
Amazon River Basin (crew was asked to image the islands in the Amazon
river to help detect change in size), and Plankton off S. Argentina
(Dynamic Event: Document any visible plankton, right or left of
track. 

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 1:32pm EST).

Environmental Control and Life Support (ECLSS) and Thermal Control
(TCS): Elektron O2 generator is powered Off. Vozdukh CO2 scrubber is
Off. U.S. CDRA CO2 scrubber is On. TCCS (trace contaminant control
subsystem) is operating. MCA (major constituents analyzer) is
operating. BMP Harmful Impurities unit: both filter beds are off. RS
air conditioner SKV-1 is Off; SKV-2 is Off. 

SM Working Compartment: Pressure (mmHg) -- n/a; temperature (deg
C) -- 23.9; ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
SM Transfer Compartment: Pressure (mmHg) -- 751; temperature (deg C)
-- 21.2.
FGB Cabin: Pressure (mmHg) -- 752; temperature (deg C) -- 22.0.
Node: Pressure (mmHg) -- 741.34; temperature (deg C) -- 24.2 (shell);
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab: Pressure (mmHg) -- 743.60; temperature (deg C) -- 22.2;
ppO2 (mmHg) -- 167.1; ppCO2 (mmHg) -- 5.3;
Joint Airlock (Equip. Lock): Pressure (mmHg) -- 743.70; temperature
(deg C) -- 21.1; shell heater temp (deg C) -- 22.1, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) -- n/a.
PMA-1: Shell heater temp (deg C) -- 24.5
PMA-2: Shell heater temp (deg C) -- 12.9
(n/a = data not available)

Propulsion System (PS):
Total propellant load available [SM(786) + FGB(2746) + Progress(490)]
---  4022 kg (8867 lb) as of 3/13/03. (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 Autotrack (sun-following).
SM batteries: All batteries (8) are in "Partial Charge" mode.
FGB batteries: Batteries #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 Momentum Management).
Solar Beta Angle: 43.0 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, 7:56am EST [= epoch]):
Mean altitude -- 390.8 km
Apogee -- 396.4 km
Perigee -- 385.1 km
Period -- 92.37 min.
Inclination (to Equator) -- 51.63 deg
Eccentricity -- 0.0008354
Orbits per 24-hr. day -- 15.59
Solar Beta Angle: 43.0 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 155 m
Revolutions since FGB/Zarya launch (Nov. '98) -- 24686

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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