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22 April 2003

ISS On-Orbit Status 21 Apr 2003

Part 3 of 3

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: 0.5
deg, pitch: -8.8 deg., roll: 0 deg]), with CMG TA (thruster assist)
Momentum Management.
Solar Beta Angle: -39.5 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; VTR2 in
troubleshooting).
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, 6:43am EDT [= epoch]):

Mean altitude  392.4 km
Apogee -- 396.8 km
Perigee -- 388.0 km
Period -- 92.40 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0006475
Orbits per 24-hr. day -- 15.58
Solar Beta Angle:  -39.5 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 100 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 25215
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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