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10 Apr 2003

ISS On-Orbit Status 9 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:

LVLH TEA (local vertical/local horizontal = "earth-fixed": z-axis in
local vertical, x-axis in velocity vector [yaw: -10 deg, pitch: -9.1
deg, roll: 0 deg]), with CMG/ TA (thruster assist) Momentum
Management).
Solar Beta Angle: -5.0 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, 6:24am EDT [= epoch]):

Mean altitude  390.9 km
Apogee -- 393.9 km
Perigee -- 387.9 km
Period -- 92.38 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0004441
Orbits per 24-hr. day -- 15.59
Solar Beta Angle:  -5.0 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 135 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 25027
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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