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11 Apr 2003

ISS On-Orbit Status 10 Apr 2003

Part 3 of 3

Command & Data Handling Systems:

C&C-1 MDM is prime, C&C-2 is back-up, and C&C-3 is in standby.
GNC-1 MDM is prime; GNC-2 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:

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: -9.1 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 (after EVA).
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, 11:45am EDT [= epoch]):

Mean altitude  393.3 km
Apogee -- 395.6 km
Perigee -- 391.1 km
Period -- 92.42 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0003284
Orbits per 24-hr. day -- 15.58
Solar Beta Angle:  -9.1 deg (magnitude increasing)
Mean altitude gain in last 24 hours -- 2600 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 25047
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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