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28 June 2003

ISS On-Orbit Status 27 Jun 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-2 is On (primary), EXT-1 is Off (both now upgraded to R3).
LA-1, LA-2 and LA-3 MDMs are all operating.
PL-2 MDM is Off; PL-1 MDM is Operational.
APS-1 (automated payload switch #1) and APS-2 are both On.
SM Terminal Computer (TVM): 3 redundant lanes (of 3) operational.
SM Central Computer (TsVM): 3 redundant lanes (of 3) operational.

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-1

Flight Attitude:

XPOP (x-axis perpendicular to orbit plane = "sun-fixed" [yaw: 0.5
deg, pitch: -9.0 deg., roll: 0 deg]), with CMG TA (thruster assist).
Management.
Solar Beta angle:  -18.9 deg (magnitude decreasing).

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 (on string 2).
Ku-band is operating nominally.
Audio subsystem is operating nominally [IAC-1 (internal audio
controller #1) being analyzed after self-test error.  IAC-2 is
prime.]
Video subsystem operating nominally.
HCOR (high-rate communications outage recorder) is operating
nominally. 

Robotics:

SSRMS/Canadarm2 based at MBS PDGF #1 with Keep Alive (KA) power on
both strings.
MBS: KA power on both strings.
MT: latched and mated at WS4.
POA: KA power on both strings.
RWS (robotics workstations): Lab RWS is On (DCP connected); Cupola
RWS is Off.

ISS Orbit  (as of this morning, 7:46am EDT [= epoch]):

Mean altitude -- 387.8 km
Apogee -- 392.7 km
Perigee -- 382.9 km
Period -- 92.31 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0007243
Orbits per 24-hr. day -- 15.60
Solar Beta Angle -- -18.9 deg (magnitude decreasing)
Mean altitude loss in last 24 hours -- 90 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 26261
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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