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11 June 2003

ISS On-Orbit Status 11 June 2003

Part 2 of 2

U.S. and Russian Segment Status (as of 1:15pm EST).

Environmental Control and Life Support (ECLSS) and Thermal Control
(TCS):

Elektron O2 generator is powered On (20 amp mode).  Vozdukh CO2
scrubber is On (automatic mode).  U.S. CDRA CO2 scrubber is Off.
TCCS (trace contaminant control subsystem) is operating.  MCA (major
constituents analyzer) is operating.  BMP Harmful Impurities unit:
absorbent bed #1 in Purify mode, bed #2 in Regeneration mode.  RS air
conditioner SKV-1 is On; SKV-2 is Off.

Propulsion System (PS):

Total propellant load available: 3478 kg (7668 lb) as of 6/5
[SM(774) + FGB(2547) + Progress(182)].  (Capability: SM -- 860 kg;
FGB -- 6120 kg). 

Electrical Power Systems (EPS):

Both P6 channels fully operational.  BGA (beta gimbal assembly) 2B
and 4B both in fixed dual angle mode, with "night glider" drag
reduction.
SM batteries:  All batteries (8) are in "Partial Charge" mode.
FGB batteries:  Battery #4 is disconnected; battery #6 is in "Cycle"
mode; all other batteries (4) are in "Partial Charge" mode.
Plasma Contactor Unit PCU-1 in Standby mode; PCU-2 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-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.
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-1

Flight Attitude:

LVLH -YVV (local vertical/local horizontal = "earth-fixed": z-axis in
local vertical, -y-axis in velocity vector [yaw: -10 deg, pitch: -7.2
deg, roll: 0 deg]), with CMG/TA (thruster assist) Momentum
Management.
Solar Beta angle:  -7.0 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 at WS4, with KA power.
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, 5:11am EDT [= epoch]):

Mean altitude -- 389.3 km
Apogee -- 393.8 km
Perigee -- 384.8 km
Period -- 92.34 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0006604
Orbits per 24-hr. day -- 15.59
Solar Beta Angle -- -7.0 deg (magnitude decreasing)
Mean altitude loss in last 24 hours -- 110 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 26009
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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