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01 July 2003

ISS On-Orbit Status 30 Jun 2003

Part 3 of 3

See also the website "Space Station Challenge" at
http://voyager.cet.edu/iss/

U.S. and Russian Segment Status (as of 1:45pm EST).

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

Elektron O2 generator is powered On (16 amp mode).  Vozdukh CO2
scrubber is On (in Manual Mode 3/5).  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 Purify mode (unit is
down).  RS air conditioner SKV-1 is On; SKV-2 is Off.

SM Working Compartment:  Pressure (mmHg) -- 742; temperature (deg C)
-- 27.5; ppO2 (mmHg) -- data invalid; ppCO2 (mmHg) -- data invalid.
SM Transfer Compartment:  Pressure (mmHg) -- 751; temperature (deg C)
-- 20.7.
FGB Cabin:  Pressure (mmHg) -- 752; temperature (deg C) -- 22.3.
Node:  Pressure (mmHg) -- 743.89; temperature (deg C) -- 22.5
(shell); ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab:  Pressure (mmHg) -- 746.03; temperature (deg C) -- 23.1;
ppO2 (mmHg) -- 171.3; ppCO2 (mmHg) -- 4.5.
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 746.13; temperature
(deg C) -- 27.7; shell heater temp (deg C) -- 23.6, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) -- n/a.
PMA-1:  Shell heater temp (deg C) -- 22.9.
PMA-2:  Shell heater temp (deg C) -- 20.4.

(n/a = data not available)

Propulsion System (PS):

Total propellant load available: 3803 kg (8384 lb) as of 6/26
[SM(774) + FGB(2447) + Progress M(182) +Progress M-1(400)].
(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 AutoTrack.
SM batteries:  Battery #4 is disconnected (failed 6/16); all other
batteries (7) are in "Partial Charge" mode.  Batteries #1 and #3
degraded.
FGB batteries:  Battery #3 is offline; all other batteries (5) 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.
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:

LVLH -YVV (local vertical/local horizontal = "earth-fixed": z-axis in
local vertical, -y-axis in velocity vector [yaw: -10 deg, pitch: -9.3
deg, roll: 0 deg]), with CMG/TA (thruster assist) Momentum
Management.
Solar Beta angle:  -9.13 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, 7:43am EDT [= epoch]):

Mean altitude -- 387.5 km
Apogee -- 392.7 km
Perigee -- 382.3km
Period -- 92.31 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0007644
Orbits per 24-hr. day -- 15.60
Solar Beta Angle -- -9.13 deg (magnitude decreasing)
Mean altitude loss in last 24 hours -- 130 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 26308
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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