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13 May 2003

ISS On-Orbit Status 12 May 2003

Part 2 of 2

MCC-Moscow is still working the problem of the failed Russian payload
laptop #3.  [The computer is now booting up again but is not restored
as yet. Additionally, the usual uplink procedure for Russian
radiograms via Packet communications is nonfunctional, and neither
can the Packet channel be used for downlinks.  Work continues.]

Today's CEO (crew earth observations) targets, severely restricted by
limited the use of the science window in the Lab due to the current
XPOP attitude, were Smoke, Mexican fires (smoke covers the Gulf of
Mexico between Yucatan and Brownsville (5/9), derived from fires on
the Guatemalan border. Satellites show a smoke mass heading NW,
reaching southern Texas.  Shooting obliques of margins of the smoke
mass.  The Mexican plateau appears to be containing the smoke on the
west side, indicating that smoke is mainly in the lower layers of the
atmosphere), Barcelona, Spain (looking a touch right on the coast),
Tunis, Tunisia (nadir pass), Casablanca, Morocco (nadir pass), and
Patagonian Glaciers (light is rapidly improving over this target.
Shooting left of track, especially obliques for context views.
Handheld photography has supplied the best imagery for science [and
in the case of some glacier tongues, the first detailed imagery] of
this area in existence. This is a site chosen by Russian colleagues).
http://eol.jsc.nasa.gov and http://earthobservatory.nasa.gov

U.S. and Russian Segment Status (as of 1:27pm 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 (manual mode 3).  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.  RS air
conditioner SKV-1 is On; SKV-2 is Off. 

SM Working Compartment:  Pressure (mmHg) -- 742; temperature (deg C)
-- 29.0; ppO2 (mmHg) -- data invalid; ppCO2 (mmHg) -- data invalid.
SM Transfer Compartment:  Pressure (mmHg) -- 751; temperature (deg C)
-- 20.9.
FGB Cabin:  Pressure (mmHg) -- 752; temperature (deg C) -- 22.3.
Node:  Pressure (mmHg) -- 745.8; temperature (deg C) -- 23.8 (shell);
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab:  Pressure (mmHg) -- 747.64; temperature (deg C) -- 22.4;
ppO2 (mmHg) -- 172.7; ppCO2 (mmHg) -- 4.2.
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 747.75; temperature
(deg C) -- 23.0; shell heater temp (deg C) -- 23.0, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) -- n/a.
PMA-1:  Shell heater temp (deg C) -- 24.4
PMA-2:  Shell heater temp (deg C) -- 13.1

(n/a = data not available)

Propulsion System (PS):

Total propellant load available: 3588 kg (7910 lb) as of 5/8
[SM(774) + FGB(2562) + Progress(252)].  (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 solar-tracking Auto mode ("sun slicer" position).
SM batteries:  Battery #4 is disconnected, in stand-alone ops;
battery #2 in "Cycle" mode (degraded); all other batteries (6) are
in "Partial Charge" mode.
FGB batteries:  Battery #5 is disconnected; all other batteries (5)
are in "Partial Charge" mode.
Plasma Contactor Unit PCU-1 and PCU-2 both 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 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-2 (GPS)
Angular rate source -- RGA-2

Flight Attitude:

XPOP (x-axis perpendicular to orbit plane = "sun-fixed" [yaw: 0.5
deg, pitch: -6.8 deg., roll: 0 deg]), with CMG TA (thruster assist).
Solar Beta angle: 34.1 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 (on string 2).
Ku-band is operating nominally.
Audio subsystem operating nominally.
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 Off; Cupola RWS is Off.

ISS Orbit  (as of this morning, 7:52am EDT [= epoch]):

Mean altitude -- 389.9 km
Apogee -- 394.1 km
Perigee -- 385.7 km
Period -- 92.35 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0006211
Orbits per 24-hr. day -- 15.59
Solar Beta Angle:  34.1 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 80 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 25543
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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