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09 May 2003

ISS On-Orbit Status 8 May 2003

Part 2 of 2

Today's CEO (crew earth observations) targets, including cities
during daylight and at night (again available as targets in the
current LVLH attitude) were Athens, Greece (nadir pass; ESC [
electronic still camera]), Eastern Mediterranean aerosols (pass from
Greece to Sinai: looking left for smog buildup), Nile River Delta
(land use patterns are the center of interest.  Looking nadir and
right for the new developments along the Suez Canal), Cape Town,
South Africa (looking left for South Africa's second largest port;
ESC), Midwest tornado damage (Dynamic event.  Recent tornadoes
have killed ~40 people.  Looking left for about two minutes for
swaths, up to a mile wide and 10-20 miles long, in Kansas and
Missouri, oriented ENE), Miami, Florida (nadir pass; ESC), Las Vegas,
Nevada (nadir pass; ESC), Phoenix, Arizona (nadir pass; ESC), Tucson,
Arizona (nadir pass; ESC), Lake Poopo, Bolivia (handheld images
suggest that Lake Poopo is a proxy for precipitation in the high, dry
Andes.  Lake levels tend to drop during El Niņos and should therefore
be approaching their lowest as the present El Niņo winds down), and
El Paso, Texas (city at night; nadir and a touch right).
http://eol.jsc.nasa.gov and http://earthobservatory.nasa.gov

U.S. and Russian Segment Status (as of 1:25pm EST).

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

Elektron O2 generator is powered On (24 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)
-- 27.8; ppO2 (mmHg) -- data invalid; ppCO2 (mmHg) -- data invalid.
SM Transfer Compartment:  Pressure (mmHg) -- 751; temperature (deg C)
-- 19.8.
FGB Cabin:  Pressure (mmHg) -- 744; temperature (deg C) -- 21.0.
Node:  Pressure (mmHg) -- 740.71; temperature (deg C) -- 22.2
(shell); ppO2 (mmHg) -- 170.1; ppCO2 (mmHg) -- 3.3.
U.S. Lab:  Pressure (mmHg) -- 743.00; temperature (deg C) -- 22.4;
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 743.10; temperature
(deg C) -- 22.0; shell heater temp (deg C) -- 22.8, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) -- n/a.
PMA-1:  Shell heater temp (deg C) -- 23.6
PMA-2:  Shell heater temp (deg C) -- 20.7

(n/a = data not available)

Propulsion System (PS):

Total propellant load available: 3607 kg (7952 lb) as of 5/1
[SM(774) + FGB(2581) + 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 directed position (Blind mode, non solar-tracking,
drag reduction). 

SM batteries:  Battery #4 is disconnected, in stand-alone ops;
battery #2 in "Cycle" mode; 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-1 (GPS)
Angular rate source -- RGA-2

Flight Attitude:

LVLH (local vertical/local horizontal = "earth-fixed": z-axis in
local vertical, x-axis in velocity vector [yaw: -10 deg, pitch: -7.2
deg, roll: 0 deg]), with CMG/TA (thruster assist) Momentum
Management. Solar Beta angle: 14.7 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; VTR2 in
troubleshooting).
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, 7:55am EDT [= epoch]):

Mean altitude -- 390.2 km
Apogee -- 394.6 km
Perigee -- 385.8 km
Period -- 92.36 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0006636
Orbits per 24-hr. day -- 15.59
Solar Beta Angle:  14.7 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 110 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 25481
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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