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21 Jun 2003

ISS On-Orbit Status 20 Jun 2003

Part 2 of 2

Today's CEO (crew earth observation) targets, limited in the current
XPOP attitude by flight rule constraints on the use of the Lab
nadir/science window, and including the targets of the Lewis & Clark
200-year memorial locations, were Fort Mandan, ND (LEWIS & CLARK
SITE:  The ISS had two passes over this site, where the expedition
spent the winter of 1804-5 and where Sacagawea and her husband joined
the group.  The site is near the present town of Stanton.  Looking
left of track and south of the large reservoir, Lake Sacagawea.
Stanton is on the west bank of the Missouri near where it turns
sharply from south to east), Pompey's Pillar, MT (LEWIS & CLARK SITE:
Looking right of track towards the Yellowstone River where it flows
east northeastward from the city of Billings.  This 200 foot high
rock formation is on the south bank of the river near where, from the
west, Interstate Highway 94 pulls to within half a mile of the river
and then parallels it. Captain Clark's dated signature is engraved in
the stone here), and Three Gorges Dam, Yangtze River (while weather
was less than ideal this pass, the crew otherwise had a pretty good
view of this target area from XPOP attitude by looking left of
track.  With the floodgates closed, the river valley above the dam is
now rapidly being inundated). CEO images can be viewed at the
websites http://eol.jsc.nasa.gov http://earthobservatory.nasa.gov See
also the website "Space Station Challenge" at
http://voyager.cet.edu/iss/

U.S. and Russian Segment Status (as of 1:54pm EST).

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

Elektron O2 generator is powered On (18 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.  RS air
conditioner SKV-1 is On; SKV-2 is Off.

SM Working Compartment:  Pressure (mmHg) -- 742; temperature (deg C)
-- 28.5; 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) -- 22.7.
Node:  Pressure (mmHg) -- 745.16; temperature (deg C) -- 23.1
(shell); ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab:  Pressure (mmHg) -- 746.84; temperature (deg C) -- 23.0;
ppO2 (mmHg) -- 172.2; ppCO2 (mmHg) -- 3.3.
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 747.04; temperature
(deg C) -- 30.6; shell heater temp (deg C) -- 25.2, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) -- n/a.
PMA-1:  Shell heater temp (deg C) -- 25.1.
PMA-2:  Shell heater temp (deg C) -- 13.8.

(n/a = data not available)

Propulsion System (PS):

Total propellant load available: 3803 kg (8384 lb) as of 6/19
[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. S

M batteries:  Battery #4 is disconnected; all other batteries (7) are
in "Partial Charge" mode.
FGB batteries:  Battery #4 is disconnected (failed); 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:

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:  -28.0 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 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, 6:25am EDT [= epoch]):

Mean altitude -- 388.4 km
Apogee -- 393.1 km
Perigee -- 383.7km
Period -- 92.32 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0006911
Orbits per 24-hr. day -- 15.60
Solar Beta Angle -- -28.0 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 60 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 26151
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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