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17 May 2003

ISS On-Orbit Status 16 May 2003

Part 2 of 2

For 5/21, MCC-H has scheduled an Increment 7 Payload Science
Conference with SO Dr. Lu.  Participants on the ground will include
the Program Scientist, Lead Increment Scientist, NASA's Chief
Scientist, and others.  Among the points to be discussed are an
overview of Inc. 7 science, and science "outside of the box".

Work on reboost planning continues.  Moscow is making plans for a
mid-June date for the first reboost maneuver and seeks NASA
agreement.  Final decision to be made by IMMT (ISS Mission Management
Team) middle of next week.

Flight attitude continues to be XPOP (x-axis perpendicular to orbit
plane), with the P6 solar wings locked in directed "sun slicer"
position, calculated for atmospheric drag reduction.  [When the
currently increasing solar Beta angle reaches 60 deg, attitude will
be moded to YVV/"barbecue" to keep truss radiator motor temperatures
under the limit of 75 degC.  Attitude will return to XPOP when Beta
decreases to 60 deg and below.  Drag-reduction-bias angle of the
solar arrays is such that their power generation is at least 11 kW on
each of the two channels (2B and 4B).] 

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 Lisbon, Portugal(nadir pass), Tornado damage,
Midwest (Dynamic event: Swaths of downed trees and dead vegetation
generated by recent tornados may be visible between clouds.  Swaths
should have appeared obliquely left of track in Kansas, Oklahoma and
Missouri, oriented ENE), Havana, Cuba (nadir pass), Los Angeles,
California (excellent nadir pass. Crew was to try for the city in a
minimum number of views.  Then views of the whole Baja peninsula
appeared right of track), and Guadalajara, Mexico (nadir pass). CEO
images can be viewed at the websites http://eol.jsc.nasa.gov and
http://earthobservatory.nasa.gov

U.S. and Russian Segment Status (as of 1:50pm 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) -- 27.8; ppO2 (mmHg) --
data invalid; ppCO2 (mmHg) -- data invalid. SM Transfer Compartment:
Pressure (mmHg) -- 751; temperature (deg C) -- 20.7.

FGB Cabin:  Pressure (mmHg) -- 748; temperature (deg C) -- 22.0.
Node:  Pressure (mmHg) -- 745.16; temperature (deg C) -- 23.8
(shell); ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab:  Pressure (mmHg) -- 747.04; temperature (deg C) -- 22.5;
ppO2 (mmHg) -- 172.0; ppCO2 (mmHg) -- 4.2.
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 747.14; temperature
(deg C) -- 31.1; shell heater temp (deg C) -- n/a, ppO2 (mmHg) --
n/a; ppCO2 (mmHg) -- n/a.
PMA-1:  Shell heater temp (deg C) -- n/a.
PMA-2:  Shell heater temp (deg C) -- n/a.
(n/a = data not available)

Propulsion System (PS): Total propellant load available: 3576 kg
(7884 lb) as of 5/8 [SM(774) + FGB(2550) + 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 "directed" (non-solar tracking) mode ("sun slicer"
position, for drag reduction).
SM batteries:  Battery #4 is disconnected; battery #8 suspected
failed; battery #7 in "Cycle" mode; all other batteries (5) are in
"Partial Charge" mode; battery #2 performs degraded.
FGB batteries:  Battery #2 is in "Cycle" mode; all other batteries
(5) are in "Partial Charge" mode.
Plasma Contactor Unit PCU-1 in Standby mode; PCU-2 in Discharge 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:  53.0 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 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, 7:16am EDT [= epoch]):

Mean altitude -- 389.6 km
Apogee -- 393.9 km
Perigee -- 385.4 km
Period -- 92.35 min.
Inclination (to Equator) --  51.63 deg
Eccentricity -- 0.0006286
Orbits per 24-hr. day -- 15.59
Solar Beta Angle:  53.0 deg (magnitude increasing)
Mean altitude loss in last 24 hours -- 85 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 25605
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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