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08 Apr 2003

ISS On-Orbit Status 7 Apr 2003

Part 2 of 2

A space debris conjunction of the ISS was tracked and evaluated by
MCC-H and MCC-M over the weekend, with the decision point for a DAM
(debris avoidance maneuver) early Saturday morning (2:30am).  No
action was required. [Predictive forward-calculations from tracking
data did not show stable convergence for quite some time as the
decision point came and went, and the DAM was not considered
necessary.  The object fluctuated briefly between the "yellow" and
"red" probability zones briefly for a period, then turned
"yellow"
and finally cleared up.  The crew was informed of the ongoing
tracking before their sleep time.]

Today's CEO (crew earth observations) targets, currently restricted
by flight rule constraints limiting the use of the science window in
the Lab, were Hyderabad, India (nadir pass; ESC [electronic still
camera]), Urumqui, China (nadir pass over this oil-rich city in
China's western province of Sinkiang.  This is China's Muslim west,
agitating for greater autonomy from distant Beijing.  ESC camera),
Recife, Brazil (nadir pass over this coastal city.  ESC camera),
Western Mediterranean Smog (good perspective on smog that is issuing
from central France down the Rhone valley into the Mediterranean
basin.  Shooting obliques left towards the French coast), Algiers,
Algeria (nadir pass over this port city.  ESC camera), Rome, Italy
(nadir pass.  Rome is inland from the coast by 25 miles and somewhat
difficult to discern. ESC camera), Lake Poopo, Bolivia (crew was to
document water levels in this rainfall-sensitive enclosed lake
basin), and Dallas, Texas (Dallas Fort Worth [DFW] metroplex left of
track.  ESC camera). 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 1:45pm EST).

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

Elektron O2 generator is powered On.  Vozdukh CO2 scrubber is On
(manual mode 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) -- 735; temperature (deg C)
-- 27.9; ppO2 (mmHg) -- 180.6 (suspect); ppCO2 (mmHg) -- 2.4 (data
suspect). SM Transfer Compartment:  Pressure (mmHg) -- 741;
temperature (deg C) -- 19.5.
FGB Cabin:  Pressure (mmHg) -- 744; temperature (deg C) -- 21.0.
Node:  Pressure (mmHg) -- 734.35; temperature (deg C) -- 22.3 (
shell); ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a.
U.S. Lab:  Pressure (mmHg) -- 736.63; temperature (deg C) -- 22.4;
ppO2 (mmHg) -- n/a; ppCO2 (mmHg) -- n/a;
Joint Airlock (Equip. Lock):  Pressure (mmHg) -- 736.74; temperature
(deg C) -- 21.2; shell heater temp (deg C) -- 21.3, ppO2 (mmHg) --
163.3; ppCO2 (mmHg) -- 4.1.
PMA-1:  Shell heater temp (deg C) -- 23.3
PMA-2:  Shell heater temp (deg C) -- 19.6

(n/a = data not available)

Propulsion System (PS):

Total propellant load available [SM(774) + FGB(2746) + Progress(474]
--- 3994 kg (8805 lb) as of 4/3/03.  (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 dual-angle ("blind") mode.
SM batteries:  Battery #5 is disconnected; all other batteries (7)
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-1 is On (primary), EXT-2 is Off.
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 TEA (local vertical/local horizontal = "earth-fixed": z-axis in
local vertical, x-axis in velocity vector [yaw: -10 deg, pitch: -9.1
deg, roll: 0 deg]), with CMG/ TA (thruster assist) Momentum
Management).
Solar Beta Angle: 3.5 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.
Ku-band is operating nominally.
Audio subsystem operating nominally.
Video subsystem operating nominally (VTR1 is operable again).
HCOR (high-rate communications outage recorder) is operating
nominally.

Robotics:

SSRMS/Canadarm2 based at Lab PDGF 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, 2:49am EDT [= epoch]):

Mean altitude  391.2 km
Apogee -- 394.1 km
Perigee -- 388.3 km
Period -- 92.38 min.
Inclination (to Equator) --  51.64 deg
Eccentricity -- 0.0004235
Orbits per 24-hr. day -- 15.59
Solar Beta Angle:  3.5 deg (magnitude decreasing)
Mean altitude loss in last 24 hours -- 200 m
Revolutions since FGB/Zarya launch (Nov. '98)  -- 24994
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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