1 EOS Aura Science Team Meeting Angie Kelly EOS Science Interface Manager Constellation Team Manager NASA Goddard Space Flight Center Greenbelt, Md. 20771

1

EOS Aura Science Team

Meeting

Angie Kelly

EOS Science Interface Manager

Constellation Team Manager

NASA Goddard Space Flight Center

Greenbelt, Md. 20771

Report from the Mission Operations

Working Group (MOWG) Meeting

October 28, 2008

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12:30 Greetings/Introduction/Agenda Review All

12:40 EOS Update A. Kelly

1:00 Aura Status B. Guit

1:20 HIRDLS C. Hepplewhite, J. Barnett

1:40 MLS D. Miller/D. Cuddy

2:00 OMIS J. Claas

2:20 OMI DB in Sodankyla O. Aulamo

2:40 TES R. Murdock

3:00 BREAK (15 minutes)

3:15 FD Report: Aura Relocation, Debris Avoidance, Inclination Maneuvers, etc.

J. Levi

3:35 EDOS Status T. Wood

3:55 Ground System Re-engineering Plans & Schedule P. Johnson

4:15 Introduction: FOT Hot Topics (see Operations Splinter Sessions below)

D. Mantziaras

4:30 Summary/Actions/Next Steps All

4:45 -7:00 FOT Hot Topics Splinter Session (2.25 hours) FOT and IOTs

AGENDAEOS AURA Mission Operations Working Group Meeting

3GSFC

MOWG Meeting AttendeesColumbia, Maryland October 2008

4Aura Mission Operations Status

Topics

• Major Activities & Events Since Oct 2007– Aura Relocation

• Spacecraft Subsystems Summary• Anomalies• Planned Activities• Propellant Usage & Lifetime Estimates • Overall Summary• Additional Information


Major Activities/Events(Since last Science Team Meeting on 10/02/07)

• Aura Relocation- completed May 2008

• 06/26/08: Debris Avoidance Maneuver• 07/15/08: 4-Year Anniversary• 08/15/08: HQ Mission Status Review• Continuing Upgrade of the Ground System

– Replacement and upgrade of hardware and software in the Mission Operations Center due to aging hardware/software and new security requirements

– EOS Data Capture and Level Zero Processing (EDOS) Upgrade: enhanced capability to support future missions, e.g., data capture up to 500 Mbps (Dec 2008)

6GSFC

• There are currently 5 satellites in the “A-Train”: Aqua, CloudSat, CALIPSO, PARASOL, and Aura.

• OCO and Glory missions will launch in January and June 2009, respectively

CALIPSO

CloudSat

Aura Relocation In the Afternoon Constellation(A-Train)

Mission MLT

Aqua 01:37:24

CloudSat 01:46:13

CALIPSO 01:46:24

PARASOL 01:36:22

Aura 01:46:00

As of October 22, 2008

7GSFC

• At the request of the Aura Project Scientist, Aura was moved from its current location (15 minutes behind Aqua) to ~ 8 minutes behind Aqua—completed on May 8, 2008

• Aura is now on a different ground track than Aqua (+18 kilometer (East) offset of Aqua’s WRS-2 path) to enable MLS/CloudSat viewing goal

• Aura FOT is maintaining the Control Box to ±10 km (±20 km requirement)

Aura Rephasing (1 of 2)

A-Train Control Box Configuration

8GSFC

Ground track(WRS Paths)

Equator

CloudSat ground track

Orbit PlaneMLTAN – 13:35 13:44

Aqua

PARASOL

MLS

AIRS +/- 825 km

MODIS +/- 1150 km

OMI +/- 1300 km

N

MLS Limb track

Aura

CloudSat CALIPSO

Aura MLS now sees the same air mass as CloudSat and CALIPSO

~7 min 10 sec8 min

7 min

Aura Rephasing (2 of 2)


Spacecraft Subsystems Status

SUBSYSTEM STATUS COMMENTS

Command & Data Handling (CDH)Solid State Recorder (SSR) holds 3 orbits of data

Nominal SSR Formatter Multiplexer Unit (FMU) Anomaly (Dec 4, 2007)

Communications (COMM) Nominal

Electrical Power System (EPS) Nominal Solar Panel Connector Anomaly (Jan 12, 2005)

Flight Software (FSW) Nominal

Guidance, Navigation & Control (GN&C) Nominal

Propulsion (PROP) Nominal Dual Thruster Module (DTM-3) Anomaly (Aug 16, 2005)

Thermal Control System (TCS) Nominal

All subsystems are configured to primary hardware.

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Anomalies Since October 2007

• 12/4/07: Solid State Recorder Anomaly

-- Intensive investigation and contingency planning (Jan- March 2008)

• 03/17/08: HIRDLS Chopper Shutdown– Ongoing recovery activities

• 05/11/08: OMI Row Anomaly #2 • 05/29/08: MLS THz Module SIF5 Electronics Anomaly• 06/01 – 06/04/08: MLS Filter Band 07 Anomaly• 06/09 – 6/12/08: TES to Safe Mode – ICS Only • 10/01/08: JPL reported rapid decline in MLS Band 32

Channels 3 & 4– 10/13/08: JPL reported Band 32 Channels 3 & 4 have

recovered to 96% of their original values and are acceptable for normal science data processing

Aura Mission Operations Status


Planned Activities

• 12/11/08: Drag Make Up Maneuver #16• 2009 Inclination Adjust Maneuvers (IAMs)

– 9-burn sequence over 8-weeks» March 11th, 17th & 19th » April 1st, 7th , 9th , 22nd , 28th & 30th » May 5th , 6th & 7th (Back-Up Dates)

– -0.0957 degree delta-I; 12.794 m/s delta-V

– 21.0 Kg

• Dec 31, 2008: Leap Second• 2009 Senior Review (Mission Ops Input)

– How long can the mission last?

• OCO (1/15/09) and Glory(6/15/09) Launches


Aqua/Aura Inclination Adjust Maneuvers (DRAFT Schedule for March – May 2009)

Sun Mon Tue Wed Thu Fri Sat8 March 9 10 Aqua IAM #16 11 Aura IAM #13 12 Aqua IAM #17 13 14

15 16 17 Aura IAM #14 18 Aqua IAM #18 19 Aura IAM #15 20 EQUINOX

21

22 23 24 Contingency 25 Contingency 26 Contingency 27 28

29 30 31 Aqua IAM #19 1 April

Aura IAM #16

2 Aqua IAM #20

OPTIMUM DATE

3 4

5 6 7 Aura IAM #17 8 Aqua IAM #21 9 Aura IAM #18 10 11

12 13 14 Contingency 15 Contingency 16 Contingency 17 18

19 20 21 Aqua IAM #22 22 Aura IAM #19 23 Aqua IAM #23 24 25

26 27 28 Aura IAM #20 29 Aqua IAM #24 30 Aura IAM #21 1 May 2

3 4 5 Back Up IAM 6 Back Up IAM 7 Back Up IAM 8 9


Maneuver Locations


0

25

50

75

100

125

150

175

200

225

250

Date

Fu

el R

emai

nin

g (

kg)

Definitive Fuel Use Predicted Fuel Use

Aura Fuel Usage: (Actual & Predicted)

Fall 2006 Delta-i

Maneuvers

Fall 2004 Delta-i

Maneuvers

Spring 2007 Delta-i

Maneuvers

Spring 2009 Delta-i

Maneuvers

Annual Delta-i

Maneuvers

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MOWG Focus

GOAL: Continued operation of the spacecraft and instruments as they age

• Understanding the current state of the instruments regarding any changes that may affect performance or data products

• How to adjust operations in order to prolong instrument life and science mission

• Understanding what are the various conditions that can cause an instrument to go to an “undesirable” state and implementing procedures to avoid them

• Mutual understanding/detailed procedures between the FOT and IOT on how to deal with critical situations, i.e., red flags

• Projected lifetime of the instrument based on current state


Summary• Spacecraft Status - GREEN• Instrument Status - GREEN

– HIRDLS: Reduced Aperture; chopper recovery in progress» Chopper began exhibiting anomalous behavior in November 2006

– Chopper Stalled March 17, 2008 (unable to re-start to date)– 9/10/08: Initiated auto re-start Macro ~ 288 restart attempts/day

– MLS: Operating Normally » Band 13 measurements suspended February 2006» THz Band 17 currently out of lock

– OMI: Operating Normally » Two (2) Field-of-View Row Anomalies (September 2007 & May 2008)

– TES: Operating Normally» August 2008: Modified Global Survey Observations to extend ICS lifetime» Implemented new Lubrication Macro to extend ICS lifetime

• Data Capture/L0 Processing Status – GREEN– SSR Data Capture to 09/30/2008: 99.9910 %*

• Ground Systems – Continuing ground system upgrade and technology refresh

• Preparing for Senior Review in 2009 (First time)

17GSFC

Thank you!

Questions?


Additional Charts

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19GSFC

Aura’s Neighborhood(705 km Orbit)

20GSFC

Earth Science Morning Constellation

• SAC-C is staying 2 km above Landsat-7 & Terra

Mission MLT

Terra 10:30:03

EO-1 09:59:56

Landsat-7 10:01:03

SAC-C 08:14:41 Original Morning Constellation configurationAs of October 22, 2008

• EO-1 is currently 15 km below Landsat-7 & Terra

Operating on a 2-year extension through 2009

Has enough propellant to last through 2011

• Terra and LandSat-7 are continuinng operations at 705 km.

21GSFC

Orbital Debris Avoidance

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Debris Avoidance

• On average, one object comes closeWithin 5 km of each constellation

mission each dayWithin 2 km of each constellation

mission once or twice a week.• ESMO has a task with the DOD’s

Joint Space Operations Center (JSpOC) to screen all A-Train and Morning Constellation missions to ensure their safety.

• A number of missions are in a 705 km sun-synchronous polar orbit.• 55 other objects reside in orbits with mean altitudes of 705 +/- 5 km,

including, A-Train missions, Terra, EO-1, Landsat-5 and -7, and six Iridium satellites.

• More than 1500 cataloged objects pass through this regime each day.

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• Aura performed a 2-second burn on June 26, 2008 to avoid a piece of well-tracked debris from a U.S. satellite.

• CloudSat performed two small maneuvers on July 20 and 22, 2008 to avoid debris from a Delta I LV.

• PARASOL performed an early drag make-up maneuver on October 20, 2008 to avoid a space object.

• PARASOL is planning a possible avoidance maneuver on October 27

• Terra is evaluating a debris avoidance maneuver this week

Debris Avoidance Maneuvers During June 2007 – July 2008


Spacecraft Anomalies

• Command & Data Handling (C&DH) Subsystem Formatter Multiplexer Unit/Solid State Recorder (FMU/SSR) Anomaly– Started December 4, 2007:

» Entered “quiet period” two-weeks later (12/18/07)

» Occasional packet errors are still observed at pre-anomaly levels

– No interruption to spacecraft or instrument operations– ESMO Anomaly Resolution Team Formed

» NGST, AETD, FOT, MD

– GSFC/AETD/NGST Anomaly Review Board Final Report» Most Likely Cause: Single Event Functional Interrupt (SEFI)» Continue to operate as is unless anomaly returns

– FOT prepared to perform FMU/SSR Reset Procedures and/or C&DH Swap Procedures if necessary

– No impact to operations or 6-year life expectancy


Updated Lifetime Estimate(September 2008)

• Long-term orbit simulations were run for Aqua and Aura through 2017– Used mean nominal Schatten solar flux predictions

– Estimated the frequency of drag make-up maneuvers to maintain Aqua’s WRS-2 ground track requirements

– Estimated the required number of annual inclination maneuvers for Aqua and Aura to satisfy the OMI beta angle request and maintain Aqua’s mean local time (MLT) requirement

– Did not include potential debris avoidance maneuvers

• Lifetime predictions for Aqua and Aura show that both spacecraft will have sufficient fuel to maintain their current orbits within the Afternoon Constellation through 2016 and possibly well beyond

• Further analyses will be performed by ESMO FD Team


Debris Assessment Software

• The Debris Assessment Software (DAS) was created by the Orbital Debris Office in Johnson Space Center and is the Agency standard for end of mission life analyses and lifetime estimations

• DAS requires several inputs from a user describing a spacecraft’s mission:

– The operational orbit parameters– The mission launch date– Length of a mission’s lifetime

• In turn, DAS outputs:– Whether this mission is compliant with NASA requirements for limiting

orbital debris– A recommended apogee and perigee that will allow the spacecraft to

reenter within a specific period and satisfy NASA requirements

• Aqua and Aura will have enough fuel onboard to safely exit the constellation and deorbit to the DAS recommended apogees and perigees


Aura DAS Lifetime Estimate(September 2008)

Aura

0.0

20.0

40.0

60.0

80.0

100.0

120.0

140.0

160.0

20

08

20

10

20

12

20

14

20

16

20

18

20

20

20

22

20

24

20

26

Date

Fu

el

Ma

ss

(k

g)

Fuel needed to reach DAS perigee Estimated remainging fuel


0

25

50

75

100

125

150

175

200

225

Oct, 2006 Apr, 2012 Sep, 2017 Mar, 2023 Sep, 2028 Feb, 2034 Aug, 2039 Feb, 2045

Date

F10

.7 S

ola

r F

lux

Va

lue

Schatten Mean Schatten Mean +2 Sigma Schatten Mean -2 Sigma DAS 2.0.1

Schatten & DAS 2.0.1 Solar Flux Predictions – Nominal Timing

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Data Capture


Data Capture

99.5%

99.6%

99.7%

99.8%

99.9%

100.0%

Jun-04 Sep-04 Jan-05 May-05 Sep-05 Jan-06 May-06 Sep-06 Jan-07 May-07 Sep-07 Jan-08 May-08 Sep-08Month-Year

Da

ta C

ap

ture

Ra

te

Monthly Data CaptureMission Data Capture

SSR Data Capture to 09/30/2008: 99.9910 %*

SSR AnomalyEDOS Ops

Error

Norway Comm Outages

Documents

1 EOS Aura Science Team Meeting Angie Kelly EOS Science Interface Manager Constellation Team Manager NASA Goddard Space Flight Center Greenbelt, Md. 20771