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NASA's Earth Observing System
MOMS

 Launch: Jun 18 1983
 

 

Nimbus 1

 Launch: Aug 28 1964
 

 

Nimbus 2

 Launch: May 15 1966
 

 

Nimbus 3

 Launch: Apr 14 1969
 

 

Nimbus 4

 Launch: Apr 8 1970
 

 

Nimbus 5

 Launch: Dec 11 1972
 

 

Nimbus 6

 Launch: Jun 12 1975
 

 

Nimbus 7

 Launch: Oct 24 1978
 

 

NOAA-POES

 Launch: Mar 28 1993
 

 

OSTM/Jason-2
(Joint with NOAA, CNES, and EUMETSAT)

 Launch: Jan 20 2008
 

Altitude:1,336km
Inclination:66.00°

 

PARASOL
(France)

 Launch: Dec 4 2004
 

Altitude:705km
Inclination:98.00°
Local Node:1:30 p.m.

 

QuikSCAT

 Launch: Jun 19 1999
 

Altitude:803km
Inclination:98.60°
Local Node:10:15 a.m.

 

RADARSAT
(Joint with Canada)

 Launch: Nov 4 1995
 

 

SeaWiFS

 Launch: Aug 1 1997
 

Altitude:705km
Inclination:98.20°
Local Node:12:00 noon

 

Seasat 1

 Launch: Jun 28 1978
 

 

SeaWinds
(Joint with Japan and France)

 Launch: Dec 14 2002
 

Altitude:803km
Inclination:98.60°

 

SRTM
(Joint with NGA, Germany, and Italy)

 Launch: Feb 11 2000
 

 

SORCE

 Launch: Jan 25 2003
 

Altitude:640km
Inclination:40.00°

 

SIR-C
(Joint with Germany and Italy)

 Launch: Apr 19 1994
 

 

SAGE-III

 Launch: Dec 10 2001
 

Altitude:1,020km
Inclination:99.50°
Local Node:9:30 a.m.

 

SMS

 Launch: May 17 1974
 

 

TIROS
(NASA)

 Launch: Apr 1 1960
 

 

TOPEX

 Launch: Aug 10 1992
 

 

TOMS-EP
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Home › Posts tagged ASTERTag: ASTERASTER News and Events

2023 Terra Updates

Posted on October 10, 2023 by Nyssa Rayne 
	Posted in News and Events 

Terra Operational Changes and Data Updates
Over the past three years, the Terra mission has performed multiple maneuvers that have led to changes in the satellite’s consistent 20+ year orbit*. Today, Terra continues slowly drifting to an increasingly earlier overpass time and lower altitude. While the orbital changes have had little to no impact on instrument data collection or quality, data users have expressed the need for regular updates on Terra’s equator crossing time (in Mean Local Time), as well as orbital altitude. Starting this month, we’ll be adding this information to the Terra homepage and updating it bi-weekly using data provided by the Flight Dynamics Team. 
Finally, processing of ASTER data has re-started, with updated Level-1processing to account for the lower Terra orbit. Processing of the previously-collected data since late October 2022 to the end of June 2023 is also taking place. See the infographic provided on the Terra website for more information, and for the latest news on all things related to Terra data, visit the Alerts and Issues page available on the LAADS DAAC website (linked here).
Terra’s Lower Orbit Virtual Community Forum (2022) | Terra
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Terra’s Lower Orbit Virtual Community Forum (2022)

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Home › About Terra › Terra’s New Orbit › Terra Orbital Maneuvers Information › Terra’s Lower Orbit Virtual Community Forum (2022)

Terra’s Lower Orbit Virtual Community Forum (2022)

This page contains information about Terra’s Lower Orbit Virtual Community Forum. You can find the presentation slide deck and a recording of the entire webinar below, separated into sections by speaker order. 

TerrasLowerOrbit_VirtualCommunityForum_120822_V6_PostForumDownload Slide Deck 

Introduction & Agenda

Terra Orbit Overview

Summary of Orbital Maneuvers

MOPITT Impacts
MODIS Impacts
MISR Impacts
CERES Impacts
ASTER Impacts

Phase F // Q & A

 

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5 Things to Know About NASA’s Tiny Twin Polar Satellites - NASA
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5 Things to Know About NASA’s Tiny Twin Polar Satellites - NASA
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Related TermsPREFIRE (Polar Radiant Energy in the Far-InfraRed Experiment)Climate ChangeEarthEarth ScienceJet Propulsion Laboratory

 

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A Message from the Project Scientist | Terra
After Terra’s IAM it began to drift to an earlier crossing time.  Drag makeup maneuvers are being continued to maintain Terra’s orbit altitude of 705 km.  Risk mitigation maneuvers will also continue to avoid orbital debris.  When Terra’s crossing time reaches a 10:15 AM MLT (currently predicted for Fall 2022), the flight operations team will have Terra exit the Earth Sciences Constellation and lower Terra to an altitude of 694 km by performing two retrograde maneuvers. Risk mitigation maneuvers continue, but no further drag make up maneuvers will take place and Terra will slowly decrease in altitude as well as continue drifting to an earlier MLT crossing.  It is predicted to reach a crossing time of 9:00 am in December 2025 at which point the perigee-lowering burns will take place to lower Terra by an additional 20 km.
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MOPITT
*Information regarding impacts to instruments is still pending.
Key Dates of Drift
Exceed 10:30 MLT (+/- 1 min) – April 2021*Exceed 10:15 MLT – Fall 2022*Constellation Exit – Fall 2022*Exceed 9:00 MLT– Winter 2025/2026*
Passivation is expected to take place due to signal to noise limits from lower solar zenith angles, limited battery power from changing solar angle on the solar panels, or programmatic funding limits. However, there has not been an official passivation date set.
*Dates are subject to change.
– Kurtis Thome, Terra Project Scientist

 

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