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Dear GLIMS colleagues, </div>
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Here is some news about our old workhorse, Terra ASTER. It is reaching toward end of life, but it will not go quickly (unless it does). The end of life plan has some changes that will make the data different than many of you are used to.</div>
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Cheers,</div>
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Jeff Kargel</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Abrams, Michael J (US 329A) <mjabrams@jpl.nasa.gov><br>
<b>Sent:</b> Thursday, February 18, 2021 4:49 PM<br>
<b>To:</b> arg3@u.washington.edu <arg3@u.washington.edu>; Davies, Ashley G (US 3223) <ashley.g.davies@jpl.nasa.gov>; Eng, Bjorn T (US 398A) <bjorn.t.eng@jpl.nasa.gov>; braup@nsidc.org <braup@nsidc.org>; Geller, Gary N (US 398P) <gary.n.geller@jpl.nasa.gov>;
Hulley, Glynn C (US 329G) <glynn.hulley@jpl.nasa.gov>; Tan, Howard L (US 329A) <howard.l.tan@jpl.nasa.gov>; jeffrey.g.masek@nasa.gov <jeffrey.g.masek@nasa.gov>; jmars@usgs.gov <jmars@usgs.gov>; kargel@hwr.arizona.edu <kargel@hwr.arizona.edu>; Maldonado, Leon
(US 329A) <leon.maldonado.jr@jpl.nasa.gov>; lprashad@asu.edu <lprashad@asu.edu>; matt.watson@bristol.ac.uk <matt.watson@bristol.ac.uk>; MickieGrace@LookoutRanch.com <MickieGrace@LookoutRanch.com>; Abrams, Michael J (US 329A) <mjabrams@jpl.nasa.gov>; mp337@cornell.edu
<mp337@cornell.edu>; mramsey@pitt.edu <mramsey@pitt.edu>; rwessels@usgs.gov <rwessels@usgs.gov>; Hook, Simon J (US 3200) <simon.j.hook@jpl.nasa.gov>; Realmuto, Vincent J (US 329A) <vincent.j.realmuto@jpl.nasa.gov>; Carsten.Laukamp@csiro.au <Carsten.Laukamp@csiro.au>;
ian.p.crum@nasa.gov <ian.p.crum@nasa.gov>; drew.h.kittel@nasa.gov <drew.h.kittel@nasa.gov>; kurtis.thome@nasa.gov <kurtis.thome@nasa.gov>; Jason.T.Hendrickson@nasa.gov <Jason.T.Hendrickson@nasa.gov>; dimitrios.c.mantziaras@nasa.gov <dimitrios.c.mantziaras@nasa.gov>;
kd.sd.us@gmail.com <kd.sd.us@gmail.com>; ctorbert@usgs.gov <ctorbert@usgs.gov>; tmaiersperger@usgs.gov <tmaiersperger@usgs.gov>; wright@higp.hawaii.edu <wright@higp.hawaii.edu><br>
<b>Subject:</b> [EXT]terra update</font>
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<p style="text-align:center"><font color="red"><strong>External Email</strong><br>
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<p align="center" style="text-align:center"><b><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:black">January 29, 2021</span></b><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:black"></span></p>
<p align="center" style="text-align:center"><b><span style="font-size:13.5pt; font-family:"Times New Roman",serif; color:red">Upcoming Terra Constellation Exit</span></b><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:black"></span></p>
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<span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:black">Terra has completed all mission maneuvers related to maintaining a 10:30 mean local time (MLT) equator crossing and 705 km orbit altitude. Terra will begin drifting to an earlier MLT
around April 2021. In October 2022, Terra will have a 10:15 AM MLT crossing, and continue to drift to earlier MLT. At this time, we will also lower our orbit altitude to 694 km. After constellation exit, ASTER science observations will continue in concert
with the changing MLT. The major effect will be that the ASTER surface sampling pattern will no longer be repeating every 16 days. However, sample locations will be reported with the data in the same format as current data. The ASTER single pixel footprint
size will decrease about 1% with the lower orbit altitude. We do not expect these orbit changes to have significant impacts to ASTER data quality. The mission is officially planned to end in September 2023. For more information, click on the link to <a href="https://terra.nasa.gov/about/terra-orbital-drift"><span style="color:#FF3300">Terra
website.</span></a></span></p>
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Michael Abrams</p>
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ASTER Team Leader</p>
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NASA/Jet Propulsion Laboratory</p>
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4800 Oak Grove Dr.</p>
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Pasadena CA 91109</p>
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818-354-0937</p>
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626-375-5922 (mobile)</p>
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mjabrams@jpl.nasa.gov</p>
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