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Astromaterials Newsletter – Volume 1 No. 1 March 2019

Stardust News

Mike Zolensky, Stardust Curator

In order to make Stardust cometary grains available to researchers at a faster rate, and to spur new research into the origin and nature of comet Wild2, we have decided to remove all remaining cells from the cometary tray (about half remain in the tray at this time), and to begin harvesting larger comet coma grain tracks from these cells. Until now we have withheld the largest tracks from analyses. Over the past several months we have removed the following five cells from the cometary tray:
• C2068,0  • C2072,0  • C2051,0  • C2001,0  • C2131,0
We have begun track removal (keystoning) with cell C2068, which has some of these larger tracks, and to date have harvested eleven new tracks. These new tracks and new tracks announced within forthcoming issues of the Astromaterials Newsletter will be subject to the 8-week "cooling off" period before sample requests will be considered, in line with the new JSC Curation science policy memo #42 outlined in the Astromaterials News section of this volume:
Keystones Created
• C2068,1,210,0,0
• C2068,5,214,0,0
• C2068,9,218,0,0
• C2068,2,211,0,0
• C2068,6,215,0,0
• C2068,10,219,0,0
 • C2068,3,212,0,0
 • C2068,7,216,0,0
 • C2068,11,220,0,0
• C2068,4,213,0,0
• C2068,8,217,0,0
These tracks are all documented in the on-line Stardust Sample Catalog, at:
https://curator.jsc.nasa.gov/stardust/catalog/cell_results_list.cfm?tab=cometary&sampletype=cell
If you go to the entry in the catalog for cell C2068 you can follow the links to images for the newly harvested tracks. These samples are now available for allocation in whole or in part.

Figure 1: Image of Stardust sample C2068,4,213,0,0.
Figure 1: Image of sample C2068,4,213,0,0.

Figure 2: Image of Stardust sample C2068,4,213,0,0.
Figure 2: Image of sample C2068,4,213,0,0.

Figure 3: Image of Stardust sample C2068,8,217,0,0.
Figure 3: Image of sample C2068,8,217,0,0.
Figure 4: Image of Stardust sample C2068,8,217,0,0.
Figure 4: Image of sample C2068,8,217,0,0.
Figure 5: Multiple images of Stardust sample C2068,11,220,0,0. 
										This is a very large keystone with numerous,fabulous terminal grains.
Figure 5: Multiple images of sample C2068,11,220,0,0. This is a very large keystone with numerous, fabulous terminal grains.