Unmanned Exploration Of Comets & Asteroids |
Unmanned Exploration Of Comets & Asteroids |
Guest_PhilCo126_* |
Jan 2 2006, 07:48 PM
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#1
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Guests |
Trying to give an overview of missions to Asteroids & comets …
Giotto ( 2 July 1985 to comet HALLEY in 1986 and to comet Grigg-Skjellerup in 1992 ) NEAR Shoemaeker ( 17 February 1996 to asteroid 433 Eros in February 2001 ) Deep Space 1 ( 15 October 1998 to comet BORELLY in September 2001 ) StarDust ( 07 February 1999 to comet WILD-2 in January 2004 ) Contour ( July 2002 to comet ENCKE … mission failure ) Deep Impact ( 12 January 2005 to comet TEMPLE-1 in July 2005 ) Which missions did I forget ? … … … |
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Jun 26 2021, 06:46 PM
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#2
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Member Group: Members Posts: 447 Joined: 1-July 05 From: New York City Member No.: 424 |
QUOTE Incoming Visitor From the Oort Cloud Could Be Among the Largest Comets Ever Documented The newly detected object is somewhere between 62 and 230 miles long. https://gizmodo.com/incoming-visitor-from-t...-the-1847149513 The Gizmodo article linked above contains a useful summary of the discovery of and prospects for 2014 UN271, with interesting comments from several astronomers. There is also a link to several tweets from Dr. Pedro Bernardinelli @phbernardinelli, a PhD candidate in physics & astronomy at the University of Pennsylvania who led the discovery project, a search for Trans Neptunian Objects using the massive data set created by the Dark Energy Survey, https://www.darkenergysurvey.org/. Dr. Bernardinelli's feed is currently full of additional information and links. Among other things, he explained something that had puzzled me, namely why an object so recently identified was assigned a 2014 designator. The discovery was the result of a computationally intense analysis of images acquired between 2014 and 2018 within a big data feed. There is no single "discovery image," and by convention they used the date of the earliest image. See https://twitter.com/Tom_Ruen/status/1406952833774145540 |
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