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- 1997_XR2 abstract "1997 XR2 (also written 1997 XR2) is an asteroid discovered on December 4, 1997. It has a diameter of 0.1-0.3 km and an estimated mass on the order of 1010 kilograms.From early 2002 to February 24, 2006, 1997 XR2 was considered to have about a 1 in 10,000 chance of colliding with Earth on June 1, 2101, based on a 27 day observation arc in December 1997.It was ranked a one on the Torino Scale of impact risk, and was the only near-Earth object to be ranked higher than zero (the scale is 0–10) until it was joined by 2004 VD17 at level one in November 2004, and then when 99942 Apophis (then known only by its provisional designation 2004 MN4) was temporarily assessed at level four in December 2004. 2004 VD17 and 99942 Apophis are now rated at level zero.On February 24, 2006, 1997 XR2 was observed by the Mt. Lemmon Survey after being lost for more than 8 years. The refinement of its orbit eliminated the possibility of impact in 2101. It is now known that on November 20, 2101, the asteroid will be 0.0392 AU (5,860,000 km; 3,640,000 mi) from Earth.".
- 1997_XR2 wikiPageExternalLink news.
- 1997_XR2 wikiPageID "574184".
- 1997_XR2 wikiPageRevisionID "571916500".
- 1997_XR2 hasPhotoCollection 1997_XR2.
- 1997_XR2 subject Category:Apollo_asteroids.
- 1997_XR2 subject Category:Astronomical_objects_discovered_in_1997.
- 1997_XR2 subject Category:Removed_from_Sentry_Risk_Table.
- 1997_XR2 comment "1997 XR2 (also written 1997 XR2) is an asteroid discovered on December 4, 1997.".
- 1997_XR2 label "1997 XR2".
- 1997_XR2 label "1997 XR2".
- 1997_XR2 label "1997 XR2".
- 1997_XR2 label "1997 XR2".
- 1997_XR2 sameAs 1997_XR2.
- 1997_XR2 sameAs 1997_XR2.
- 1997_XR2 sameAs 1997_XR2.
- 1997_XR2 sameAs m.02rj7n.
- 1997_XR2 sameAs Q307089.
- 1997_XR2 sameAs Q307089.
- 1997_XR2 wasDerivedFrom 1997_XR2?oldid=571916500.
- 1997_XR2 isPrimaryTopicOf 1997_XR2.