(89959) 2002 NT7

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(89959) 2002 NT7
Discovery [1]
Discovered by LINEAR
Discovery site Lincoln Lab's ETS
Discovery date 9 July 2002
Designations
MPC designation (89959) 2002 NT7
2002 NT7
Apollo · NEO · PHA[1][2]
Orbital characteristics[1]
Epoch 23 March 2018 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 62.68 yr (22,894 days)
Aphelion 2.6529 AU
Perihelion 0.8180 AU
1.7355 AU
Eccentricity 0.5286
2.29 yr (835 days)
79.375°
0° 25m 51.96s / day
Inclination 42.333°
132.08°
300.67°
Earth MOID 0.0004 AU
Physical characteristics
Dimensions 1.407±0.085 km[3]
Albedo 0.224±0.053[3]
16.4[1]

(89959) 2002 NT7, provisional designation 2002 NT7, is a kilometer-sized asteroid on an eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.2 kilometers in diameter.[1][2]

Description[edit]

2002 NT7 became the first object observed by NASA's NEO program to be assigned a positive rating on both the Torino Scale and the Palermo Technical Impact Hazard Scale, for a small chance of an impact on February 1, 2019. It was discovered on 9 July 2002, by the Lincoln Near-Earth Asteroid Research team (LINEAR) at the U.S. Lincoln Laboratory Experimental Test Site near Socorro, New Mexico.[2]

Despite inflammatory press reports, the object had a "low probability" of impact. Initial observations gave it a 1 in 100,000 chance of hitting Earth, 99.999% chance it misses, with a Palermo rating of 0.06[4]. By 24th July, computer models based on 15 days of observation from 9th July, made it a 1 in 250,000 chance of a hit, i.e. a 99.9996% chance of a miss[5], with a margin of error of tens of millions of miles[6]. A new observation on 28th July reduced the probability to 1 in 40 million[5], though it still had a small chance of a hit in 2060[5].

2002 NT7 was removed from the Sentry Risk Table on August 1, 2002 so there is no risk of an impact by it in the next 100 years.[7] It is now known that on January 13, 2019 the asteroid will safely pass 0.4078 AU (61,010,000 km; 37,910,000 mi) from the Earth.[8]

However, the discovery of an object with an initial Palermo hazard rating of 0.06[9] was a historical event for the NEO observation program.

On January 30, 2020 the asteroid will pass 0.02718 AU (4,066,000 km; 2,527,000 mi) from 2 Pallas.[10]

Numbering and naming[edit]

As of 2018, it has not been named [[List of named minor Planets(alphabetical)|named]].[2]

References[edit]

  1. ^ a b c d e "JPL Small-Body Database Browser: 89959 (2002 NT7)" (2017-03-15 last obs.). Jet Propulsion Laboratory. Retrieved 26 April 2017. 
  2. ^ a b c d "89959 (2002 NT7)". Minor Planet Center. Retrieved 26 April 2017. 
  3. ^ a b Mainzer, A.; Grav, T.; Bauer, J.; Masiero, J.; McMillan, R. S.; Cutri, R. M.; et al. (December 2011). "NEOWISE Observations of Near-Earth Objects: Preliminary Results". The Astrophysical Journal. 743 (2): 17. arXiv:1109.6400Freely accessible. Bibcode:2011ApJ...743..156M. doi:10.1088/0004-637X/743/2/156. Retrieved 26 April 2017. 
  4. ^ Asteroid rating system makes an impact on the media. Knight, J., Nature, 2002.
  5. ^ a b c 2019 asteroid given all clear, Jeff Hecht, New Scientist, 30 July 2002
  6. ^ Nasa dismisses asteroid collision claim Simon Jeffery, The Guardian, 24 Jul 2002
  7. ^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Retrieved 2011-05-06. 
  8. ^ "JPL Close-Approach Data: 89959 (2002 NT7)" (last observation: 2011-09-12; arc: 57 years). Retrieved 2011-11-04. 
  9. ^ "Space rock 'on collision course'". BBC News. 24 July 2002. Retrieved 2007-12-28. 
  10. ^ "NEODyS-2 Close Approaches for (89959) 2002NT7". Near Earth Objects - Dynamic Site. Retrieved 2011-11-05. 

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External links[edit]