2013 TX68

Apollo asteroid and near-Earth object February 2018 yes #FFC2E0 2013 TX 68 Catalina Sky Survey (703) 6 October 2013 NEO Apollo Venus-crossing asteroid Mars-crossing asteroid 5 October 2013 (JD 2456570.5) 8 10 days(last seen 2013) 1.6587 AU Gm on 0.74447 AU Gm on 2.5730 AU Gm on on 0.55118 1.1092° 165.741° 286.977° 1.70448E-5 AU km on 0.43841 0.03407 AU 0.00715 2.14 yr (780.31 d) 334.34° 21-52 meters (69–171 ft) 25.2 0.46135 ms / day 2.66285 AU Gm on 2013 TX 68 is an Apollo asteroid and near-Earth object discovered on 6 October 2013 by the Catalina Sky Survey, during which it was near a close approach of 5.4 Lunar distances (LD) from the Earth.The time of closest approach for the 2013 pass is known with an accuracy of better than 1 minute. CA2013 lower-alpha The asteroid only has a 10-day observation arc which makes long-term predictions of its position less certain. It was observed for three days as it approached Earth in the night sky starting with the sixth of October, 2013. Then it became unobservable by being between the Earth and the Sun,Small Asteroid to Pass Close to Earth March 8 then not recovered due to its small size and dimness. Precovery images by Pan-STARRS from 29 September 2013 were announced on 11 February 2016 that extended the observation arc to 10 days. It was removed from the Sentry Risk Table on 11 February 2016, so there is no risk of impact from this object for the next hundred years or more. The asteroid was last observed on 9 October 2013. 2016 approach The asteroid has a poorly constrained orbit, has not been observed since 2013, and often makes approaches to Earth. One such approach occurred sometime from 6 to 10 March 2016 with an uncertainty in the time of closest approach of ±2 days. While the nominal (best-fit) orbit suggested that it would pass 0.03 AU km mi on on from the Earth on March 8, it was calculated to pass as close as 0.0002 AU km mi on off (0.07 LD) or as far away as 0.1 AU km mi on off. There was no risk of an Earth impact in 2016. JPL's graphic representation of 2013 TX 68's orbit showed it was approaching Earth from the sunward side for an approach near the eighth of March with a chance of being detected by telescopes as it flew by. It was not expected to be more than 100 degrees from the Sun until March 9 and was expected to have an apparent magnitude of roughly 20.3. The asteroid was not recovered during the 2016 approach. During the March 2016 passage the uncertainty region for the asteroid covered as much as a 45 degree region of the sky. Possible impacts 2013 TX 68 was listed on the Sentry Risk Table. The asteroid is 21–52 meters (69–171 ft) across, making it approximately twice as large as the Chelyabinsk meteor. However, it is not listed as a potentially hazardous asteroid because it is less than 100 meters (330 ft) in diameter. With an insignificant 1-day observation arc, it was listed on the Sentry Risk Table with a 1 in 20 million chance it could impact Earth on 5 March 2016, but that threat was quickly ruled out. With a short 3-day observation arc, it was listed on the Sentry Risk Table with a 1 in 300 million chance it could impact Earth on 28 September 2017. The nominal (best-fit) solution shows that 2013 TX 68 should be around 1.5 AU from Earth on 28 September 2017. It was removed from the Sentry Risk Table on 11 February 2016 when precovery images gave it a 10-day observation arc. If it were ever to impact Earth, it would likely create a large fireball in the sky and possibly an impact crater 100–575 meters (328–1,886 ft) across, assuming an impact angle of less than 45 degrees. See also 2009 RR List of asteroid close approaches to Earth in 2016 Notes References MPEC 2013-T64 : 2013 TX68 IAU Minor Planet Center 2013-10-07 http://minorplanetcenter.net/mpec/K13/K13T64.html 2016-02-12 (K13T68X) MPEC 2016-C131: DAILY ORBIT UPDATE (2016 FEB. 11 UT) IAU Minor Planet Center 2016-02-11 http://www.minorplanetcenter.net/mpec/K16/K16CD1.html 2016-02-12 last observation: 2013-10-09; arc: 10 days JPL Small-Body Database Browser: (2013 TX68) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2013TX68;cad=1 Jet Propulsion Laboratory 4 April 2016 2013 TX68 Impact Risk (3 day arc) http://neo.jpl.nasa.gov/risk/2013tx68.html Wayback Machine: Jet Propulsion Laboratory 1 January 2016 dead https://web.archive.org/web/20140403145035/http://neo.jpl.nasa.gov/risk/2013tx68.html 3 April 2014 2013 TX68 Impact Risk (1 day arc) 2013-10-09 http://neo.jpl.nasa.gov/risk/2013tx68.html Wayback Machine: Jet Propulsion Laboratory 2016-02-13 dead https://web.archive.org/web/20131009045306/http://neo.jpl.nasa.gov/risk/2013tx68.html 9 October 2013 2013TX68 Ephemerides for 28 September 2017 NEODyS (Near Earth Objects Dynamic Site) https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=2013TX68&oc=500&y0=2017&m0=9&d0=26&h0=0&mi0=0&y1=2017&m1=10&d1=1&h1=0&mi1=0&ti=1.0&tiu=days 2016-02-06 2013TX68 Ephemerides for 1–20 March 2016 NEODyS (Near Earth Objects Dynamic Site) http://newton.dm.unipi.it/neodys/index.php?pc=1.1.3.1&n=2013TX68&oc=500&y0=2016&m0=3&d0=1&h0=0&mi0=0&y1=2016&m1=3&d1=20&h1=0&mi1=0&ti=1.0&tiu=days 2016-03-08 live https://web.archive.org/web/20160313085853/http://newton.dm.unipi.it/neodys/index.php?pc=1.1.3.1&n=2013TX68&oc=500&y0=2016&m0=3&d0=1&h0=0&mi0=0&y1=2016&m1=3&d1=20&h1=0&mi1=0&ti=1.0&tiu=days 13 March 2016 Date/Time Removed NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/removed.html https://web.archive.org/web/20020602101400/http://neo.jpl.nasa.gov/risk/removed.html dead 2002-06-02 2016-02-12 Asteroid 2013 TX68 and Slooh Asteroid Day Don Yeomans 2016-03-17 http://resources.asteroidday.org/resources/2013-tx68-and-slooh/ 2016-03-21 October 2026 InternetArchiveBot External links 2013+TX68 2013TX68 3648983 # Category:Minor planet object articles (unnumbered) # 20160305 20131006