2014 XL7

Near-Earth object and Apollo asteroid August 2021 yes 2014 XL 7 #FFC2E0 MLS Mount Lemmon Obs. 11 December 2014 2014 XL 7 Apollo NEO PHA 1 July 2021 (JD 2459396.5) 2 1.95 yr (713 d) 2.5362 AU 0.7719 AU 1.6540 AU 0.5333 2.13 yr (777 d) 80.070° 0.4633 ms / day 7.5019° 74.478° 250.76° 0.00217 AU LD on out 2 230 m ~ (est.) 170 - 380 m (est.)mean-diamter-est 25.82 21.0 2014 XL 7 is a near-Earth object and Apollo asteroid, approximately 230 m ft off 2 us in diameter. It was the most dangerous potentially hazardous asteroid on Sentry Risk Table upon its discovery by the Mount Lemmon Survey in December 2014. At the time, the asteroid had a cumulative 1 in 83000 chance of impacting Earth on 4–5 June between the years 2048 and 2084. After the object's observation arc had been extended to 35 days, it was removed from the Sentry Risk Table on 15 January 2015. Since then the asteroid's orbit has been secured. Although it has an Earth minimum orbit intersection distance of less than one lunar distance, there are no projected close encounters with Earth in the foreseeable future, with its closest passage to occur in May 2046, still millions of kilometers away. Discovery On 1 September 2014, the asteroid passed about 0.259 AU km mi on on from Earth, but remained undetected as at that time the asteroid had an apparent magnitude of 25 and was roughly 25° from the Sun. It was discovered on 11 December 2014, by the Mount Lemmon Survey at an apparent magnitude of 20 using the Steward Observatory's 1.52 m in on us reflecting telescope at Mount Lemmon Observatory near Tucson, Arizona, and received the provisional designation 2014 XL 7. Palermo Scale rating With an observation arc of only 19 days, it had a cumulative Palermo Scale rating of –2.85 and was briefly the 9th most dangerous asteroid known. It was calculated that on 4 June 2065, there was a 1 in 270,000 chance of impact and on 4 June 2076, there was a 1 in 137,000 chance of impact. On 15 January 2015, the asteroid was recovered by Cerro Paranal Observatory which extended the observation arc to 35 days, and 2014 XL 7 was subsequently removed from the Sentry Risk Table using JPL solution 9. Orbit and classification 2021, and last observed in November 2016, the asteroid has a better constrained orbit with an observation arc of 713 days and an uncertainty parameter of 2, which ranges from 0 (good) to 9 (highly uncertain). It has an apparent magnitude of 25.82, and orbits the Sun at a distance of 0.77–2.5 AU once every 2 years and 2 months (777 days; semi-major axis of 1.65 AU). Its orbit has an eccentricity of 0.53 and an inclination of 8° with respect to the ecliptic. The potentially hazardous asteroid has a minimum orbit intersection distance with Earth of 0.00217 AU km LD 3 off on, or less than the distance to the Moon. Its closest encounter with Earth will occur on 29 May 2046, at a nominal distance of 0.09275 AU km mi on on flip. With an absolute magnitude of 21, the asteroid is approximately 170 - 380 m ft off 2 us in diameter.mean-diamter-est Notes mean-diamter-est The object's average reflectivity is unknown. As near-Earth asteroids may have an albedo between 0.24 and 0.05 for objects with a relatively bright siliceous and dark carbonaceous composition, respectively, an estimated mean diameter in the range of 170 - 380 m ft off 2 us should assumed. References 2016-11-23 last obs. JPL Small-Body Database Browser: (2014 XL7) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3701883 Jet Propulsion Laboratory 7 September 2021 2014 XL7 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2014+XL7 7 September 2021 MPEC 2014-X76 : 2014 XL7 Minor Planet Electronic Circular IAU Minor Planet Center 15 December 2014 http://www.minorplanetcenter.net/mpec/K14/K14X76.html 7 September 2021 (K14X07L) last observation: 2016-11-23; arc: 713 days SBDB Close-Approach Data: (2014 XL7) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3701883;cad=1#cad Jet Propulsion Laboratory 7 September 2021 Asteroid Size Estimator CNEOS NASA/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 7 September 2021 Sentry Risk Table WayBack Machine: NASA/JPL Near-Earth Object Program Office 2014-12-31 http://neo.jpl.nasa.gov/risk/ 2015-01-01 dead https://web.archive.org/web/20141231154154/http://neo.jpl.nasa.gov/risk/ December 31, 2014 (PS=–2.85) Earth Impact Risk Summary: 2014 XL7 WayBack Machine: NASA/JPL Near-Earth Object Program Office 2014-12-31 http://neo.jpl.nasa.gov/risk/2014xl7.html 2015-01-01 dead https://web.archive.org/web/20141231153857/http://neo.jpl.nasa.gov/risk/2014xl7.html December 31, 2014 2014XL7 Ephemerides for 1 September 2014 NEODyS (Near Earth Objects Dynamic Site) http://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=2014XL7&oc=500&y0=2014&m0=9&d0=1&h0=0&mi0=0&y1=2014&m1=9&d1=2&h1=0&mi1=0&ti=1.0&tiu=days 2015-01-01 Asteroid 2014 XL7 – Ephemerides NEODyS-2, Near Earth Objects – Dynamic Site https://newton.spacedys.com//neodys/index.php?pc=1.1.3.0&n=2014XL7 7 September 2021 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 2 June 2002 7 September 2021 External links List of the Potentially Hazardous Asteroids (PHAs), Minor Planet Center List Of Apollo Minor Planets (by designation), Minor Planet Center 2014+XL7 2014XL7 3701883 # Category:Minor planet object articles (unnumbered) Category:Discoveries by MLS # # 20140901 20141211