(35396) 1997 XF11

Asteroid of the Apollo group March 2020 yes (35396) 1997 XF 11 #FFC2E0 Spacewatch Kitt Peak National Obs. 6 December 1997 (35396) 1997 XF 11 Apollo NEO PHA 13 September 2023(JD 2453300.5) 0 33.19 yr (12,121 days) 2.139 AU e6km unit on 0.7446 AU e6km unit 26 June 2023 1.442 AU e6km unit 0.48369 1.73 yr (633 days) 4.0995° 213.65° 103.06° 44.44° 0.5688 ms / day 0.0003 AU e3km unit 0.704 0.103 km 0.940 0.480 km 1.39 km (derived) 3.252 0.002 h 3.253 0.002 h 3.2566 0.0002 h 3.25765 0.00005 h 3.259 h 3.2591 0.0025 h 0.18 (assumed) 0.29 0.21 0.7727 0.2436 SMASS Xk X 16.66 16.66 0.40 16.77 16.77 0.08 16.9 17.11 0.22 (35396) 1997 XF 11 is a kilometer-sized asteroid, classified as a near-Earth object, Mars-crosser and potentially hazardous asteroid of the Apollo group. +2028 Earth/Moon approach Date & Time Approachto Nominal distance uncertaintyregion(3-sigma)2028-Oct-26 06:44 Earth 929253 km ± 106 km2028-Oct-26 07:39 Moon 1326430 km ± 106 km Description Three months after its discovery on 6 December 1997 by James V. Scotti of the University of Arizona's Spacewatch Project, the asteroid was predicted to make an exceptionally close approach to Earth on 28 October 2028. Additional precovery observations of the asteroid from 1990 were quickly found that refined the orbit and it is now known the asteroid will pass Earth on 26 October 2028, at a distance of 929000 km LD on on. During the close approach, the asteroid should peak at about apparent magnitude 8.2, and will be visible in binoculars. 1997 XF 11 measures between 0.7 and 1.4 kilometers in diameter. This asteroid also regularly comes near the large asteroid Pallas. IAU Circular On 11 March 1998, using a three-month observation arc, a faulty International Astronomical Union circular and press information sheet were put out that incorrectly concluded "that the asteroid was 'virtually certain' to pass within 80% of the distance to the Moon and stood a 'small...not entirely out of the question' possibility of hitting the Earth in 2028." But by 23 December 1997, it was clear that 1997 XF 11 had no reasonable possibility of an Earth impact. Many news outlets mistakenly emphasized the possibility of disaster. Twenty Years of Tracking Near-Earth Objects https://www.jpl.nasa.gov/news/twenty-years-of-tracking-near-earth-objects 2024-07-23 NASA Jet Propulsion Laboratory (JPL) en-US Within hours of the announcement, independent calculations by Paul Chodas, Don Yeomans, and Karri Muinonen had calculated that the probability of Earth impact was essentially zero, and vastly less than the probability of impact from as-yet-undiscovered asteroids. Chodas (1999) concurs with Marsden (1999) that based on the 1997 data alone there was about 1 chance in a hundred thousand that 1997 XF 11 could have been on an Earth-impact trajectory—that is, until the 1990 precovery observations eliminated such possibilities. During the October 2002 close approach, the asteroid was observed by the 70-meter Goldstone radar dish, further refining the orbit. References MPEC 1997-Y11 : 1997 XF11 IAU Minor Planet Center 1997-12-23 https://www.minorplanetcenter.net/iau/mpec/J97/J97Y11.html 2012-02-08 18 August 2017 https://web.archive.org/web/20170818045155/http://www.minorplanetcenter.net/iau/mpec/J97/J97Y11.html live (J97X11F) 2023-05-29 last obs. JPL Small-Body Database Browser: 35396 (1997 XF11) https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2035396&view=OPC Jet Propulsion Laboratory 2023-09-21 2 May 2021 https://web.archive.org/web/20210502171013/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000130#/?sstr=2035396&view=OPC live Horizons Batch for 2028-10-26 Close Approach JPL Horizons https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271997+XF11%27&START_TIME=%272028-10-26%2006:44%27&STOP_TIME=%272028-10-27%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720,39%27 https://web.archive.org/web/20230112080448/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271997+XF11%27&START_TIME=%272028-10-26%2006:44%27&STOP_TIME=%272028-10-27%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720,39%27 2023-01-12 live 2023-01-12 RNG_3sigma = uncertainty range in km. 35396 (1997 XF11) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=35396 18 January 2018 18 January 2018 https://web.archive.org/web/20180118064711/https://www.minorplanetcenter.net/db_search/show_object?object_id=35396 live Sormano Astronomical Observatory: Table of Next Closest Approaches to the Earth by Asteroids Astronomical Observatory of Brera Piero Sicoli Francesco Manca http://www.brera.mi.astro.it/sormano/teca.html 2008-02-04 https://web.archive.org/web/20071201202009/http://www.brera.mi.astro.it/sormano/teca.html 1 December 2007 live NEODyS (35396) 1997XF11 Close Approaches Department of Mathematics, University of Pisa, ITALY https://newton.spacedys.com/neodys/index.php?pc=1.1.8&n=1997XF11 2008-02-04 https://web.archive.org/web/20160303182605/http://newton.dm.unipi.it/neodys/index.php?pc=1.1.8&n=1997xf11 2016-03-03 live 1997XF11 Ephemerides for 26 Oct 2028 NEODyS (Near Earth Objects Dynamic Site) https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=35396&oc=500&y0=2028&m0=10&d0=25&h0=0&mi0=0&y1=2028&m1=10&d1=28&h1=0&mi1=0&ti=1.0&tiu=hours 2011-10-16 21 April 2024 https://web.archive.org/web/20240421003609/https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=35396&oc=500&y0=2028&m0=10&d0=25&h0=0&mi0=0&y1=2028&m1=10&d1=28&h1=0&mi1=0&ti=1.0&tiu=hours live 5 April 1998 last update: 3 September 1998 The Asteroid Impact Scare of Mid-March 1998 Southwest Research Institute (SwRI) Clark R. Chapman http://www.boulder.swri.edu/clark/fx11.html 2012-02-08 24 November 2020 https://web.archive.org/web/20201124042947/https://www.boulder.swri.edu/clark/fx11.html live 19 August 1999 The AsteroidsComet Impact Hazard Southwest Research Institute (SwRI) Clark R. Chapman http://www.boulder.swri.edu/clark/ncar799.html 2012-02-09 25 November 2020 https://web.archive.org/web/20201125202042/https://www.boulder.swri.edu/clark/ncar799.html live October 31, 2002 Halloween Asteroid https://science.nasa.gov/science-news/science-at-nasa/2002/31oct_1997xf11/ 2012-02-09 29 November 2011 https://web.archive.org/web/20111129043456/http://science.nasa.gov/science-news/science-at-nasa/2002/31oct_1997xf11/ dead Asteroids and comets rotation curves (35396) Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page5cou.html#035396 18 January 2018 19 June 2015 https://web.archive.org/web/20150619010828/http://obswww.unige.ch/%7Ebehrend/page5cou.html#035396 live 35396 18 January 2018 31 August 2020 https://web.archive.org/web/20200831233109/http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=35396%7C live 6 David E. Trilling Michael Mommert Joseph Hora Steve Chesley Joshua Emery Giovanni Fazio Alan Harris Michael Mueller Howard Smith December 2016 NEOSurvey 1: Initial Results from the Warm Spitzer Exploration Science Survey of Near-Earth Object Properties The Astronomical Journal 152 6 10 2016AJ....152..172T 10.3847/0004-6256/152/6/172 1608.03673 56105212 free 6 Joseph R. Masiero C. Nugent A. K. Mainzer E. L. Wright J. M. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett October 2017 NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos The Astronomical Journal 154 4 10 2017AJ....154..168M 10.3847/1538-3881/aa89ec 1708.09504 45334910 free Stephen M. Slivan Emily C. Bowsher Bena W. Chang December 2002 Rotation period and spin direction of near-Earth asteroid (35396) 1997 XF11 The Minor Planet Bulletin 30 2 29–30 1052-8091 2003MPBu...30...29S Warner, Brian D. October 2016 Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2016 April–July The Minor Planet Bulletin 43 4 311–319 1052-8091 2016MPBu...43..311W 6 Vicente Mas Martinez Gonzalo Fornas Silva Angel Flores Martinez Alfonso Carreno Garceran Enrique Arce Mansego Pedro Brines Rodriguez Juan Lozano de Haro Alvaro Fornas Silva Onofre Rodrigo Chiner David Herrero Porta October 2016 Lightcurves for Two Near-Earth Asteroids by Asteroids Observers (OBAS) - MPPD: 2016 April–May The Minor Planet Bulletin 43 4 283–284 1052-8091 2016MPBu...43..283M Petr Pravec Alan W. Harris Peter Kusnirák Adrián Galád Kamil Hornoch September 2012 Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations Icarus 221 1 365–387 2012Icar..221..365P 10.1016/j.icarus.2012.07.026 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 Preliminary results Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 External links 1997 XF 11 at the European Asteroid Research Node (E.A.R.N) Brian Marsden: 1997 XF 11: the true story https://web.archive.org/web/20070927074124/http://www.britastro.com/jbaa/archive/marsden.htm 27 September 2007 Spacewatch animation of 1997 XF 11 https://web.archive.org/web/20071112233908/http://spacewatch.lpl.arizona.edu/1997XF11.html 12 November 2007 Asteroid 1997 XF 11 (Earth Close-Approach), JPL Near-Earth Object Program 35396 35396 1997XF11 35396 (35396) 1997 XF 11 035396 035396 035396 035396 19971206