(52768) 1998 OR2

Asteroid April 2023 New Arecibo radar results presented at the 8th IAA Planetary Defense Conference in April 2023 an subsequent publication September 2020 yes (52768) 1998 OR 2 #FFC2E0 1998 OR2 Arecibo.png Arecibo Observatory radar image of 1998 OR 2 with a crater on 18 April 2020 NEAT Haleakala Obs. 24 July 1998 (52768) 1998 OR 2 AmorNEOPHA 25 February 2023 (JD 2460000.5 ) 0 35.49 yr (12,963 days) 30 June 1987 (Siding Spring Obs.) 3.750 AU 1.011 AU 2.380 AU 0.5754 3.67 yr (1,342 days) 280.159° 0.2683561 ms / day 5.878° 26.942° 174.580° 0.00866 AU LD on 6 2.08 x 1.93 x 1.60 km(± 0.10 x 0.10 x 0.03 km) 1.78 0.10 km 10.67 km2 3.0 0.5 km3 3.2 0.2 g/cm3 4.10872 0.00001 h 20.7 5 ° 332.3 5 ° 69.3 5 ° (wrt ecliptic)pole 1998 OR 2's rotational north pole direction is given in terms of ecliptic coordinates, where λ is ecliptic longitude and β is ecliptic latitude.6 β is the angular offset from the ecliptic plane, whereas inclination i with respect to the ecliptic is the angular offset of the asteroid's rotational north pole from the ecliptic north pole at β +90° ; i with respect to the ecliptic would be the complement of β. Therefore, given β +20.7° , i 90° – (+20.7°) 69.3° from the ecliptic. 0.15 Xn or S 15.72 0.0216.04 (52768) 1998 OR 2 is an asteroid on an eccentric orbit, classified as a near-Earth object and potentially hazardous asteroid of the Amor group, with a diameter of 2 km mi us. It was discovered on 24 July 1998, by astronomers of the Near-Earth Asteroid Tracking (NEAT) program at the Haleakala Observatory, Hawaii. It passed very near to Earth on 29 April 2020 at around 4:15am. It is one of the brightest and therefore largest potentially hazardous asteroids known to exist. With an observation arc of 37.27 years (13612 days), the asteroid has a well-determined orbit, and its trajectory is well known through the year 2197. The asteroid's orbit is only potentially hazardous on a time scale of thousands of years. Orbit and classification 1 left vertical 200 Asteroid 52768 (1998 OR2) 09.04.2020.gif Time lapse of asteroid 1998 OR 2's motion in the sky on 9 April 2020 52768 1998 OR2.jpg Orbit diagram of 1998 OR 2 1998OR2 apr19 mosaic.png Arecibo radar images of 1998 OR 2 taken over a two-hour period in April 2020 Animation of 1998 OR2 close approach in 2020.gif Animation of 1998 OR2 close approach in 2020 1998 OR 2 is a member of the dynamical Amor group of near-Earth asteroids, and therefore does not currently cross Earth's orbit. The asteroid's closest approach to the Sun is just outside Earth's farthest distance from the Sun. When the asteroid has a perihelion point less than 1.017 AU (Earth's aphelion), it is classified an Apollo asteroid. This asteroid's category flips back and forth as time passes, due to minor perturbations of its orbit. It orbits the Sun at a distance of 1.0–3.7 AU once every 3 years and 8 months (1,344 days; semi-major axis of 2.38 AU). Its orbit has a high eccentricity of 0.57 and an inclination of ° with respect to the ecliptic. With its sufficiently large aphelion, this asteroid is also classified as a Mars-crosser, crossing the orbit of Mars at 1.66 AU. The body's observation arc begins with a precovery published by the Digitized Sky Survey taken at the Siding Spring Observatory in June 1986, more than 12 years prior to its official discovery observation at Haleakala Observatory, Hawaii. Close approaches With an absolute magnitude of approximately 15.8, 1998 OR 2 is one of the brightest and presumably largest-known potentially hazardous asteroids (see PHA-list). It currently has an Earth minimum orbital intersection distance of 0.0087 AU km on off 3, which translates into 3.4 lunar distances (LD). On 16 April 2079, this asteroid will make a near-Earth encounter at a safe distance of 0.0118 AU LD 3 on, and pass the Moon at 0.0092 AU LD 2 on. The asteroid's orbit is only potentially hazardous on a time scale of hundreds, if not thousands, of years. On 29 April 2020 at 09:56 UTC, the asteroid passed at a distance of 0.042 AU e6km LD 2 unit on from Earth. With observations as recent as April 2020 and a 32-year observation arc, the 2020 close approach distance was known with an accuracy of roughly ±6 km.https://archive.today/20200429151604/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1998OR2;cad=1 JPL #277 (solution date: 2020-Apr-29) (MaxDist of 0.0420485754979265) – (MinDist of 0.0420484977243086) * 149597870.7 = 12 km (For comparison, Venus will be 0.29 AU e6km LD 2 unit on or from Earth on 3 June 2020.) left Physical characteristics left|thumb|upright|Animation of radar images showing 1998 OR 2's rotation According to observations by the NASA IRTF telescope during the ExploreNEOs Warm Spitzer program, 1998 OR 2 is a rather rare L-type asteroid. Delay-Doppler radar observations by the Arecibo Observatory in April 2020 have shown that 1998 OR 2 bears a large, crater-like concavity in its shape. These radar observations have also resolved several other topographic features on the asteroid's surface, such as hills and ridges. Rotation period In 2009, rotational lightcurves of 1998 OR 2 were obtained from photometric observations by astronomers in Salvador, Brazil, and during the Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS). Lightcurve analysis gave a rotation period of 3.198 and 4.112 hours with a brightness amplitude of 0.29 and 0.16 magnitude, respectively (U=2/2+). The latter rotation period of 4.1 hours was later confirmed by radar observations of the asteroid in 2020. Diameter and albedo The Collaborative Asteroid Lightcurve Link (CALL) assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 2.15 km mi based on an absolute magnitude of 15.7. It is the first near-Earth asteroid to show evidence of shock darkening: the slow darkening of the surface over time, from micrometeorites and solar wind. Naming As of 2023, this minor planet has not been named. Notes References 30em 2022-12-26 last obs. Small-Body Database Lookup: 52768 (1998 OR2) https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=52768&view=OPDCA Jet Propulsion Laboratory 5 April 2023 52768 (1998 OR2) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=52768 7 March 2020 List of the Potentially Hazardous Asteroids (PHAs) Minor Planet Center https://www.minorplanetcenter.net/iau/lists/t_phas.html 24 January 2018 52768 7 March 2020 Coordinate transformations https://aas.aanda.org/articles/aas/full/1998/01/ds1449/node3.html Astronomy and Astrophysics European Southern Observatory January 1998 5 April 2023 17 June 2021 https://web.archive.org/web/20210617050235/https://aas.aanda.org/articles/aas/full/1998/01/ds1449/node3.html live 6 Bruce W. Koehn Edward G. Bowell Brian A. Skiff Jason J. Sanborn Kyle P. McLelland Petr Pravec Brian D. Warner October 2014 Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS) - 2009 January through 2009 June The Minor Planet Bulletin 41 4 286–300 1052-8091 2014MPBu...41..286K Alberto Silva Betzler Alberto Brum Novaes October 2009 Photometric Observations of 1998 OR2, 1999 AQ10, and 2008 TC3 The Minor Planet Bulletin 36 4 145–147 1052-8091 2009MPBu...36..145B Cristina A. Thomas Joshua P. Emery David E. Trilling Marco Delbó Joseph L. Hora Michael Mueller January 2014 Physical characterization of Warm Spitzer-observed near-Earth objects Icarus 228 217–246 2014Icar..228..217T 10.1016/j.icarus.2013.10.004 1310.2000 119278697 Arecibo Continues Operations through Pandemic to Observe Potentially Hazardous Asteroid 1998 OR2 http://www.naic.edu/~pradar/press/1998OR2.php A. K. Virkki Planetary Radar Science Group NAIC-Arecibo Observatory 23 April 2020 23 April 2020 2 May 2020 https://web.archive.org/web/20200502063652/http://www.naic.edu/~pradar/press/1998OR2.php dead Asteroid Visiting Earth's Neighborhood Brings its Own Face Mask https://www.ucf.edu/news/asteroid-visiting-earths-neighborhood-brings-its-own-face-mask/ Zenaida Gonzalez Kotala UCF Today University of Central Florida 23 April 2020 23 April 2020 1998OR2 MOID over the next 2700 years – Peter Thomas Marek Husárik Oleksandra Ivanova Photometric results of two PHAs: (52768) 1998 OR2 and (99942) Apophis September 2021 16th Europlanet Science Congress 2022 Europlanet Society 16 EPSC2022-671 Granada, Spain 10.5194/epsc2022-671 2022EPSC...16..671H free Adam Battle Vishnu Reddy Juan A. Sanchez Benjamin Sharkey Neil Pearson Bryn Bowen Physical Characterization of Near-Earth Asteroid (52768) 1998 OR2: Evidence of Shock Darkening/Impact Melt The Planetary Science Journal September 2022 3 9 226 free 10.3847/PSJ/ac7223 2210.03049 2022PSJ.....3..226B etal Maxime Devogèle (52768) 1998 OR2, an analog to (16) Psyche in the near-Earth space? https://az659834.vo.msecnd.net/eventsairwesteuprod/production-atpi-public/e074728cee8b449aba50cfe4962792a0 8th IAA Planetary Defense Conference Vienna, Austria 5 April 2023 9 https://web.archive.org/web/20230405225714/https://az659834.vo.msecnd.net/eventsairwesteuprod/production-atpi-public/e074728cee8b449aba50cfe4962792a0 5 April 2023 live Devogèle Maxime McGilvray Anna MacLennan Eric Monchinski Courteney Marshall Sean E. Hickson Dylan Virkki Anne Giorgini Jon D. Abe Lyu Augustin David Aznar-Macías Amadeo Baudouin Philippe Behrend Raoul Bendjoya Philippe Benkhaldoun Zouhair Bosch Josep Cellino Alberto Chatelain Joseph Deldem Marc Ferrais Marin Goncalves Rui Houdin Gerard Husárik Marek Jehin Emmanuel Kareta Teddy Kim Myung-Jin Licandro Javier Lister Tim Medeiros Hissa Pravec Petr Rivet Jean-Pierre Rousseau Gerald Roh Dong-Goo Skiff Brian Taylor Patrick A. Venditti Flaviane Vernet David Vienney Jean-Michel Yim Hong-Suh Zambrano-Marin Luisa Surface Heterogeneity, Physical, and Shape Model of Near-Earth Asteroid (52768) 1998 OR2 The Planetary Science Journal 1 February 2024 5 2 44 10.3847/PSJ/ad1f70 free 2024PSJ.....5...44D 10138/575122 free External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend 52768 52768 1998OR2 2052768 52767 Ophelestes 52768 052768 052768 052768 19980724 20200429 052768 052768