(153591) 2001 SN263

Near-Earth asteroid October 2019 yes (153591) 2001 SN 263 #FFC2E0 2001sn263 arecibo.png Radar image of 2001 SN 263 and its two satellites imaged by the Arecibo Observatory in 2008 20 September 2001 LINEAR Lincoln Lab's ETS (153591) 2001 SN 263 NEOAmor 4 September 2017 (JD 2458000.5) 0 25.18 yr (9,198 days) 2.9368 AU 1.0363 AU 1.9865 AU 0.4783 2.80 yr (1,023 days) 148.57° 0.3520 ms / day 6.6853° 325.83° 172.86° 0.0520 AU20.3 LD 2 2 km2.5 0.3 km2.6 km2.63 0.40 km 917.5 2.2 10 kg 1.1 0.2 g/cm3 3.20 0.01 h3.423 0.001 hLCDB-Warner-20113.42510 0.00007 h3.4256 0.0002 h 0.048 0.015 CBLCDB-Perna-2014 16.8116.9 (153591) 2001 SN 263 is a carbonaceous triple asteroid, classified as a near-Earth object and former potentially hazardous asteroid of the Amor group, approximately 2.6 km mi off us in diameter. It was discovered by the Lincoln Near-Earth Asteroid Research project at Lincoln Lab's Experimental Test Site in Socorro, New Mexico, on 20 September 2001. The two synchronous minor-planet moons measure approximately 770 and 430 meters and have an orbital period of 16.46 and 150 hours, respectively. Numbering and naming This minor planet was numbered by the Minor Planet Center on 2 April 2007. As of 2018, the primary and its moons have not been named. In the scientific literature, the components of the triple system are generically referred to as Alpha, Beta and Gamma, but these labels are not recognized by the IAU. Primary 2001 SN 263, the primary object of this triple system, is an unusual carbonaceous near-Earth asteroid of a C- or somewhat brighter B-type.LCDB-Perna-2014 It orbits the Sun at a distance of 1.0–2.9 AU once every 2 years and 10 months (1,023 days). Its orbit has an eccentricity of 0.48 and an inclination of 7° with respect to the ecliptic. A first precovery was taken at Palomar Observatory during the Digitized Sky Survey in 1990, extending the body's observation arc by 11 years prior to its official discovery observation at Socorro. It has an Earth minimum orbital intersection distance (MOID) of 0.0520 AU km on off 3, which translates into 20.3 lunar distances. With an Earth MOID above 0.05 AU, 2001 SN 263 is no longer a potentially hazardous asteroid, but it was classified as such by the MPC until early 2017. Radar observations show that it measures 2.5 kilometers in diameter. Its surface has a low albedo of 0.048. Rotational lightcurves obtained from photometric observations gave a rotation period of 3.423 hours (best result) with a brightness variation between 0.13 and 0.27 magnitude (U=2/3/3).LCDB-Warner-2011 Radar observations gave a concurring period of 3.4256 hours, and subsequent modeling of both radiometric and photometric observations gave a spin axis of (309.0°, −80.0°) in ecliptic coordinates (λ, β). Triple system In 2008, scientists using the planetary radar at Arecibo Observatory discovered that the object is orbited by two satellites, when the triple asteroid made a close approach to Earth of 0.066 AU (nearly 10 million kilometers). The largest body (preliminarily called Alpha) is spheroid in shape, with principal axes of 2.8 0.1 km, 2.7 0.1 km, and 2.9 0.3 km, with an effective diameter of 2.5 0.3 km and a density of 1.1 0.2 g/cm3. The satellites, named Beta and Gamma, are several times smaller in size. Beta is 0.77 0.12 km in diameter and Gamma 0.43 0.14 km. The only other unambiguously identified triple asteroids in the near-Earth population are (136617) 1994 CC, which was discovered to be a triple system in 2009, and 3122 Florence, which was found to be a triple system in September 2017.https://cneos.jpl.nasa.gov/news/news199.html Radar Reveals Two Moons Orbiting Asteroid Florence September 1, 2017 Jet Propulsion Laboratory Orbital characteristics of satellites The orbital properties of the satellites are listed in this table. The orbital planes of both satellites are inclined relative to each other; the relative inclination is about 14 degrees. Such a large inclination is suggestive of past evolutionary events (e.g. close encounter with a terrestrial planet, mean-motion-resonance crossing) that may have excited their orbits from a coplanar configuration to an inclined state. Name Mass (est.) Semi-major axis Orbital period Eccentricity Gamma (inner) 10 10 kg 3.8 km 0.686 days 0.016 Beta (outer) 24 10 kg 16.6 km 6.225 days 0.015 Exploration This triple asteroid system is the target for the planned ASTER mission scheduled for launch in 2025 by the Brazilian Space Agency. Ferreira José Leonardo Martins Alexandre A. Miranda Rodrigo Andres O. C. Helbert Jr. Silva Alvaro Q. D. R. Ferreira Ivan Soares Sukhanov Alexander Winter Othon Cabo Development of a Solar Electric Propulsion System for the First Brazilian Deep Space Mission - IEPC-2017-166 The 35th International Electric Propulsion Conference, Georgia Institute of Technology, Atlanta, Georgia, USA. October 8–12, 2017 https://electricrocket.org/IEPC/IEPC_2017_166.pdf live https://web.archive.org/web/20220804141441/https://electricrocket.org/IEPC/IEPC_2017_166.pdf 4 August 2022 2017 Notes LCDB-Warner-2011 Warner (2011) web: lightcurve plot of (153591) 2001 SN263, Palmer Divide Observatory, Brian D. Warner (2008). Photometric observations from 20 February 2008: rotation period 3.423 0.001 hours with a brightness amplitude of 0.14 0.02 magnitude. Quality code: 3. Summary figures for all obtained lightcurves at Collaborative Asteroid Lightcurve Link (CALL) for (153591) LCDB-Perna-2014 Perna (2014): photometric observation from 24 June 2011: with a brightness amplitude of mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (153591) References 30em 2015-12-01 last obs. JPL Small-Body Database Browser: 153591 (2001 SN263) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2153591;cad=1 Jet Propulsion Laboratory 1 June 2017 153591 (2001 SN263) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=153591 3 September 2017 22 March 2017 live https://web.archive.org/web/20170322203301/http://www.minorplanetcenter.net/db_search/show_object?object_id=153591 22 March 2017 153591 (2001 SN263) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=153591 3 September 2017 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 Julia Fang Jean-Luc Margot Marina Brozovic Michael C. Nolan Lance A. M. Benner Patrick A. Taylor May 2011 Orbits of Near-Earth Asteroid Triples 2001 SN263 and 1994 CC: Properties, Origin, and Evolution http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011AJ....141..154F The Astronomical Journal 141 5 15 2011AJ....141..154F 10.1088/0004-6256/141/5/154 1012.2154 119193346 1 June 2017 153591 3 September 2017 6 M. C. Nolan E. S. Howell Ellen Howell L. A. M. Benner S. J. Ostro J. D. Giorgini M. W. Busch L. M. Carter R. F. Anderson C. Magri D. B. Campbell J. L. Margot R. Vervack February 2008 (153591) 2001 SN_263 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008CBET.1254....1N Central Bureau Electronic Telegrams 1254 1 2008CBET.1254....1N 22 March 2017 Tracy Becker E. S. Howell Ellen Howell M. C. Nolan C. Magri September 2008 Physical Modeling of Triple Near-Earth Asteroid 153591 (2001 SN263) http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008DPS....40.2806B American Astronomical Society 40 437 2008DPS....40.2806B 22 March 2017 Marco Delbo Kevin Walsh Michael Mueller Alan W. Harris Ellen S. Howell Ellen Howell March 2011 The cool surfaces of binary near-Earth asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011Icar..212..138D Icarus 212 1 138–148 2011Icar..212..138D 10.1016/j.icarus.2010.12.011 122586509 22 March 2017 Alberto Silva Betzler Alberto Brum Novaes Julian Hermogenes Quesada Celedon October 2008 A Study of the Trinary NEA 2001 SN263 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35..182B The Minor Planet Bulletin 35 4 182–184 1052-8091 2008MPBu...35..182B 22 March 2017 Oey, Julian January 2009 Lightcurve Analysis of Asteroids from Leura and Kingsgrove Observatories in the First Half of 2008 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009MPBu...36....4O The Minor Planet Bulletin 36 1 4–6 1052-8091 2009MPBu...36....4O 22 March 2017 6 Tracy M. Becker Ellen S. Howell Ellen Howell Michael C. Nolan Christopher Magri Petr Pravec Patrick A. Taylor Julian Oey David Higgins Jozef Világi Leonard Kornos Adrián Galád Stefan Gajdos Ninel M. Gaftonyuk Yurij N. Krugly Igor E. Molotov Michael D. Hicks Albino Carbognani Brian D. Warner Frederic Vachier Franck Marchis Joseph T. Pollock March 2015 Physical modeling of triple near-Earth Asteroid (153591) 2001 SN263 from radar and optical light curve observations https://echo.jpl.nasa.gov/asteroids/becker.etal.2015.2001sn263.pdf Icarus 248 499–515 2015Icar..248..499B 10.1016/j.icarus.2014.10.048 22 March 2017 free External links CBET No. 1254 – , Central Bureau for Astronomical Telegrams Robert Roy Britt, Triple Asteroid Found Near Earth, Space.com, 13 Feb 2008 Emily Lakdawalla, Triple Near-Earth Asteroid Discovered https://web.archive.org/web/20120212094714/http://www.planetary.org/blog/article/00001326/ 12 February 2012 The Planetary Society, 13 Feb 2008 Images of the asteroid and its moons https://web.archive.org/web/20200421110715/http://www.naic.edu/~pradar/asteroids/2001SN263/ 21 April 2020 A Lander to Investigate a C-type Triple Near-Earth Asteroid System: 2001 SN263 Dictionary of Minor Planet Names, Google books 153591 153591 2001SN263 153591 (153591) 2001 SN 263 153591 153591 153591 20010920