(12538) 1998 OH

Near-earth Apollo asteroid October 2019 yes (12538) 1998 OH #FFC2E0 NEAT Haleakala Obs. 19 July 1998 (12538) 1998 OH NEOApolloPHA 4 September 2017 (JD 2458000.5) 0 25.96 yr (9,483 days) 2.1674 AU 0.9155 AU 1.5414 AU 0.4061 1.91 yr (699 days) 58.305° 0.5150 ms / day 24.529° 220.75° 321.72° 0.0280 AU10.9 LD 1.663 0.329 km2.06 km (calculated) 2.58 0.001 h2.582 0.001 h5.088 0.004 h5.154 h5.191 0.002 h5.833 0.005 h 0.20 (assumed)0.232 0.116 SMASS S:S 15.816.1 (12538) 1998 OH is a stony asteroid, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.8 km us in diameter. It was discovered on 19 July 1998, by astronomers of the Near-Earth Asteroid Tracking program at the Haleakala Observatory in Hawaii, United States. This minor planet was numbered by the Minor Planet Center on 23 November 1999. As of 2018, it has not been named. In 2019, the asteroid came within about 73 lunar distances of Earth. Orbit and classification 1998 OH is a member of the Apollo group of asteroids, which are Earth-crossing asteroids. They are the largest group of near-Earth objects with approximately 10,000 known members. It orbits the Sun at a distance of 0.9–2.2 AU in 1 year and 11 months (699 days). Its orbit has an eccentricity of 0.41 and an inclination of 25° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Palomar Observatory in October 1991, more than 7 years prior to its official discovery observation at Haleakala. The asteroid has an Earth minimum orbital intersection distance of 0.0280 AU e6km e6mi unit off 3, which corresponds to 10.9 lunar distances and makes it a potentially hazardous asteroid due to its sufficiently large size. It will pass close to Earth in 2042 and 2132, at distances of 0.0292 AU and 0.0317 AU, respectively. Physical characteristics In the SMASS classification, 1998 OH is a common stony S-type asteroid. In 2014, several rotational lightcurves of 1998 OH were obtained from photometric observations by American astronomer Brian Warner at the Palmer Divide Station in California, by the Spanish amateur astronomer group OBAS, and by astronomers of the EURONEAR lightcurve NEO survey. Lightcurve analysis gave a rotation period of 5.154 hours with an alternative period solution of 2.58 hours, or half the period. The asteroid's brightness amplitude is rather low with a maximum between 0.11 and 0.20 magnitude, which is indicative for a spherical rather than elongated shape (U=3/3/2-/3/2/2).lightcurve-plot-Warner-2014lightcurve-plot-Warner-2016 According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1998 OH measures 1.663 kilometers in diameter and its surface has an albedo of 0.232. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 2.06 kilometers based on an absolute magnitude of 15.8. See also List of asteroid close approaches to Earth in 2019 Notes lightcurve-plot-Warner-2014 Lightcurve plot of (12538) by Brian Warner (2014) at the Center for Solar System Studies (CS3), with rotation period 5.833 0.005 hours with a brightness amplitude of 0.12 0.02 mag. Quality Code of 2. Summary figures for (12538) at LCDB lightcurve-plot-Warner-2016 Lightcurve plot of (12538) by Brian Warner (2016) at the Center for Solar System Studies (CS3), with rotation period 5.154 0.002 hours with a brightness amplitude of 0.20 mag. Quality Code of 3. Summary figures for (12538) at LCDB References 30em JPL Small-Body Database Browser: 12538 (1998 OH) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012538 31 October 2017 Jet Propulsion Laboratory 2017-09-26 last obs. 12538 (1998 OH) https://www.minorplanetcenter.net/db_search/show_object?object_id=12538 31 October 2017 Minor Planet Center MPC/MPO/MPS Archive https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 Minor Planet Center Mainzer A. Grav T. Bauer J. Masiero J. McMillan R. S. Cutri R. M. Walker R. Wright E. Eisenhardt P. Tholen D. J. Spahr T. Jedicke R. Denneau L. DeBaun E. Elsbury D. 6 December 2011 NEOWISE Observations of Near-Earth Objects: Preliminary Results The Astrophysical Journal 743 2 17 1109.6400 2011ApJ...743..156M 10.1088/0004-637X/743/2/156 T. Gautier S. Gomillion E. Hand W. Mo J. Watkins A. Wilkins G. L. Bryngelson A. Del Pino Molina S. Desai M. Gómez Camus S. L. Hidalgo I. Konstantopoulos J. A. Larsen C. Maleszewski M. A. Malkan J.-C. Mauduit B. L. Mullan E. W. Olszewski J. Pforr A. Saro J. V. Scotti L. H. Wasserman 12538 31 October 2017 Asteroid Lightcurve Database (LCDB) Mainzer A. Grav T. Masiero J. Hand E. Bauer J. Tholen D. McMillan R. S. Spahr T. Cutri R. M. Wright E. Watkins J. Mo W. Maleszewski C. 6 November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results The Astrophysical Journal 741 2 25 1109.6407 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 Warner Brian D. Brian D. Warner April 2015 Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 October–December The Minor Planet Bulletin 42 2 115–127 2015MPBu...42..115W 1052-8091 Lozano Juan Flores Angel Mas Vicente Fornas Gonzalo Rodrigo Onofre Brines Pedro Forna Alvaro Herrero David Carreñ o Alfonso Arce Enrique 6 April 2017 Seven Near-Earth Asteroids at Asteroids Observers (OBAS) - MPPD: 2016 June–November The Minor Planet Bulletin 44 2 108–111 2017MPBu...44..108L 1052-8091 Vaduvescu O. Macias A. Aznar Tudor V. Predatu M. Galád A. Gajdos S. Világi J. Stevance H. F. Errmann R. Unda-Sanzana E. Char F. Peixinho N. Popescu M. Sonka A. Cornea R. 6 August 2017 The EURONEAR Lightcurve Survey of Near Earth Asteroids Earth 120 2 41–100 2017EM&P..120...41V 10.1007/s11038-017-9506-9 10316/80202 free O. Suciu R. Toma P. Santos-Sanz A. Sota J. Licandro M. Serra-Ricart D. Morate T. Mocnik M. Diaz Alfaro F. Lopez-Martinez J. McCormac N. Humphries Warner Brian D. Brian D. Warner April 2017 Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2016 October–December The Minor Planet Bulletin 44 2 98–107 2017MPBu...44...98W 1052-8091 External links (12538) 1998 OH at the EARN Near-Earth Asteroids Data Base Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books 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 12538 12538 1998OH 12537 Kendriddle 12538 12539 Chaikin 012538 012538 012538 19980719