(6178) 1986 DA

Asteroid October 2019 yes (6178) 1986 DA #FFC2E0 16 February 1986 M. Kizawa Shizuoka Obs. (6178) 1986 DA AmorNEO 4 September 2017 (JD 2458000.5) 0 38.03 yr (13,890 days) 4.4648 AU 1.1805 AU 2.8226 AU 0.5818 4.74 yr (1,732 days) 233.20° 0.2078 ms / day 4.3056° 64.643° 127.36° 0.1922 AU 74.9 LD 0.5212 AU 2.3 km (dated)3.149 km3.15 km (taken)3.199 0.207 km 3.50 hlcdb-Pravec3.51 h 0.07780.150.161 0.034 MB–V = 0.677U–B = 0.267 15.115.40 0.1 (R)lcdb-Pravec15.9 0.11216.11 (6178) 1986 DA is a metallic asteroid, classified as a near-Earth object of the Amor group, approximately 3 kilometers in diameter. It was discovered on 16 February 1986, by Japanese astronomer Minoru Kizawa at Shizuoka Observatory, Japan. 1986 DA was the first near Earth asteroid thought to be of metallic composition, with high radar brightness; with that it was predicted to have 100 thousand tons of platinum group metals including gold and suggested as a resource for future space colonists.https://www.jpl.nasa.gov/news/news.php?feature=5670 Near-Earth Metal Asteroid Discovered NASA/JPL 2018-10-30 Orbit and classification As an eccentric Amor asteroid has an Earth minimum orbit intersection distance of 0.1922 AU km on 3 and approaches the orbit of Earth from the outside but does not cross it. It crosses however the orbit of Mars and can be classified as a Mars-crosser and also approaches the orbit of Jupiter within 0.5 AU. The asteroid orbits the Sun at a distance of 1.2–4.5 AU once every 4 years and 9 months (1,732 days). Its orbit has an eccentricity of 0.58 and an inclination of 4° with respect to the ecliptic. The first precovery was taken at Siding Spring Observatory in 1977, extending the asteroid's observation arc by 9 years prior to its discovery. Physical characteristics The metallic M-type asteroid is notable for being significantly more radar-reflective than other asteroids. Radar measurements suggest it is composed of nickel and iron and that it was derived from the center of a much larger object that experienced melting and differentiation. The observed radar albedo was 0.58 and the optical albedo was 0.14. Rotation and shape It was most probably formed from a larger body through a catastrophic collision with another object. Radar measurements of this body indicate that the surface is relatively smooth on scales of less than a meter, but it is highly irregular on scales of 10–100 meters.February 2016 Several lightcurve analysis gave it a concurring rotation period of 3.50 to 3.51 hours with a relatively high brightness amplitude between 0.03 and 0.48 in magnitude, indicating an irregular shape (U=3/3/n.a.).lcdb-Pravec Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid has an albedo of 0.08 and 0.16, and a diameter of 3.1 to 3.2 kilometers, respectively. The Collaborative Asteroid Lightcurve Link selects 3.15 kilometers as best result, while the first estimate from 1994 gave a diameter of 2.3 kilometers. Mining considerations The asteroid achieved its most notable recognition when scientists revealed that it contained over "10,000 tons of gold and 100,000 tons of platinum", or an approximate value at the time of its discovery of "$90 billion for the gold and a cool trillion dollars for the platinum, plus loose change for the asteroid's 10 billion tons of iron and a billion tons of nickel." In 2024 the estimated value of 100,000 tons of platinum was worth approximately 3.4 trillion US dollars. The delta-v for a spacecraft rendezvous with this asteroid from low Earth orbit is 7.1 km/s. Notes lcdb-Pravec Pravec (1999) web: rotation period 3.50 hours with a brightness amplitude of 0.3 mag. H = 15.4. No LCDB quality code assigned. No lightcurve published (note: "N"). Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (6178) and Pravec, P.; Wolf, M.; Sarounova, L. (1999) See also Psyche (spacecraft), planned mission to heaviest metal asteroid 16 Psyche References 2015-07-28 last obs. JPL Small-Body Database Browser: 6178 (1986 DA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2006178 Jet Propulsion Laboratory 26 May 2017 6178 (1986 DA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=6178 26 May 2016 S. J. Ostro K. D. Rosema D. B. Campbell J. F. Chandler A. A. Hine R. S. Hudson June 1991 Asteroid 1986 DA - Radar evidence for a metallic composition Science 1399–1404 0036-8075 1991Sci...252.1399O 10.1126/science.252.5011.1399 17772910 252 5011 2060/19920003664 2510757 free 6 Steven J. Ostro D. B. Campbell J. F. Chandler A. A. Hine R. S. Hudson K. D. Rosema Irwin I. Shapiro October 1991 Asteroid 1986 DA: Radar evidence for a metallic composition Science 252 5011 1399–1704 10.1126/science.252.5011.1399 17772910 1991plas.rept..174O 2060/19920003664 2510757 free Delta-v for spacecraft rendezvous with all known near-Earth asteroids NASA 2006-06-01 http://echo.jpl.nasa.gov/~lance/delta_v/delta_v.rendezvous.html https://web.archive.org/web/20010603042837/http://echo.jpl.nasa.gov/~lance/delta_v/delta_v.rendezvous.html dead 2001-06-03 8 June 2006 6178 26 May 2016 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 11104/0217021 free 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 118700974 Wisniewski, W. Z. June 1987 Photometry of six radar target asteroids Icarus 566–572 0019-1035 1987Icar...70..566W 10.1016/0019-1035(87)90096-0 70 3 Zeigler, K. W. March 1990 Photoelectric Photometry of Asteroids 81 Terpsichore, 381 Myrrha, and 1986 DA The Minor Planet Bulletin 17 1 1990MPBu...17....1Z External links 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 6178 6178 1986DA (6177) 1986 CE2 6178 6179 Brett 006178 006178 Discoveries by Minoru Kizawa 19860216