(15692) 1984 RA

Hungaria asteroid May 2018 yes (15692) 1984 RA #D6D6D6 M. Barucci Palomar Obs. 1 September 1984 (15692) 1984 RA 1986 JT 11992 SZ 26 main-belt(inner)Hungaria 23 March 2018 (JD 2458200.5) 0 41.44 yr (15,135 d) 2.1225 AU 1.7302 AU 1.9264 AU 0.1018 2.67 yr (977 d) 138.59° 0.3686 ms / day 23.217° 142.60° 273.05° 1.728 0.273 km2.43 km (calculated) 37.44 0.05 hlightcurve-plot-CS3 0.30 (assumed)0.780 0.146 E (assumed) 14.714.85 0.9714.915.0 (15692) 1984 RA is a Hungaria asteroid from the innermost regions of the asteroid belt, approximately 2 km mi off 2 us in diameter. It was discovered on 1 September 1984, by Italian astronomer Maria Barucci at the Palomar Observatory in California, United States. The presumed E-type asteroid has a longer-than average rotation period of 37.4 hours and possibly an elongated shape. Orbit and classification 1984 RA is a bright core member of the Hungaria family (003), a large family of three thousand asteroids located within the dynamical group with the same name. Hungarias form the innermost dense concentration of asteroids in the Solar System; they are inside the asteroid belt's core region, sometimes considered a completely independent population. The asteroid orbits the Sun in the innermost asteroid belt at a distance of 1.7–2.1 AU once every 2 years and 8 months (977 days; semi-major axis of 1.93 AU). Its orbit has an eccentricity of 0.10 and an inclination of 23° with respect to the ecliptic. The body's observation arc begins with a precovery found in the Digitized Sky Survey and taken at the Siding Spring Observatory in November 1977, almost 7 years prior to its official discovery observation at Palomar. Physical characteristics 1984 RA is an assumed E-type asteroid, known for their high albedos, typically around 0.4. Rotation period In July 2013, a rotational lightcurve of this asteroid was obtained from photometric observations by American astronomer Brian Warner at the Palmer Divide Station U82 in California. Lightcurve analysis gave a long rotation period of 37.44 hours with a brightness amplitude of 0.66 magnitude, indicative of an elongated shape (U=2).lightcurve-plot-CS3 While not being a slow rotator, 1984 RA has a significantly longer period than most asteroids, which rotate once every 2 to 20 hours around their axis. Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, this asteroid measures 1.728 kilometers in diameter and its surface has an exceptionally high albedo of 0.78. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30 – a compromise value between the E- (0.40) and S-type (0.20) members of the Hungaria family and group, respectively – and calculates a diameter of 2.43 kilometers based on an absolute magnitude of 15.0. Numbering and naming This minor planet was numbered by the Minor Planet Center on 26 July 2000 (M.P.C. 40991). As of 2018, it has not been named. Notes lightcurve-plot-CS3 Lightcure plot of (15692) 1984 RA, by B. D. Warner at the Center for Solar System Studies – Palmer Divide Station U82. Rotation period 37.44 0.05 hours. Observation from 8 Jul 2013 to 1 Aug 2013. Data points: 273. Quality code is 2. Summary figures at the LCDB References 30em 2018-04-26 last obs. JPL Small-Body Database Browser: 15692 (1984 RA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015692 Jet Propulsion Laboratory 10 May 2018 15692 (1984 RA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=15692 10 May 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 10 May 2018 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri J. Dailey P. R. M. Eisenhardt R. S. McMillan T. B. Spahr M. F. Skrutskie D. Tholen R. G. Walker E. L. Wright E. DeBaun D. Elsbury T. IV Gautier S. Gomillion A. Wilkins November 2011 Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 118745497 Asteroid (15692) 1984 RA – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15692#Asteroid%2015692EAR-A-VARGBDET-5-NESVORNYFAM-V3.0 27 October 2019 D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 119280014 15692 10 May 2018 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 (catalog) Warner, Brian D. January 2014 Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2013 June- September The Minor Planet Bulletin 41 1 27–32 1052-8091 2014MPBu...41...27W 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 Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center 15692 2015692 15691 Maslov 15692 015692 Category:Discoveries by Maria A. 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