(15700) 1987 QD

Mars-crossing asteroid July 2018 yes (15700) 1987 QD #FA8072 S. Singer-Brewster Palomar Obs. 24 August 1987 (15700) 1987 QD 2000 JD 1 Mars-crosserbinary 23 March 2018 (JD 2458200.5) 0 63.65 yr (23,249 d) 2.9047 AU 1.5136 AU 2.2092 AU 0.3148 3.28 yr (1,199 d) 132.51° 0.3002 ms / day 26.788° 175.47° 119.47° 1 (strong candidate) 0.6219 AU (242 LD) 2.95 0.29 km3.04 km (derived) 3.0586 0.0001 hlcdb-Pravec-2010 0.20 (assumed)0.268 0.054 X (Pan-STARRS)X (SDSS-MOC)S 14.50 0.07 (R)lcdb-Pravec-201014.7014.99 0.086 (15700) 1987 QD is a Mars-crossing asteroid and a binary candidate from inside the innermost region of the asteroid belt, approximately 3 km mi off 2 us in diameter. It was discovered on 24 August 1987, by American astronomer Stephen Singer-Brewster at the Palomar Observatory in California. The likely spherical X-type asteroid has a rotation period of 3.1 hours. The suspected presence of a kilometer-sized minor-planet moon was announced in November 2000. Orbit and classification 1987 QD is a Mars-crossing asteroid, a member of the dynamically unstable group, located between the main belt and near-Earth populations, and crossing the orbit of Mars at 1.666 AU. It orbits the Sun inside the innermost region of the asteroid belt at a distance 1.5–2.9 AU once every 3 years and 3 months (1,199 days; semi-major axis of 2.21 AU). Its orbit has an eccentricity of 0.31 and an inclination of 27° with respect to the ecliptic. The body's observation arc begins with a precovery published by the Digitized Sky Survey and taken at Palomar in May 1954, more than 33 years prior to its official discovery observation. It will pass 0.04246 AU km on off flip from the main-belt asteroid 7 Iris on 3 September 2173. 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. Physical characteristics In the SDSS-based taxonomy and according to the survey conducted by Pan-STARRS, 1987 QD is an X-type asteroid. It has also been classified as a common, stony S-type asteroid. Rotation period In September 2010, a first rotational lightcurve of 1987 QD was obtained from photometric observations by Brian Skiff. Lightcurve analysis gave a rotation period of 3.068 hours and a brightness variation of 0.07 magnitude (U=3-).lcdb-Skiff-2011 Within less than two weeks, follow-up observations by a large international collaboration of astronomers determined a refined period of 3.0586 0.0001 hours with a low amplitude of 0.07 magnitude, indicating that the body has a spherical shape (U=3).lcdb-Pravec-2010 An alternative observation that gave a tentative period 9.709 hours received a poor quality rating (U=1). Strong binary candidate The photometric observations during September and October 2010 revealed that 1987 QD is a candidate for a synchronous binary asteroid with a minor-planet moon orbiting it every 50.3 0.5 hours at an estimated average distance of 14 km. The findings were announced on 6 November 2009. The lightcurve indicated mutual occultation events, however, a conclusive solution for the orbit period was not obtained.secondary-orbital-period The Johnston's archive estimates a diameter of 1.23 kilometer for the satellite, or 31% the size of its primary. The international collaboration included Richard Durkee at the Shed of Science Observatory H39, Petr Pravec, Kamil Hornoch and Peter Kušnirák at Ondřejov Observatory, Donald Pray at Carbuncle Hill Observatory 912, David Higgins at Canberra E14, Jozef Világi and Štefan Gajdoš at Modra Observatory, Judit Györgyey Ries at McDonald Observatory and Julian Oey at Leura Observatory E17, as well as astronomers at the Kharkiv Kharkov 101, Simeiz and Skalnate Pleso observatories. Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1987 QD measures 2.95 kilometers in diameter and its surface has an albedo of 0.268, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and derives a diameter of 3.04 kilometers based on an absolute magnitude of 14.99. Notes 30em lcdb-Pravec-2010 Lightcurve plot of (15700) 1987 QD from Ondrejov data obtained by the NEO Photometric Program and collaborating projects. Period 3.0586 0.0001 hours with a brightness amplitude of 0.07 0.01 mag. Quality code is 3. Summary figures at the LCDB and Pravec, P.; Wolf, M.; Sarounova, L. (2010) (data sheet). lcdb-Skiff-2011 Skiff (2011) web: rotation period 3.068 0.003 hours with a brightness amplitude of mag. Quality code is 3-. Summary figures at the LCDB secondary-orbital-period There are two possible orbital periods for the secondary: 50.3 and 62.9 hours. Neither could be conclusively established. LCDB References 30em 2018-01-20 last obs. JPL Small-Body Database Browser: 15700 (1987 QD) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015700;cad=1 Jet Propulsion Laboratory 5 July 2018 15700 (1987 QD) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=15700 5 July 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 5 July 2018 Asteroid (15700) 1987 QD Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15700 5 July 2018 J. M. Carvano P. H. Hasselmann D. Lazzaro T. Mothé-Diniz February 2010 SDSS-based taxonomic classification and orbital distribution of main belt asteroids https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab Astronomy and Astrophysics 510 12 2010A&A...510A..43C 10.1051/0004-6361/200913322 30 October 2019 free (PDS data set) Asteroids with Satellites Database – (15700) 1987 QD Johnston's Archive 19 February 2017 Johnston, Wm. Robert http://www.johnstonsarchive.net/astro/astmoons/am-15700.html 5 July 2018 (at Data Ferret) 15700 5 July 2018 V. Alí-Lagoa M. Delbo' July 2017 Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data Astronomy and Astrophysics 603 8 2017A&A...603A..55A 10.1051/0004-6361/201629917 free 1705.10263 119224590 6 R. Durkee P. Pravec K. Hornoch P. Kusnirak D. Pray W. Brookfield V. Chiorny V. Shevchenko J. Oey N. Gaftonyuk Yu. Krugly D. Higgins J. Vilagi S. Gajdos M. Husarik M. Pikler J. G. Ries November 2010 (15700) 1987 QD http://www.cbat.eps.harvard.edu/iau/cbet/002500/CBET002540.txt Central Bureau Electronic Telegrams 2540 1 2010CBET.2540....1D 5 July 2018 Vander Haagen, Gary A. April 2011 Lightcurves of 10452 ZUEV, (14657) 1998 YU27, and (15700) 1987 QD The Minor Planet Bulletin 38 2 71–72 1052-8091 2011MPBu...38...71V 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 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 B. Carry E. Solano S. Eggl F. E. DeMeo April 2016 Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry Icarus 268 340–354 2016Icar..268..340C 10.1016/j.icarus.2015.12.047 1601.02087 119258489 External links CBET 2540 – (15700) 1987 QD Central Bureau for Astronomical Telegrams, 6 Nov 2010 Asteroids with Satellites, Robert Johnston, johnstonsarchive.net 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 15700 2015700 15699 Lyytinen 15700 (15701) 1987 RG1 015700 Category:Discoveries by Stephen Singer-Brewster 015700 19870824