15415 Rika

Main-belt asteroid May 2018 yes 15415 Rika #D6D6D6 A. Nakamura Kuma Kogen Obs. 4 February 1998 (15415) Rika 1998 CA 11983 PC 11983 PH1997 WK 22 Rika Akana (character in the drama Tokyo Love Story) main-belt(inner)backgroundFlora 23 March 2018 (JD 2458200.5) 0 63.41 yr (23,161 d) 2.7047 AU 1.6979 AU 2.2013 AU 0.2287 3.27 yr (1,193 d) 194.33° 0.3018 ms / day 7.4787° 327.38° 28.661° 2.830 0.488 km3.74 km (calculated) 6.3636 0.0008 hlcdb-Pravec-2006 0.24 (assumed)0.6053 0.2264 S (assumed) 14.214.2114.3 15415 Rika (provisional designation 1998 CA 1) is a bright background asteroid from the Florian region of the inner asteroid belt, approximately 3 km mi off 1 us in diameter. It was discovered on 4 February 1998, by Japanese astronomer Akimasa Nakamura at the Kuma Kogen Astronomical Observatory in southern Japan. The presumed S-type asteroid has a rotation period of 6.36 hours and possibly an elongated shape. It was named after Rika Akana, a character in the Japanese film and later television adapted drama Tokyo Love Story. Orbit and classification Rika is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt. It orbits the Sun in the inner asteroid belt at a distance of 1.7–2.7 astronomical units (AU) once every 3 years and 3 months (1,193 days; semi-major axis of 2.2 AU). Its orbit has an eccentricity of 0.23 and an inclination of 7° with respect to the ecliptic. Rika's observation arc begins with a precovery published by the Digitized Sky Survey and taken at the Palomar Observatory in November 1954, more than 43 years prior to its official discovery observation at Kuma Kogen. Physical characteristics Rika is an assumed, common S-type asteroid, despite the exceptionally high albedo (see below) measured by the Wide-field Infrared Survey Explorer (WISE). Rotation period In October 2006, a rotational lightcurve of Rika was obtained from photometric observations by astronomers at the Skalnaté pleso Observatory in Slovakia. Lightcurve analysis gave a well-defined rotation period of 6.3636 hours with a high brightness amplitude of 1.06 magnitude, indicating that the body has an elongated shape (U=3).lcdb-Pravec-2006 Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, Rika measures 2.830 kilometers in diameter and its surface has a high albedo of 0.6053. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the parent body of the Flora family – and calculates a diameter of 3.74 kilometers based on an absolute magnitude of 14.3. Naming This minor planet was named after Rika Akana, the heroine played by Honami Suzuki in the manga-based Japanese television drama Tokyo Love Story. Some episodes of the dorama were filmed on locations near the town of Kumakōgen, where the discovering observatory of this asteroid is located. The official naming citation was published by the Minor Planet Center on 13 October 2000 (M.P.C. 41388). Notes lcdb-Pravec-2006 Pravec (2006) Lightcurve plot of (15415) Rika by Husárik and Kusnirák, from Ondrejov data published by the NEO Photometric Program and collaborating projects: rotation period 6.3632 0.0007 hours (basically identical with 6.3636 0.0008 h) and a brightness amplitude of 1.06 mag. Quality code is 3. Summary figures at the LCDB. References 30em 2018-04-24 last obs. JPL Small-Body Database Browser: 15415 Rika (1998 CA1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015415 Jet Propulsion Laboratory 28 May 2018 15415 Rika (1998 CA1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=15415 28 May 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 28 May 2018 M. Husárik P. Kusnirák February 2008 Relative photometry of numbered asteroids (1314), (2257), (3541), (4080), (4155), (12081) and (15415) Contributions of the Astronomical Observatory Skalnaté Pleso 38 1 47–60 2008CoSka..38...47H Asteroid 15415 Rika Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15415+Rika 28 May 2018 https://web.archive.org/web/20180529054125/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15415+Rika 29 May 2018 dead 15415 28 May 2018 6 Joseph R. Masiero C. Nugent A. K. Mainzer E. L. Wright J. M. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett October 2017 NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos The Astronomical Journal 154 4 10 2017AJ....154..168M 10.3847/1538-3881/aa89ec 1708.09504 free 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 ) Dictionary of Minor Planet Names, Google books Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center 15415 15414 Pettirossi 15415 (15416) 1998 DZ2 015415 Category:Discoveries by Akimasa Nakamura Category:Named minor planets 19980204