15415 Rika
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=May 2018}}
{{Infobox planet
| minorplanet = yes
| name = 15415 Rika
| background = #D6D6D6
| image =
| image_size =
| caption =
| discoverer = A. Nakamura
| discovery_site = Kuma Kogen Obs.
| discovered = 4 February 1998
| mpc_name = (15415) Rika
| alt_names = {{mp|1998 CA|1}}{{·}}{{mp|1983 PC|1}}
1983 PH{{·}}{{mp|1997 WK|22}}
| pronounced =
| named_after = Rika Akana {{small|(character in the drama Tokyo Love Story)}}
| mp_category = main-belt{{·}}{{small|(inner)}}
background{{·}}Flora
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 63.41 yr (23,161 d)
| aphelion = 2.7047 AU
| perihelion = 1.6979 AU
| semimajor = 2.2013 AU
| eccentricity = 0.2287
| period = 3.27 yr (1,193 d)
| mean_anomaly = 194.33°
| mean_motion = {{Deg2DMS|0.3018|sup=ms}} / day
| inclination = 7.4787°
| asc_node = 327.38°
| arg_peri = 28.661°
| mean_diameter = {{val|2.830|0.488|ul=km}}
{{val|3.74|u=km}} {{small|(calculated)}}
| rotation = {{val|6.3636|0.0008|ul=h}}{{efn|name=lcdb-Pravec-2006}}
| albedo = {{val|0.24}} {{small|(assumed)}}
{{val|0.6053|0.2264}}
| spectral_type = S {{small|(assumed)}}
| abs_magnitude = 14.2
14.21
14.3
}}
15415 Rika, provisional designation {{mp|1998 CA|1}}, is a bright background asteroid from the Florian region of the inner asteroid belt, approximately {{convert|3|km|mi|abbr=off|sigfig=1|sp=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 ({{small|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 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.
The body'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 ({{small|U=3}}).{{efn|name=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 ({{small|M.P.C. 41388}}).
Notes
{{notelist|refs=
{{efn|name=lcdb-Pravec-2006|1=Pravec (2006) [http://www.asu.cas.cz/~asteroid/15415.png Lightcurve plot of (15415) Rika] by Husárik and Kusnirák, from [http://www.asu.cas.cz/~ppravec/newres.htm Ondrejov data] published by the NEO Photometric Program and collaborating projects: rotation period {{val|6.3632|0.0007}} hours (basically identical with {{val|6.3636|0.0008}} h) and a brightness amplitude of {{val|1.06}} mag. Quality code is 3. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=15415%7CRika LCDB].}}
}}
References
{{reflist|30em|refs=
|type = 2018-04-24 last obs.
|title = JPL Small-Body Database Browser: 15415 Rika (1998 CA1)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015415
|publisher = Jet Propulsion Laboratory
|accessdate = 28 May 2018}}
|title = 15415 Rika (1998 CA1)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=15415
|accessdate = 28 May 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 28 May 2018}}
|first1 = M. |last1 = Husárik
|first2 = P. |last2 = Kusnirák
|date = February 2008
|title = Relative photometry of numbered asteroids (1314), (2257), (3541), (4080), (4155), (12081) and (15415)
|journal = Contributions of the Astronomical Observatory Skalnaté Pleso
|volume = 38
|issue = 1
|pages = 47–60
|bibcode = 2008CoSka..38...47H}}
|title = Asteroid 15415 Rika
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15415+Rika
|accessdate = 28 May 2018}}
|title = LCDB Data for (15415) Rika
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=15415%7CRika
|accessdate = 28 May 2018}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = C. |last2 = Nugent
|first3 = A. K. |last3 = Mainzer
|first4 = E. L. |last4 = Wright
|first5 = J. M. |last5 = Bauer
|first6 = R. M. |last6 = Cutri
|first7 = T. |last7 = Grav
|first8 = E. |last8 = Kramer
|first9 = S. |last9 = Sonnett
|date = October 2017
|title = NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos
|journal = The Astronomical Journal
|volume = 154
|issue = 4
|page = 10
|bibcode = 2017AJ....154..168M
|doi = 10.3847/1538-3881/aa89ec
|arxiv = 1708.09504
|doi-access = free }}
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|s2cid = 53493339 }}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs015001.html Discovery Circumstances: Numbered Minor Planets (15001)-(20000)] – Minor Planet Center
- {{AstDys|15415}}
- {{JPL small body}}
{{Minor planets navigator |15414 Pettirossi |number=15415 |(15416) 1998 DZ2}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Rika}}