12564 Ikeller
{{Short description|Stony Koronian asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 12564 Ikeller
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovered = 22 September 1998
| discoverer = W. Bickel
| discovery_site = {{nowrap|Bergisch Gladbach Obs.}}
| mpc_name = (12564) Ikeller
| alt_names = {{mp|1998 SO|49}}{{·}}{{mp|1988 RA|7}}
{{mp|1991 EG|5}}{{·}}{{mp|1993 SK|13}}
| named_after = Ingeborg Bickel–Keller
{{small|(discoverer's wife)}}
| mp_category = main-belt{{·}}Koronis
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 27.90 yr (10,190 days)
| aphelion = 2.9423 AU
| perihelion = 2.7273 AU
| semimajor = 2.8348 AU
| eccentricity = 0.0379
| period = 4.77 yr (1,743 days)
| mean_anomaly = 67.076°
| mean_motion = {{Deg2DMS|0.2065|sup=ms}} / day
| inclination = 1.6200°
| asc_node = 180.04°
| arg_peri = 117.88°
| dimensions = 5.17 km {{small|(calculated)}}
{{val|5.369|0.259}} km
| rotation = {{val|7.0321|0.0196}} h {{small|(R)}}
{{val|7.0423|0.0196}} h {{small|(S)}}
| albedo = {{val|0.222|0.049}}
{{val|0.2225|0.0495}}
0.24 {{small|(assumed)}}
| spectral_type = S
| abs_magnitude = 13.6{{·}}{{val|13.644|0.003}} {{small|(R)}}{{·}}{{val|14.16|0.23}}{{·}}{{val|14.282|0.007}} {{small|(S)}}
}}
12564 Ikeller, provisional designation {{mp|1998 SO|49}}, is a stony Koronian asteroid from the outer region of the asteroid belt, approximately 5 kilometers in diameter.
The asteroid was discovered by German amateur astronomer Wolf Bickel at his private Bergisch Gladbach Observatory on 22 September 1998. It was named after the discoverer's wife, Ingeborg Bickel–Keller.
Orbit and classification
Ikeller is a member of the Koronis family, a group of stony asteroids in the outer main-belt named after 158 Koronis. It orbits the Sun at a distance of 2.7–2.9 AU once every 4 years and 9 months (1,743 days). Its orbit has an eccentricity of 0.04 and an inclination of 2° with respect to the ecliptic.
The body's observation arc begins 10 years prior to its official discovery observation, with its identification as {{mp|1988 RA|7}} at ESO's La Silla Observatory in September 1988.
Physical characteristics
According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Ikeller measures 5.4 kilometers in diameter and its surface has an albedo of 0.22, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for Koronian asteroids of 0.24 and thus calculates a smaller diameter of 5.2 kilometers, as the higher the albedo (reflectivity), the smaller a body's diameter at a certain absolute magnitude (brightness).
= Lightcurve =
In August 2012, a photometric lightcurve of Ikeller was obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of {{val|7.0423}} hours with a brightness variation of 0.44 magnitude ({{small|U=2}}).
Naming
This minor planet was named by the discoverer after his wife, Ingeborg Bickel–Keller (born 1941). The approved naming citation was published by the Minor Planet Center on 16 January 2014 ({{small|M.P.C. 86713}}).
References
{{reflist|refs=
|type = 2016-08-03 last obs.
|title = JPL Small-Body Database Browser: 12564 Ikeller (1998 SO49)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012564
|publisher = Jet Propulsion Laboratory
|access-date = 24 June 2017}}
|title = 12564 Ikeller (1998 SO49)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=12564
|access-date = 5 April 2016}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 17 May 2016}}
|title = LCDB Data for (12564) Ikeller
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=12564%7CIkeller
|access-date = 17 May 2016}}
|display-authors = 6
|first1 = A. |last1 = Mainzer
|first2 = T. |last2 = Grav
|first3 = J. |last3 = Masiero
|first4 = E. |last4 = Hand
|first5 = J. |last5 = Bauer
|first6 = D. |last6 = Tholen
|first7 = R. S. |last7 = McMillan
|first8 = T. |last8 = Spahr
|first9 = R. M. |last9 = Cutri
|first10 = E. |last10 = Wright
|first11 = J. |last11 = Watkins
|first12 = W. |last12 = Mo
|first13 = C. |last13 = Maleszewski
|date = November 2011
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 25
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|arxiv = 1109.6407
|access-date= 17 May 2016}}
|display-authors = 6
|first1 = Adam |last1 = Waszczak
|first2 = Chan-Kao |last2 = Chang
|first3 = Eran O. |last3 = Ofek
|first4 = Russ |last4 = Laher
|first5 = Frank |last5 = Masci
|first6 = David |last6 = Levitan
|first7 = Jason |last7 = Surace
|first8 = Yu-Chi |last8 = Cheng
|first9 = Wing-Huen |last9 = Ip
|first10 = Daisuke |last10 = Kinoshita
|first11 = George |last11 = Helou
|first12 = Thomas A. |last12 = Prince
|first13 = Shrinivas |last13 = Kulkarni
|date = September 2015
|title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W
|journal = The Astronomical Journal
|volume = 150
|issue = 3
|page = 35
|bibcode = 2015AJ....150...75W
|doi = 10.1088/0004-6256/150/3/75
|arxiv = 1504.04041
|access-date= 17 May 2016}}
|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
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|access-date= 17 May 2016}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = J. |last6 = Dailey
|first7 = P. R. M. |last7 = Eisenhardt
|first8 = R. S. |last8 = McMillan
|first9 = T. B. |last9 = Spahr
|first10 = M. F. |last10 = Skrutskie
|first11 = D. |last11 = Tholen
|first12 = R. G. |last12 = Walker
|first13 = E. L. |last13 = Wright
|first14 = E. |last14 = DeBaun
|first15 = D. |last15 = Elsbury
|first16 = T. IV |last16 = Gautier
|first17 = S. |last17 = Gomillion
|first18 = A. |last18 = Wilkins
|date = November 2011
|title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 20
|bibcode = 2011ApJ...741...68M
|doi = 10.1088/0004-637X/741/2/68
|arxiv = 1109.4096
|access-date= 4 December 2016}}
}}
External links
- [http://www.koronisfamily.com/ Koronis Family Asteroids Rotation Lightcurve Observing Program], Stephen M. Slivan, 2013
- [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
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs010001.html Discovery Circumstances: Numbered Minor Planets (10001)-(15000)] – Minor Planet Center
- {{AstDys|12564}}
- {{JPL small body}}
{{Minor planets navigator |(12563) 1998 SA43 |number=12564 |12565 Khege}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Ikeller}}