12564 Ikeller

12564 IkellerDiscovery[1]

Discovered by| W. Bickel
Discovery site| Bergisch Gladbach Obs.
Discovery date| 22 September 1998
Designations

MPC designation

| (12564) Ikeller
Named after| Ingeborg Bickel–Keller
(discoverer's wife)[2]

Alternative designations

| 1998 SO49 * 1988 RA7
1991 EG5 * 1993 SK13
Minor planet category| main-belt * Koronis[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 27.90 yr (10,190 days)
|{{{apsis}}}|helion}}| 2.9423 AU
|{{{apsis}}}|helion}}| 2.7273 AU

Semi-major axis

| 2.8348 AU
Eccentricity| 0.0379
Orbital period| 4.77 yr (1,743 days)
Mean anomaly| 67.076°
Mean motion| 0° 12m 23.4s / day
Inclination| 1.6200°
Longitude of ascending node| 180.04°

|{{{apsis}}}|helion}}

| 117.88°
Physical characteristics
Dimensions| 5.17 km (calculated)[3]
5.369±0.259 km[4][5]
Rotation period| 7.0321±0.0196 h (R)[6]
7.0423±0.0196 h (S)[6]
Geometric albedo| 0.222±0.049[5]
0.2225±0.0495[4]
0.24 (assumed)[3]

Spectral type

| S[3]
Absolute magnitude (H)| 13.6[1][3][4] * 13.644±0.003 (R)[6] * 14.16±0.23[7] * 14.282±0.007 (S)[6]

12564 Ikeller, provisional designation 1998 SO49, 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.[2]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Lightcurve
* 3 Naming
* 4 References
* 5 External links

## 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.[1]

The body's observation arc begins 10 years prior to its official discovery observation, with its identification as 1988 RA7 at ESO's La Silla Observatory in September 1988.[2]

## 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,[4] 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).[3]

### 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 7.0423 hours with a brightness variation of 0.44 magnitude ({{{1}}}).[6]

## Naming

This minor planet was named by the discoverer after his wife, Ingeborg Bickel–Keller (born 1941).[2] The approved naming citation was published by the Minor Planet Center on 16 January 2014 (M.P.C. 86713).[8]

## References

1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 12564 Ikeller (1998 SO49)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012564.
2. ↑ 2.0 2.1 2.2 2.3 "12564 Ikeller (1998 SO49)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=12564.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (12564) Ikeller". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=12564|Ikeller.
4. ↑ 4.0 4.1 4.2 4.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M. Retrieved 17 May 2016.
5. ↑ 5.0 5.1 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J. et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal 741 (2): 20. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 4 December 2016.
6. ↑ 6.0 6.1 6.2 6.3 6.4 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. Retrieved 17 May 2016.
7. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 17 May 2016.
8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.

## External links

* Koronis Family Asteroids Rotation Lightcurve Observing Program, Stephen M. Slivan, 2013
* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
* 12564 Ikeller at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 12564 Ikeller at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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