Astronomy:2058 Róka

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2058 Róka
Discovery [1]
Discovered byG. Kulin
Discovery siteKonkoly Obs.
Discovery date22 January 1938
Designations
(2058) Róka
Named afterGedeon Róka (1906–1974)
(Hungarian science writer)[2]
1938 BH · 1951 NP
1962 NA · 1963 UM
1974 SZ1 · 1978 AE
1985 UL3
Minor planet categorymain-belt · Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc79.18 yr (28,920 days)
|{{{apsis}}}|helion}}3.5790 AU
|{{{apsis}}}|helion}}2.6682 AU
3.1236 AU
Eccentricity0.1458
Orbital period5.52 yr (2,016 days)
Mean anomaly17.333°
Mean motion0° 10m 42.6s / day
Inclination2.5352°
Longitude of ascending node95.329°
180.50°
Physical characteristics
Dimensions21.12 km (derived)[3]
21.36±3.1 km[4]
23.40±0.52 km[5]
24.122±0.246 km[6]
24.273±0.234 km[7]
Rotation period10.04±0.02 h[8]
10.09±0.01 h[9]
Geometric albedo0.0995 (derived)[3]
0.1196±0.0252[7]
0.121±0.017[6]
0.130±0.006[5]
0.1542±0.056[4]
C [10] · S [3]
Absolute magnitude (H)11.0[4][5][7] · 11.5[1][3] · 11.56±0.34[10]


2058 Róka, provisional designation 1938 BH, is a Themistian asteroid from the outer regions of the asteroid belt, approximately 22 kilometers in diameter.

It was discovered on 22 January 1938, by Hungarian György Kulin at Konkoly Observatory in Budapest, Hungary.[11] The asteroid was named in memory of Hungarian science writer Gedeon Róka.[2]

Classification and orbit

Róka is a member of the Themis family, a dynamical family of carbonaceous outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.7–3.6 AU once every 5 years and 6 months (2,016 days). Its orbit has an eccentricity of 0.15 and an inclination of 3° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Konkoly in 1938.[11]

Physical characteristics

Róka has been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey.[10] Due to its ambivalent albedo it is also an assumed S-type asteroid.[3]

Lightcurves

In March 2005, a rotational lightcurve of Róka was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 10.04 hours with a brightness variation of 0.34 magnitude ({{{1}}}).[8] One month later, astronomer at the Rose-Hulman Observatory obtained another lightcurve with a concurring period of 10.09 hours and an amplitude of 0.40 magnitude ({{{1}}}).[9]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Róka measures between 21.36 and 24.273 kilometers in diameter and its surface has an albedo between 0.1196 and 0.1542.[4][5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0995 and calculates a diameter of 21.12 kilometers based on an absolute magnitude of 11.5.[3]

Naming

This minor planet was named in memory of Gedeon Róka (1906–1974), a Hungarian science writer and popularizer of astronomy from Budapest.[2] The approved naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5183).[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 2058 Roka (1938 BH)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002058. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(2058) Róka". Dictionary of Minor Planet Names – (2058) Róka. Springer Berlin Heidelberg. pp. 166–167. doi:10.1007/978-3-540-29925-7_2059. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (2058) Róka". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2058%7CRóka. 
  4. ↑ 4.0 4.1 4.2 4.3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019. 
  5. ↑ 5.0 5.1 5.2 5.3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  6. ↑ 6.0 6.1 6.2 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 29 June 2017. 
  7. ↑ 7.0 7.1 7.2 7.3 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. 
  8. ↑ 8.0 8.1 Behrend, Raoul. "Asteroids and comets rotation curves – (2058) Róka". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#002058. 
  9. ↑ 9.0 9.1 Addleman, Don; Covele, Brent; Duncan, Allison; Johnson, Jama; Kramb, Steve; Lecrone, Crystal et al. (December 2005). "Rose-Hulman spring 2005 lightcurve results: 155 Scylla, 590 Tomyris, 1655 Comas Solá, 2058 Roka, 6379 Vrba, and (25934) 2001 DC74.". The Minor Planet Bulletin 32 (4): 76–78. ISSN 1052-8091. Bibcode: 2005MPBu...32...76A. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2005MPBu...32...76A. Retrieved 29 June 2017. 
  10. ↑ 10.0 10.1 10.2 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 29 June 2017. 
  11. ↑ 11.0 11.1 "2058 Roka (1938 BH)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2058. 
  12. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 

External links



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