Astronomy:5208 Royer

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Short description: Asteroid
5208 Royer
005208-asteroid shape model (5208) Royer.png
Shape model of Royer from its lightcurve
Discovery [1]
Discovered byE. F. Helin
Discovery sitePalomar Obs.
Discovery date6 February 1989
Designations
(5208) Royer
Named afterMsgr Ronald E. Royer [1]
(American priest and
amateur astronomer)
1989 CH1
Minor planet categorymain-belt [1][2] · (middle)
Maria [3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc64.29 yr (23,481 d)
|{{{apsis}}}|helion}}2.7241 AU
|{{{apsis}}}|helion}}2.4844 AU
2.6042 AU
Eccentricity0.0460
Orbital period4.20 yr (1,535 d)
Mean anomaly345.72°
Mean motion0° 14m 4.2s / day
Inclination15.904°
Longitude of ascending node124.56°
21.407°
Physical characteristics
Mean diameter7.884±0.150 km[4]
8.081±0.121 km[5]
9.40 km (calculated)[6]
Rotation period3.866 h[7]
3.88494±0.00005 h[8]
Geometric albedo0.20 (assumed)[6]
0.270±0.059[5]
0.2854±0.0197[4]
SMASS = S [2][6]
Absolute magnitude (H)12.5[4][6]
12.6[2]


5208 Royer (prov. designation: 1989 CH1) is a stony Marian asteroid from the central regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 6 February 1989, by astronomer Eleanor Helin at the Palomar Observatory. The S-type asteroid has a rotation period of 3.87 hours and was named after American priest and amateur astronomer, Ronald Royer.[1][6]

Orbit and classification

Royer is a member of the Maria family (506),[3] a large family of stony asteroids with nearly 3,000 known members.[9]:23

It orbits the Sun in the central asteroid belt at a distance of 2.5–2.7 AU once every 4 years and 2 months (1,535 days; semi-major axis of 2.6 AU). Its orbit has an eccentricity of 0.05 and an inclination of 16° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar Observatory in November 1953, more than 35 years prior to its official discovery observation.[1]

Naming

This minor planet was named after Reverend Ronald E. Royer, an American priest as well as amateur astronomer and astrophotographer.[1] He has been a member of the Los Angeles Astronomical Society (LAAS) since 1946 and received the G. Bruce Blair Award in 2001.[10] The official naming citation was published by the Minor Planet Center on 6 April 1993 (M.P.C. 21957).[11]

Physical characteristics

In the SMASS classification, Royer is a common, stony S-type asteroid.[2][6]

Rotation period and poles

In 2004, a rotational lightcurve of Royer was obtained from photometric observations by Brazilian and Argentine astronomers. Lightcurve analysis gave a rotation period of 3.866 hours with a brightness amplitude of 0.44 magnitude ({{{1}}}).[7] In 2016, a modeled lightcurves using photometric data from various sources, rendered a sidereal period of 3.88494 and two spin axes of (258.0°, 74.0°) and (54.0°, 37.0°) in ecliptic coordinates.[8]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Royer measures 7.884 and 8.081 kilometers in diameter and its surface has an albedo of 0.2854 and 0.270, respectively,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 9.40 kilometers based on an absolute magnitude of 12.5.[6]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "5208 Royer (1989 CH1)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=5208. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "JPL Small-Body Database Browser: 5208 Royer (1989 CH1)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005208. 
  3. ↑ 3.0 3.1 "Asteroid 5208 Royer – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=5208+Royer#Asteroid%205208%20RoyerEAR-A-VARGBDET-5-NESVORNYFAM-V3.0. 
  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. 
  5. ↑ 5.0 5.1 5.2 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. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 "LCDB Data for (5208) Royer". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=5208%7CRoyer. 
  7. ↑ 7.0 7.1 Alvarez-Candal, Alvaro; Duffard, René; Angeli, Cláudia A.; Lazzaro, Daniela; Fernández, Silvia (December 2004). "Rotational lightcurves of asteroids belonging to families". Icarus 172 (2): 388–401. doi:10.1016/j.icarus.2004.06.008. Bibcode: 2004Icar..172..388A. 
  8. ↑ 8.0 8.1 Hanuš, J.; Ďurech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M. et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics 586: A108. doi:10.1051/0004-6361/201527441. ISSN 0004-6361. Bibcode: 2016A&A...586A.108H. 
  9. ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N. 
  10. ↑ "2001 G. Bruce Blair Award – Rev. Monsignor Ronald E. Royer". Western Amateur Astronomers. http://www.waa.av.org/RonRoyer_page.html. 
  11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 

External links



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