Astronomy:1187 Afra

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1187 Afra
001187-asteroid shape model (1187) Afra.png
Modelled shape of Afra from its lightcurve
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date6 December 1929
Designations
(1187) Afra
Named afterunknown[2]
1929 XC
Minor planet category
Orbital characteristics[3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc90.16 yr (32,932 d)
|{{{apsis}}}|helion}}3.2285 AU
|{{{apsis}}}|helion}}2.0523 AU
2.6404 AU
Eccentricity0.2227
Orbital period4.29 yr (1,567 d)
Mean anomaly52.040°
Mean motion0° 13m 46.92s / day
Inclination10.697°
Longitude of ascending node327.16°
74.956°
Physical characteristics
Mean diameter
  • 31.83±3.9 km[6]
  • 31.96±0.33 km[7]
  • 32.348±0.299 km[8]
Rotation period
  • 14.06993±0.00001 h[9]
  • 14.0701±0.0005 h[10]
  • 14.09±0.02 h[11]
  • 14.645±0.006 h[12]
Geometric albedo
SMASS = X[3]
Absolute magnitude (H)11.50[1][3]


1187 Afra (prov. designation: 1929 XC) is a dark background asteroid from the central regions of the asteroid belt. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 6 December 1929.[1] The X-type asteroid has a rotation period of 14.1 hours and measures approximately 32 kilometers (20 miles) in diameter. The origin of the asteroid's name remains unknown.

Orbit and classification

Afra is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the central asteroid belt at a distance of 2.1–3.2 AU once every 4 years and 3 months (1,567 days; semi-major axis of 2.64 AU). Its orbit has an eccentricity of 0.22 and an inclination of 11° with respect to the ecliptic.[3] The body's observation arc begins at Heidelberg in January 1930, seven weeks after its official discovery observation.[1]

Naming

It is not known to what person, group of persons, or occurrence the name "Afra" refers to.[2]

Unknown meaning

Among the many thousands of named minor planets, Afra is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.[13]

Physical characteristics

The lightcurve of Afra shows a periodicity of 14.09±0.02 hours, during which time the brightness of the object varies by 0.40±0.02 in magnitude.[11][14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Cite error: Invalid <ref> tag; no text was provided for refs named MPC-object
  2. ↑ 2.0 2.1 Schmadel, Lutz D. (2007). "(1187) Afra". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 100. doi:10.1007/978-3-540-29925-7_1188. ISBN 978-3-540-00238-3. https://archive.org/details/dictionaryminorp00schm. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 "JPL Small-Body Database Browser: 1187 Afra (1929 XC)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001187. Retrieved 14 March 2020. 
  4. ↑ 4.0 4.1 "Asteroid 1187 Afra – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1187. 
  5. ↑ 5.0 5.1 "Asteroid 1187 Afra". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1187+Afra. Retrieved 14 March 2020. 
  6. ↑ 6.0 6.1 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 14 March 2020. 
  7. ↑ 7.0 7.1 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)
  8. ↑ 8.0 8.1 Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R. et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System. Bibcode: 2016PDSS..247.....M. https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab. Retrieved 14 March 2020. 
  9. ↑ Ďurech, J.; Hanuš, J.; Oszkiewicz, D.; Vančo, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics 587: A48. doi:10.1051/0004-6361/201527573. ISSN 0004-6361. Bibcode: 2016A&A...587A..48D. 
  10. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (1187) Afra". Geneva Observatory. http://obswww.unige.ch/~behrend/page3cou.html#001187. Retrieved 14 March 2020. 
  11. ↑ 11.0 11.1 Menke, John; Cooney, Walt; Gross, John; Terrell, Dirk; Higgins, David (October 2008). "Asteroid Lightcurve Analysis at Menke Observatory". Minor Planet Bulletin 35 (4): 155–160. ISSN 1052-8091. Bibcode: 2008MPBu...35..155M. http://www.minorplanet.info/MPB/issues/MPB_35-4.pdf. 
  12. ↑ Clark, Maurice (July 2019). "Asteroid Photometry from the Preston Gott Observatory". Minor Planet Bulletin 46 (3): 346–349. ISSN 1052-8091. Bibcode: 2019MPBu...46..346C. http://www.minorplanet.info/MPB/issues/MPB_46-3.pdf. 
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named DOMPN-unknown
  14. ↑ "LCDB Data for (1187) Afra". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1187. Retrieved 14 March 2020. 

External links



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