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] 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] 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] 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 1514 Ricouxa Auguste Charlois , Johann Palisa , Max Wolf and Karl Reinmuth .[ 13]
Physical characteristics
The lightcurve of Afra shows a periodicity of ± 0.02± 0.02[ 11] [ 14]
References
^ a b c d e "1187 Afra (1929 XC)" . Minor Planet Center . Retrieved 14 March 2020 .^ a b 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 ^ a b c d e "JPL Small-Body Database Browser: 1187 Afra (1929 XC)" (2020-02-04 last obs.). Jet Propulsion Laboratory . Archived from the original on 18 September 2020. Retrieved 14 March 2020 .^ a b "Asteroid 1187 Afra – Proper Elements" . AstDyS-2, Asteroids – Dynamic Site. Retrieved 14 March 2020 .^ a b "Asteroid 1187 Afra" . Small Bodies Data Ferret . Retrieved 14 March 2020 .^ a b 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 . Retrieved 14 March 2020 . ^ a b 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. Bibcode :2011PASJ...63.1117U . doi :10.1093/pasj/63.5.1117 . online , AcuA catalog p. 153 )^ a b 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 . Retrieved 14 March 2020 . ^ Ďurech, J.; Hanuš, J.; Oszkiewicz, D.; Vančo, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics . 587 : A48. arXiv :1601.02909 Bibcode :2016A&A...587A..48D . doi :10.1051/0004-6361/201527573 . ISSN 0004-6361 . ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1187) Afra" . Geneva Observatory. Retrieved 14 March 2020 . ^ a b Menke, John; Cooney, Walt; Gross, John; Terrell, Dirk; Higgins, David (October 2008). "Asteroid Lightcurve Analysis at Menke Observatory" (PDF) . Minor Planet Bulletin . 35 (4): 155– 160. Bibcode :2008MPBu...35..155M . ISSN 1052-8091 . ^ Clark, Maurice (July 2019). "Asteroid Photometry from the Preston Gott Observatory" (PDF) . Minor Planet Bulletin . 46 (3): 346– 349. Bibcode :2019MPBu...46..346C . ISSN 1052-8091 . ^ Schmadel, Lutz D. (2007). "Appendix 11 – Minor Planet Names with Unknown Meaning". Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision . Springer Berlin Heidelberg. pp. 927– 929. ISBN 978-3-540-00238-3 ^ "LCDB Data for (1187) Afra" . Asteroid Lightcurve Database (LCDB). Retrieved 14 March 2020 .
External links
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