1187 Afra

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1187 Afra
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 6 December 1929
Designations
MPC designation (1187) Afra
Named after
unknown[2]
1929 XC
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 87.50 yr (31,958 days)
Aphelion 3.2281 AU
Perihelion 2.0571 AU
2.6426 AU
Eccentricity 0.2215
4.30 yr (1,569 days)
182.57°
0° 13m 45.84s / day
Inclination 10.694°
327.28°
74.624°
Physical characteristics
Dimensions 24.36±4.14 km[4]
27.64±8.39 km[5]
31.80 km (derived)[3]
31.83±3.9 km[6]
31.96±0.33 km[7]
32.15±12.85 km[8]
32.348±0.299 km[9]
33.309±0.159 km[10]
14.06993±0.00001 h[11]
14.0701±0.0005 h[12]
14.09±0.02 h[13]
0.043±0.023[8]
0.0481±0.0041[10]
0.051±0.007[9]
0.0527±0.016[6]
0.053±0.001[7]
0.06±0.04[5]
0.07±0.02[4]
SMASS = X[1] · P[10] · X[3]
11.3[6][7][10] · 11.4[3][5] · 11.5[1][8] · 11.56±0.27[14] · 11.59[4]

1187 Afra, provisional designation 1929 XC, is a dark asteroid from the central regions of the asteroid belt, approximately 32 kilometers in diameter. It was discovered by Germany astronomer Karl Reinmuth at Heidelberg Observatory on 6 December 1929.[15]

Orbit[edit]

Afra orbits the Sun at a distance of 2.1–3.2 AU once every 4 years and 4 months (1,569 days). Its orbit has an eccentricity of 0.22 and an inclination of 11° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg in January 1930, seven weeks after its official discovery observation.[15]

Physical characteristics[edit]

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.[13]

Naming[edit]

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

Unknown meaning[edit]

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 (also see category).[16]

References[edit]

  1. ^ a b c d e "JPL Small-Body Database Browser: 1187 Afra (1929 XC)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 16 August 2017.
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1187) Afra. Springer Berlin Heidelberg. p. 100. ISBN 978-3-540-00238-3. Retrieved 16 August 2017.
  3. ^ a b c d "LCDB Data for (1187) Afra". Asteroid Lightcurve Database (LCDB). Retrieved 16 August 2017.
  4. ^ a b c Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 16 August 2017.
  5. ^ a b c Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 16 August 2017.
  6. ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 16 August 2017.
  7. ^ a b c 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. Retrieved 16 August 2017.
  8. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 16 August 2017.
  9. ^ a b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 16 August 2017.
  10. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 16 August 2017.
  11. ^ Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 16 August 2017.
  12. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1187) Afra". Geneva Observatory. Retrieved 16 August 2017.
  13. ^ a b Menke, John; Cooney, Walt; Gross, John; Terrell, Dirk; Higgins, David (October 2008). "Asteroid Lightcurve Analysis at Menke Observatory". The Minor Planet Bulletin. 35 (4): 155–160. Bibcode:2008MPBu...35..155M. ISSN 1052-8091. Retrieved 16 August 2017.
  14. ^ 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. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 16 August 2017.
  15. ^ a b "1187 Afra (1929 XC)". Minor Planet Center. Retrieved 16 August 2017.
  16. ^ 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 3-540-00238-3.

External links[edit]