Astronomy:1712 Angola

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Short description: Asteroid
1712 Angola
Discovery[1]
Discovered byC. Jackson
Discovery siteJohannesburg Obs.
Discovery date28 May 1935
Designations
(1712) Angola
Named afterAngola (country)[2]
1935 KC · 1929 GC
1935 ML · 1946 JB
1953 SD · 1963 MD
Minor planet categorymain-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc87.94 yr (32,121 days)
|{{{apsis}}}|helion}}3.6492 AU
|{{{apsis}}}|helion}}2.6832 AU
3.1662 AU
Eccentricity0.1525
Orbital period5.63 yr (2,058 days)
Mean anomaly190.35°
Mean motion0° 10m 29.64s / day
Inclination19.393°
Longitude of ascending node237.61°
18.217°
Physical characteristics
Dimensions59.31 km (derived)[3]
59.48±2.3 km[4]
64.904±1.218 km[5]
66.892±0.298[6]
70.07±1.03 km[7]
74.47±0.68 km[8]
Rotation period11.527 h[3]
11.5274±0.0007 h[9]
11.53 h[9]
Geometric albedo0.029±0.003[8][6]
0.043±0.002[7]
0.0458 (derived)[3]
0.0504±0.0126[5]
0.0600±0.005[4]
P[5] · C[3]
Absolute magnitude (H)9.8[4][5][7] · 10.1[1][3][8] · 10.15±0.24[10]


1712 Angola, provisional designation 1935 KC, is a dark asteroid from the outer regions of the asteroid belt, approximately 66 kilometers in diameter. It was discovered on 28 May 1935, by English-born South African astronomer Cyril Jackson at Johannesburg Observatory in South Africa.[11] It is named after the Republic of Angola.[2]

Orbit

Angola orbits the Sun in the outer main-belt at a distance of 2.7–3.6 AU once every 5 years and 8 months (2,058 days). Its orbit has an eccentricity of 0.15 and an inclination of 19° with respect to the ecliptic.[1] Angola was first identified as 1929 GC at Johannesburg in 1929, extending the body's observation arc by 6 years prior to its official discovery observation.[11]

Lightcurve

In July 2003, French amateur astronomer René Roy obtained a rotational lightcurve of Angola. It gave a well-defined rotation period of 11.5274 hours with a brightness variation of 0.38 magnitude ({{{1}}}).[9] Photometric observations by ESO's CCD-specialist Cyril Cavadore gave an identical period of 11.53 hours with an insufficient amplitude of 0.02 magnitude ({{{1}}}).[9]

Spectra, diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, Angola measures between 59.48 and 70.07 kilometers in diameter and its surface has an albedo between 0.029 and 0.060.[4][6][7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0458 and a diameter of 59.31 kilometers based on an absolute magnitude of 10.1.[3] The carbonaceous C-type asteroid is also classified a dark P type by WISE.[5]

Naming

This minor planet is named for Angola, the state on the southwestern coast of Africa.[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: 1712 Angola (1935 KC)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001712. Retrieved 1 July 2017. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1712) Angola". Dictionary of Minor Planet Names – (1712) Angola. Springer Berlin Heidelberg. p. 136. doi:10.1007/978-3-540-29925-7_1713. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (1712) Angola". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1712%7CAngola. Retrieved 22 December 2016. 
  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 5.4 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. 
  6. ↑ 6.0 6.1 6.2 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. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 22 December 2016. 
  7. ↑ 7.0 7.1 7.2 7.3 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)
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 22 December 2016. 
  9. ↑ 9.0 9.1 9.2 9.3 Behrend, Raoul. "Asteroids and comets rotation curves – (1712) Angola". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001712. Retrieved 22 December 2016. 
  10. ↑ 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 22 December 2016. 
  11. ↑ 11.0 11.1 "1712 Angola (1935 KC)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1712. Retrieved 22 December 2016. 
  12. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 22 December 2016. 

External links



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