1712 Angola

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1712 Angola
Discovery [1]
Discovered by C. Jackson
Discovery site Johannesburg Obs.
Discovery date28 May 1935
Designations
(1712) Angola
Named after
 Angola (country) [2]
1935 KC ·1929 GC
1935 ML ·1946 JB
1953 SD ·1963 MD
main-belt  ·(outer) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 87.94 yr (32,121 days)
Aphelion 3.6492 AU
Perihelion 2.6832 AU
3.1662 AU
Eccentricity 0.1525
5.63 yr (2,058 days)
190.35°
0° 10m 29.64s / day
Inclination 19.393°
237.61°
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]
11.527 h [3]
11.5274±0.0007 h [9]
11.53 h [9]
0.029±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]
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]

    Contents

    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 ( U=3 ). [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 ( U=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]

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    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1712 Angola (1935 KC)" (2017-03-21 last obs.). Jet Propulsion Laboratory . Retrieved 1 July 2017.
    2. 1 2 3 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. 1 2 3 4 5 6 7 "LCDB Data for (1712) Angola". Asteroid Lightcurve Database (LCDB). Retrieved 22 December 2016.
    4. 1 2 3 4 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 22 October 2019.
    5. 1 2 3 4 5 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. arXiv: 1109.6407 . Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    6. 1 2 3 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 22 December 2016.
    7. 1 2 3 4 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)
    8. 1 2 3 4 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 22 December 2016.
    9. 1 2 3 4 Behrend, Raoul. "Asteroids and comets rotation curves – (1712) Angola". Geneva Observatory . 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. arXiv: 1506.00762 . Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007 . Retrieved 22 December 2016.
    11. 1 2 "1712 Angola (1935 KC)". Minor Planet Center. Retrieved 22 December 2016.
    12. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 22 December 2016.
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