| Discovery [1] | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 28 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 | |
| Dimensions | 59.31 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]
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]
References
- ^ a b c d "JPL Small-Body Database Browser: 1712 Angola (1935 KC)" (2017-03-21 last obs.). Jet Propulsion Laboratory. Retrieved 1 July 2017.
- ^ a b c 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.
- ^ a b c d e f g "LCDB Data for (1712) Angola". Asteroid Lightcurve Database (LCDB). Retrieved 22 December 2016.
- ^ a b c d 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.
- ^ a b c d e 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.
- ^ a b c 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.
- ^ a b c d 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 c d 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.
- ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (1712) Angola". Geneva Observatory. Retrieved 22 December 2016.
- ^ 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.
- ^ a b "1712 Angola (1935 KC)". Minor Planet Center. Retrieved 22 December 2016.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 22 December 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form ( info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1712 Angola at AstDyS-2, Asteroids—Dynamic Site
- 1712 Angola at the JPL Small-Body Database
