790 Pretoria is a minor planet orbiting the Sun that was discovered by English astronomer Harry Edwin Wood on January 16, 1912. It is a member of the Cybele group located beyond the core of the main belt[4] (see Minor planet groups) and named after Pretoria, the capital city of South Africa.
| Discovery | |
|---|---|
| Discovered by | H. E. Wood |
| Discovery site | Johannesburg Observatory |
| Discovery date | 16 January 1912 |
| Designations | |
| (790) Pretoria | |
| Pronunciation | /prɪˈtɔːriə/[1] |
| 1912 NW | |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 92.04 yr (33619 d) |
| Aphelion | 3.9279 AU (587.61 Gm) |
| Perihelion | 2.8955 AU (433.16 Gm) |
| 3.4117 AU (510.38 Gm) | |
| Eccentricity | 0.15130 |
| 6.30 yr (2301.7 d) | |
| 87.1149° | |
| 0° 9m 23.04s / day | |
| Inclination | 20.526° |
| 252.032° | |
| 38.637° | |
| Physical characteristics | |
Mean radius | 85.185±1.3 km[2] 80.49 ± 5.58 km[3] |
| Mass | (4.58 ± 0.28) × 1018 kg[3] |
Mean density | 2.09 ± 0.45 g/cm3[3] |
| 10.37 h (0.432 d) | |
| 0.0384±0.001 | |
| 8.00 | |
10μ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 175 km.[5] In the present day it is estimated to be 170 km (106 mi) in diameter.[2] Photometric measurements of the asteroid made in 2005 at the Palmer Divide Observatory showed a light curve with a period of 10.370 ± 0.002 hours and a brightness variation of 0.08 ± 0.03 in magnitude.[6]
790 Pretoria has been observed to occult 15 stars between 1998 and 2023.
References edit
- ^ "Pretoria". Dictionary.com Unabridged (Online). n.d.
- ^ a b c "JPL Small-Body Database Browser: 790 Pretoria (1912 NW)" (2009-12-21 last obs). Archived from the original on 10 June 2011. Retrieved 4 May 2016.
- ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009, S2CID 119226456. See Table 1.
- ^ De Prá, M. N.; et al. (September 2018), "PRIMASS visits Hilda and Cybele groups", Icarus, 311: 35–51, arXiv:1711.02071, Bibcode:2018Icar..311...35D, doi:10.1016/j.icarus.2017.11.012, S2CID 119383924.
- ^ Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal, vol. 204, pp. 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469.
- ^ Warner, Brian D. (2005), "Asteroid lightcurve analysis at the Palmer Divide Observatory - winter 2004-2005", The Minor Planet Bulletin, 32 (3): 54–58, Bibcode:2005MPBu...32...54W.
External links edit
- Lightcurve plot of 790 Pretoria, Palmer Divide Observatory, B. D. Warner (2009)
- 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
- 790 Pretoria at AstDyS-2, Asteroids—Dynamic Site
- 790 Pretoria at the JPL Small-Body Database
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