Astronomy:790 Pretoria
From HandWiki
| 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) |
| |{{{apsis}}}|helion}} | 3.9279 astronomical unit|AU (587.61 Gm) |
| |{{{apsis}}}|helion}} | 2.8955 AU (433.16 Gm) |
| 3.4117 AU (510.38 Gm) | |
| Eccentricity | 0.15130 |
| Orbital period | 6.30 yr (2301.7 d) |
| Mean anomaly | 87.1149° |
| Mean motion | 0° 9m 23.04s / day |
| Inclination | 20.526° |
| Longitude of ascending node | 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] |
| Rotation period | 10.37 h (0.432 d) |
| Geometric albedo | 0.0384±0.001 |
| Absolute magnitude (H) | 8.00 |
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 .
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
- ↑ "Pretoria". Dictionary.com Unabridged. Random House. https://www.dictionary.com/browse/Pretoria.
- ↑ 2.0 2.1 2.2 "JPL Small-Body Database Browser: 790 Pretoria (1912 NW)". https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=790.
- ↑ 3.0 3.1 3.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73 (1): 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
- ↑ De Prá, M. N. et al. (September 2018), "PRIMASS visits Hilda and Cybele groups", Icarus 311: 35–51, doi:10.1016/j.icarus.2017.11.012, Bibcode: 2018Icar..311...35D.
- ↑ Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal 204: pp. 934–939, doi:10.1142/9789812834300_0469, Bibcode: 2008mgm..conf.2594S.
- ↑ 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
- Lightcurve plot of 790 Pretoria, Palmer Divide Observatory, B. D. Warner (2009)
- Asteroid Lightcurve Database (LCDB), query form (info )
- 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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