790 Pretoria

790 Pretoria
Discovery
Discovered by	H. E. Wood
Discovery site	Johannesburg Observatory
Discovery date	16 January 1912
Designations
MPC designation	(790) Pretoria
Pronunciation	/prɪˈtɔːriə/[1]
Alternative designations	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)
Semi-major axis	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°
Argument of perihelion	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 (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.[4] 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.[5]

References

"Pretoria". Dictionary.com Unabridged. Random House.
"JPL Small-Body Database Browser: 790 Pretoria (1912 NW)" (2009-12-21 last obs). Retrieved 4 May 2016.
Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal, 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), pp. 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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
790 Pretoria at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.

[1] "Pretoria". Dictionary.com Unabridged. Random House.

[jpldata-2] "JPL Small-Body Database Browser: 790 Pretoria (1912 NW)" (2009-12-21 last obs). Retrieved 4 May 2016.

[Carry2012-3] Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.

[Morrison1976-4] Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal, 204, pp. 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469.

[Warner2005-5] Warner, Brian D. (2005), "Asteroid lightcurve analysis at the Palmer Divide Observatory - winter 2004-2005", The Minor Planet Bulletin, 32 (3), pp. 54–58, Bibcode:2005MPBu...32...54W.