790 Pretoria

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790 Pretoria
Discovery
Discovered by H. E. Wood
Discovery site Johannesburg
Discovery date January 16, 1912
Designations
1912 NW
Orbital characteristics
Epoch August 18, 2005 (JDCT 2453600.5)
Aphelion 3.923 AU
Perihelion 2.896 AU
3.409 AU
Eccentricity 0.151
6.296 a
179.112°
Inclination 20.549°
252.173°
40.434°
Physical characteristics
Dimensions 160.98 ±11.16[1] km
Mass (4.58 ± 0.28) × 1018[1] kg
Mean density
2.09 ± 0.45[1] g/cm3

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).

10µ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 175 km.[2] In the present day it is estimated to be 170 km (106 mi) in diameter.[3] 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.[4]

References[edit]

  1. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  2. ^ Morrison, D.; Chapman, C. R. (March 1976), "Radiometric diameters for an additional 22 asteroids", Astrophysical Journal 204: 934–939, Bibcode:2008mgm..conf.2594S, doi:10.1142/9789812834300_0469. 
  3. ^ "JPL Small-Body Database Browser: 790 Pretoria (1912 NW)". 2009-12-21 last obs. Retrieved 2010-09-05. 
  4. ^ Warner, Brian D. (2005), "Asteroid lightcurve analysis at the Palmer Divide Observatory - winter 2004-2005", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 32 (3): 54–58, retrieved 2013-02-03. 

External links[edit]