790 Pretoria

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790 Pretoria
Discovery
Discovered by H. E. Wood
Discovery site Johannesburg
Discovery date 16 January 1912
Designations
MPC designation (790) Pretoria
1912 NW
Orbital characteristics[1]
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°
Earth MOID 1.90654 AU (285.214 Gm)
Jupiter MOID 1.26807 AU (189.701 Gm)
Jupiter Tisserand parameter 3.024
Physical characteristics
Mean radius
85.185±1.3 km[1]
80.49 ± 5.58 km[2]
Mass (4.58 ± 0.28) × 1018 kg[2]
Mean density
2.09 ± 0.45 g/cm3[2]
10.37 h (0.432 d)
0.0384±0.001
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).

10µ radiometric data collected from Kitt Peak in 1975 gave a diameter estimate of 175 km.[3] In the present day it is estimated to be 170 km (106 mi) in diameter.[1] 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 "JPL Small-Body Database Browser: 790 Pretoria (1912 NW)" (2009-12-21 last obs). Retrieved 4 May 2016. 
  2. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, Bibcode:2012P&SS...73...98C, arXiv:1203.4336Freely accessible, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  3. ^ 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. 
  4. ^ 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, retrieved 2013-02-03. 

External links[edit]