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1585 Union information


1585 Union
Discovery[1]
Discovered byE. L. Johnson
Discovery siteUnion Obs.
Discovery date7 September 1947
Designations
MPC designation
(1585) Union
Named after
Union Observatory
(aka Johannesburg Obs.)[2]
Alternative designations
1947 RG · 1929 DB
1937 QF · 1939 CD1
1944 DG · 1949 EE
1952 QA1 · 1952 SD
Minor planet category
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc78.37 yr (28,624 days)
Aphelion3.8332 AU
Perihelion2.0231 AU
Semi-major axis
2.9281 AU
Eccentricity0.3091
Orbital period (sidereal)
5.01 yr (1,830 days)
Mean anomaly
304.39°
Mean motion
0° 11m 48.12s / day
Inclination26.187°
Longitude of ascending node
150.10°
Argument of perihelion
264.54°
Physical characteristics
Dimensions49.01±18.07 km[4]
50.42±1.6 km[3][5]
50.68±0.88 km[6]
55.271±0.243 km[7]
55.42±18.20 km[8]
56.014±0.292 km[9]
Synodic rotation period
9.38 h[10]
24 h (fragmentary)[11]
Geometric albedo
0.0304±0.0028[9]
0.031±0.004[7]
0.0378±0.003[3][5]
0.038±0.001[6]
0.04±0.04[8]
0.05±0.02[4]
Spectral type
P[9] · C[3]
B–V = 0.590[1]
U–B = 0.290[1]
Absolute magnitude (H)
10.33±0.22[12] · 10.35[8] · 10.66[1][4][5][6] · 10.67[3][9][10]

1585 Union, provisional designation 1947 RG, is a dark background asteroid from the outer regions of the asteroid belt, approximately 52 kilometers in diameter. It was discovered on 7 September 1947, by South African astronomer Ernest Johnson at the Union Observatory in Johannesburg, South Africa.[13] The asteroid was named after the discovering observatory.[2]

  1. ^ a b c d e Cite error: The named reference jpldata was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference springer was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference lcdb was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Nugent-2015 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference SIMPS was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference AKARI was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Masiero-2014 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Nugent-2016 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference WISE was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Binzel-1987b was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference geneva-obs was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Veres-2015 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference MPC-object was invoked but never defined (see the help page).

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