1585 Union

1585 Union

Discovery
Discovered by	E. L. Johnson
Discovery site	Johannesburg (UO)
Discovery date	7 September 1947
Designations
MPC designation	1585
Alternative names	1947 RG, 1929 DB, 1937 QF, 1939 CD1, 1944 DG, 1949 EE, 1952 QA1, 1952 SD
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	68.60 yr (25055 days)
Aphelion	3.8321324 AU (573.27885 Gm)
Perihelion	2.0224364 AU (302.55218 Gm)
Semi-major axis	2.9272844 AU (437.91551 Gm)
Eccentricity	0.3091083
Orbital period	5.01 yr (1829.3 d)
Mean anomaly	225.62454°
Mean motion	0° 11^m 48.45^s / day
Inclination	26.188260°
Longitude of ascending node	150.09385°
Argument of perihelion	264.59291°
Earth MOID	1.20593 AU (180.405 Gm)
Jupiter MOID	2.26628 AU (339.031 Gm)
Jupiter Tisserand parameter	3.058
Proper orbital elements
Proper mean motion	0.19656 deg / yr
Proper orbital period	1831.50183 yr (668956.044 d)
Physical characteristics
Dimensions	50.42
Mean radius	25.21 ± 0.8 km
Rotation period	9.38 h (0.391 d)
Sidereal rotation period	9.38 hours
Geometric albedo	0.0378 ± 0.003
Absolute magnitude (H)	10.66

1585 Union (1947 RG) is a main-belt asteroid discovered on September 7, 1947, by E. L. Johnson at Johannesburg (UO).

References

1. "1585 Union (1947 RG)". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 2001585. Retrieved 25 April 2016.

• Binzel, R.P. (1987) Icarus 72, 135-208.

External links

• 1585 Union at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters