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1585 Union (1947 RG)
Classification: Main-belt Asteroid          SPK-ID: 2001585
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3091664372974816 1.3765e-08  
a 2.926744021129718 9.0694e-09 au
q 2.021892999235338 4.0986e-08 au
i 26.19046312351565 4.2129e-07 deg
node 150.0947451852568 2.7179e-06 deg
peri 264.3562396408137 4.4776e-06 deg
M 219.2976776811412 7.5502e-06 deg
tp 2460111.283142400747
(2023-Jun-15.78314240)
4.0724e-05 TDB
period 1828.839261665684
5.01
8.5008e-06
2.327e-08
d
yr
n .1968461677009911 9.1498e-10 deg/d
Q 3.831595043024098 1.1873e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3427  
   data-arc span      30078 days (82.35 yr)  
   first obs. used      1939-02-21  
   last obs. used      2021-06-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .403  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:32:32  

Additional Information
 Earth MOID = 1.20546 au 
 Jupiter MOID = 2.26411 au 
 T_jup = 3.058 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.37   n/a E2021B10 IRAS observations used: 6
diameter diameter 55.271 km 0.243 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.798 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Polakis, T. (2019) Minor Planet Bull. 46, 287-292.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.031   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.590   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.56 deg.
U-B UB 0.290   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.56 deg.

1585 Union (1947 RG)          Discovered 1947-Sep-07 by Johnson, E. L. at Johannesburg (UO)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1947 RG = 1929 DB = 1937 QF = 1939 CD1 = 1944 DG = 1949 EE = 1952 QA1 = 1952 SD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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