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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 ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3090488620880034 2.7392e-08  
a 2.926988249811633 9.4515e-09 au
q 2.022405861862391 8.0016e-08 au
i 26.19014331526897 4.1937e-06 deg
node 150.0927065608802 7.8199e-06 deg
peri 264.4148739528844 1.1228e-05 deg
M 141.249067141464 9.8872e-06 deg
tp 2458282.849514723568
(2018-Jun-13.34951472)
4.8333e-05 TDB
period 1829.068183797406
5.01
8.8593e-06
2.426e-08
d
yr
n .1968215308696632 9.5333e-10 deg/d
Q 3.831570637760875 1.2372e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2841  
   data-arc span      29702 days (81.32 yr)  
   first obs. used      1939-02-21  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43191  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:33:30  

Additional Information
 Earth MOID = 1.20656 au 
 Jupiter MOID = 2.26291 au 
 T_jup = 3.058 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456290.5 (2012-Dec-29.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3088697884838701 2.7524e-08  
q 2.023863346502481 8.0476e-08 au
tp 2456455.041712811219
(2013-Jun-11.54171281)
4.4466e-05 TDB
node 150.1167615925778 7.8254e-06 deg
peri 264.8085768579296 1.1213e-05 deg
i 26.17511241563616 4.1917e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2841  
   data-arc span      29702 days (81.32 yr)  
   first obs. used      1939-02-21  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43191  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:33:30  

Additional Information
 Jupiter MOID = 2.26291 au 
 T_jup = 3.058 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.575754529613541E-16 -2.207930247796894E-15 1.572514728282975E-13 -1.603977162448522E-15 2.355190511126805E-14 2.818408141543994E-15
q -2.207930247796894E-15 6.476438218329171E-15 -3.688215744780335E-13 3.972547177630349E-15 -5.431265683280531E-14 -7.114817452447532E-15
tp 1.572514728282975E-13 -3.688215744780335E-13 1.977196162137275E-9 -1.250529112927244E-11 3.711066617036435E-10 -4.52915688984982E-12
node -1.603977162448522E-15 3.972547177630349E-15 -1.250529112927244E-11 6.123746985219115E-11 -5.677702231117705E-11 1.93472597304401E-14
peri 2.355190511126805E-14 -5.431265683280531E-14 3.711066617036435E-10 -5.677702231117705E-11 1.257349741041107E-10 -7.359982499623408E-13
i 2.818408141543994E-15 -7.114817452447532E-15 -4.52915688984982E-12 1.93472597304401E-14 -7.359982499623408E-13 1.757051561290146E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.4   n/a MPO473785 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. 2019-August); Warner et al., 2009 Published Reference List:
[Polakis, T. (2019) Minor Planet Bull. 46, 287-292.]
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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