Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
1585 Union (1947 RG)
Classification: Main-belt Asteroid          SPK-ID: 2001585
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer 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.


[ revert to old Java-based viewer ]

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jul-15 05:52 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin