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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 49 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3091282831010794 2.7351e-08  
a 2.926698949445004 9.4194e-09 au
q 2.021973528049337 7.988e-08 au
i 26.19044941350894 4.1132e-06 deg
node 150.094252962419 7.8057e-06 deg
peri 264.385260279582 1.113e-05 deg
M 180.6633317530211 9.9442e-06 deg
tp 2460111.528788095168
(2023-Jun-16.02878810)
5.3248e-05 TDB
period 1828.79701580374
5.01
8.8288e-06
2.417e-08
d
yr
n .1968507149175237 9.5033e-10 deg/d
Q 3.831424370840671 1.2331e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3004  
   data-arc span      29915 days (81.90 yr)  
   first obs. used      1939-02-21  
   last obs. used      2021-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42313  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:04:41  

Additional Information
 Earth MOID = 1.20528 au 
 Jupiter MOID = 2.26351 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Mar-06 11:55 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin