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1838 Ursa (1971 UC)
Classification: Outer Main-belt Asteroid          SPK-ID: 2001838
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01452204015855325 1.1658e-08  
a 3.214296604900424 1.4562e-08 au
q 3.167618460522559 4.2715e-08 au
i 21.96959370216912 5.8571e-07 deg
node 44.18048636931466 1.0225e-06 deg
peri 48.5956162046697 6.2962e-05 deg
M 171.7168340608616 6.4415e-05 deg
tp 2458392.490728619572
(2018-Sep-30.99072862)
0.00037561 TDB
period 2104.880046698554
5.76
1.4304e-05
3.916e-08
d
yr
n .1710311238707641 1.1623e-09 deg/d
Q 3.26097474927829 1.4774e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2820  
   data-arc span      24346 days (66.66 yr)  
   first obs. used      1954-10-31  
   last obs. used      2021-06-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40371  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:51:37  

Additional Information
 Earth MOID = 2.1909 au 
 Jupiter MOID = 1.78797 au 
 T_jup = 3.076 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.86   n/a E2021B10  
diameter diameter 40.054 km 0.380 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 16.162 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Gross, J. (2003) Minor Planet Bull. 30, 44-46.]
[Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.057   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1838 Ursa (1971 UC)          Discovered 1971-Oct-20 by Wild, P. at Zimmerwald
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1971 UC = 1951 GB1 = 1954 UA = 1965 UE = 1977 UP1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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