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2493 Elmer (1978 XC)
Classification: Main-belt Asteroid          SPK-ID: 2002493
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1688444108657418 3.5927e-08  
a 2.789504428514536 1.1063e-08 au
q 2.318512196674621 1.0205e-07 au
i 8.72665871704611 3.8238e-06 deg
node 205.8507884219307 2.4252e-05 deg
peri 147.9052167786519 2.6289e-05 deg
M 38.37701690761249 9.9309e-06 deg
tp 2458819.091462373057
(2019-Dec-01.59146237)
4.6827e-05 TDB
period 1701.723552482403
4.66
1.0123e-05
2.772e-08
d
yr
n .2115502247558642 1.2584e-09 deg/d
Q 3.260496660354451 1.293e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2382  
   data-arc span      23871 days (65.36 yr)  
   first obs. used      1954-08-31  
   last obs. used      2020-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49462  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 18:36:41  

Additional Information
 Earth MOID = 1.31967 au 
 Jupiter MOID = 2.2293 au 
 T_jup = 3.292 
[ 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 12.7   n/a MPO350819  
diameter diameter 7.401 km 0.282 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.322   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

2493 Elmer (1978 XC)          Discovered 1978-Dec-01 by Harvard College at Agassiz Station
Discovered at Oak Ridge Observatory (until 1981 Harvard College's Agassiz Station). The principal observers are R. E. McCrosky, C.-Y. Shao, G. Schwartz, and J. H. Bulger, with some assistance from others.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1978 XC = 1954 QG = 1968 QY 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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