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18740 (1998 VH31)
Classification: Main-belt Asteroid          SPK-ID: 2018740
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2086056700186732 3.3896e-08  
a 2.341214402383226 6.5743e-09 au
q 1.852823803316706 8.1556e-08 au
i 1.90716954594086 3.1142e-06 deg
node 62.0745551192235 0.00012406 deg
peri 324.692073100896 0.00012441 deg
M 86.7867053614312 1.0573e-05 deg
tp 2458885.064253015207
(2020-Feb-05.56425301)
3.7776e-05 TDB
period 1308.459267368285
3.58
5.5113e-06
1.509e-08
d
yr
n .2751327526794708 1.1589e-09 deg/d
Q 2.829605001449746 7.9457e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1695  
   data-arc span      23824 days (65.23 yr)  
   first obs. used      1955-10-25  
   last obs. used      2021-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53072  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:39:49  

Additional Information
 Earth MOID = .856453 au 
 Jupiter MOID = 2.62064 au 
 T_jup = 3.534 
[ 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 14.7   n/a MPO296288  
diameter diameter 3.003 km 0.545 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.258   0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18740 (1998 VH31)          Discovered 1998-Nov-14 by Kobayashi, T. at Oizumi
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 VH31 = 1969 RJ = 1987 ST20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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