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JPL Small-Body Database Browser
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20995 (1985 VY)
Classification: Jupiter Trojan          SPK-ID: 2020995
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1140688505064595 6.6178e-08  
a 5.091924372868029 1.0914e-07 au
q 4.511094412789148 3.6049e-07 au
i 20.36827748076958 6.9416e-06 deg
node 72.77714490534969 1.8621e-05 deg
peri 10.80113534482325 3.7878e-05 deg
M 244.0937736343711 3.6671e-05 deg
tp 2459951.718583903356
(2023-Jan-07.21858390)
0.00045604 TDB
period 4196.829673935946
11.49
0.00013493
3.694e-07
d
yr
n .08577903512161797 2.7579e-09 deg/d
Q 5.672754332946909 1.2159e-07 au
  Orbit Determination Parameters
   # obs. used (total)      732  
   data-arc span      12419 days (34.00 yr)  
   first obs. used      1985-11-01  
   last obs. used      2019-11-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58896  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 00:11:23  

Additional Information
 Earth MOID = 3.5288 au 
 Jupiter MOID = .315383 au 
 T_jup = 2.865 
[ 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 11.7   n/a MPO502323  
diameter diameter 26.203 km 2.566 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 10.474 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.065   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

20995 (1985 VY)          Discovered 1985-Nov-01 by West, R. M. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1985 VY = 1999 VB157 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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