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21904 (1999 VV12)
Classification: Main-belt Asteroid          SPK-ID: 2021904
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1067156220679396 1.2585e-08  
a 3.142638411501046 2.0537e-08 au
q 2.807269798483111 4.7235e-08 au
i 21.49097660457416 5.4512e-07 deg
node 73.42511201670351 2.1448e-06 deg
peri 115.3765465860679 9.785e-06 deg
M 162.0287585725312 1.2917e-05 deg
tp 2458284.638817746817
(2018-Jun-15.13881775)
6.8372e-05 TDB
period 2034.885834563457
5.57
1.9947e-05
5.461e-08
d
yr
n .1769141019536512 1.7342e-09 deg/d
Q 3.478007024518983 2.2729e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2297  
   data-arc span      11720 days (32.09 yr)  
   first obs. used      1988-12-06  
   last obs. used      2021-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38146  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:05:28  

Additional Information
 Earth MOID = 1.8681 au 
 Jupiter MOID = 1.7088 au 
 T_jup = 3.094 
[ 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 11.69   n/a E2021B10  
diameter diameter 14.847 km 3.586 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 5.4324 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.]
geometric albedo albedo 0.184   0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21904 (1999 VV12)          Discovered 1999-Nov-11 by Juels, C. W. at Fountain Hills
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 VV12 = 1988 XY 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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