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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1069242945844348 1.2561e-08  
a 3.14203376913354 2.0349e-08 au
q 2.806074024808464 4.7022e-08 au
i 21.49203595337156 5.4524e-07 deg
node 73.4182241762192 2.1448e-06 deg
peri 115.2867269179992 9.7664e-06 deg
M 196.8272423142423 1.3085e-05 deg
tp 2460318.561421842755
(2024-Jan-09.06142184)
7.9462e-05 TDB
period 2034.298595986559
5.57
1.9763e-05
5.411e-08
d
yr
n .1769651715388485 1.7192e-09 deg/d
Q 3.477993513458618 2.2525e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2306  
   data-arc span      11931 days (32.67 yr)  
   first obs. used      1988-12-06  
   last obs. used      2021-08-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3833  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:46:16  

Additional Information
 Earth MOID = 1.86865 au 
 Jupiter MOID = 1.70824 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

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