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21910 (1999 VT23)
Classification: Main-belt Asteroid          SPK-ID: 2021910
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1922628346919932 1.909e-08  
a 2.267466395396509 6.0001e-09 au
q 1.83151687864874 4.4133e-08 au
i 6.532093021261205 9.3918e-07 deg
node 149.0789409483193 5.8348e-06 deg
peri 164.0453302769813 7.2768e-06 deg
M 131.9227892657327 7.5029e-06 deg
tp 2458743.488592901040
(2019-Sep-16.98859290)
2.5199e-05 TDB
period 1247.124226764369
3.41
4.9502e-06
1.355e-08
d
yr
n .2886641060081164 1.1458e-09 deg/d
Q 2.703415912144278 7.1537e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2260  
   data-arc span      25408 days (69.56 yr)  
   first obs. used      1951-08-11  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48728  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:55:01  

Additional Information
 Earth MOID = .816729 au 
 Jupiter MOID = 2.58496 au 
 T_jup = 3.582 
[ 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 13.7   n/a MPO344475  
diameter diameter 5.658 km 1.729 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
rotation period rot_per 9.4 h n/a LCDB (Rev. 2020-October); 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:
[Higgins, D.J. (2012) http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm]
geometric albedo albedo 0.165   0.135 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

21910 (1999 VT23)          Discovered 1999-Nov-14 by Juels, C. W. at Fountain Hills
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 VT23 = 1975 TN2 = 1975 VX5 = 1978 LN = 1978 NL8 = 1998 HE132 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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