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21912 (1999 VL24)
Classification: Main-belt Asteroid          SPK-ID: 2021912
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1645883338262629 2.2128e-08  
a 2.656834011735273 9.7983e-09 au
q 2.219550128490819 6.1491e-08 au
i 12.17065598542955 8.2717e-07 deg
node 342.7699490508503 6.2551e-06 deg
peri 78.72368287469271 9.3974e-06 deg
M 303.7685207170514 8.4948e-06 deg
tp 2459447.571167934088
(2021-Aug-21.07116793)
3.7941e-05 TDB
period 1581.776285996503
4.33
8.7503e-06
2.396e-08
d
yr
n .2275922348735958 1.259e-09 deg/d
Q 3.094117894979727 1.1411e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2013  
   data-arc span      25364 days (69.44 yr)  
   first obs. used      1951-08-11  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43587  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:05:36  

Additional Information
 Earth MOID = 1.26835 au 
 Jupiter MOID = 2.34228 au 
 T_jup = 3.336 
[ 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 13.74   n/a E2021B10  
diameter diameter 5.935 km 0.216 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 15.1111 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.347   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21912 (1999 VL24)          Discovered 1999-Nov-15 by Juels, C. W. at Fountain Hills
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 VL24 = 1990 RX4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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