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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1645282999238739 2.2076e-08  
a 2.6563110731374 9.6283e-09 au
q 2.219272728205142 6.1254e-08 au
i 12.17128084460544 8.2716e-07 deg
node 342.770899128278 6.2511e-06 deg
peri 78.7955922209359 9.3814e-06 deg
M 348.3220855438562 8.5648e-06 deg
tp 2459447.795541019941
(2021-Aug-21.29554102)
3.7746e-05 TDB
period 1581.309302832197
4.33
8.5977e-06
2.354e-08
d
yr
n .2276594461028109 1.2378e-09 deg/d
Q 3.093349418069657 1.1212e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2064  
   data-arc span      25561 days (69.98 yr)  
   first obs. used      1951-08-11  
   last obs. used      2021-08-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4347  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:46:17  

Additional Information
 Earth MOID = 1.26842 au 
 Jupiter MOID = 2.34268 au 
 T_jup = 3.337 
[ 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 13.73   n/a MPO636392  
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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