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21911 (1999 VW23)
Classification: Main-belt Asteroid          SPK-ID: 2021911
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1702814528243256 1.3737e-08  
a 2.778906843537737 1.2053e-08 au
q 2.30571054895667 4.1362e-08 au
i 9.490762497228292 1.21e-06 deg
node 169.6418506524876 1.0694e-06 deg
peri 219.7427198910742 6.7922e-06 deg
M 217.0390766191202 9.5004e-06 deg
tp 2459872.430342642775
(2022-Oct-19.93034264)
4.7094e-05 TDB
period 1692.035261320584
4.63
1.1008e-05
3.014e-08
d
yr
n .2127615234915556 1.3842e-09 deg/d
Q 3.252103138118803 1.4105e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2082  
   data-arc span      17803 days (48.74 yr)  
   first obs. used      1971-10-21  
   last obs. used      2020-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45341  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:05:34  

Additional Information
 Earth MOID = 1.31738 au 
 Jupiter MOID = 2.2288 au 
 T_jup = 3.293 
[ 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 13.21   n/a E2021B10  
diameter diameter 6.374 km 0.284 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.29159 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 0.274   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21911 (1999 VW23)          Discovered 1999-Nov-14 by Juels, C. W. at Fountain Hills
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 VW23 = 1971 UW2 = 1996 AM12 = 1998 MJ45 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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