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21954 (1999 VU178)
Classification: Main-belt Asteroid          SPK-ID: 2021954
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09746764585713195 3.5799e-08  
a 2.716020127051035 1.4309e-08 au
q 2.451296039166782 9.8784e-08 au
i 11.93213099428812 4.3586e-06 deg
node 163.876374325101 1.8477e-05 deg
peri 55.06241777266126 2.815e-05 deg
M 82.90774339667377 2.1556e-05 deg
tp 2458823.977878871882
(2019-Dec-06.47787887)
9.7353e-05 TDB
period 1634.92525610775
4.48
1.292e-05
3.537e-08
d
yr
n .2201935523689006 1.7401e-09 deg/d
Q 2.980744214935288 1.5704e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1226  
   data-arc span      11845 days (32.43 yr)  
   first obs. used      1988-03-13  
   last obs. used      2020-08-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54497  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:53:59  

Additional Information
 Earth MOID = 1.46676 au 
 Jupiter MOID = 2.02618 au 
 T_jup = 3.323 
[ 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 14.42   n/a E2021B10  
diameter diameter 8.657 km 0.110 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 115.666 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.050   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21954 (1999 VU178)          Discovered 1999-Nov-06 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 VU178 = 1988 EW = 1988 FC2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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