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21955 (1999 VW178)
Classification: Main-belt Asteroid          SPK-ID: 2021955
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1141708016246201 3.07e-08  
a 2.793810024727414 1.2014e-08 au
q 2.474838494617386 8.7722e-08 au
i 14.28165049329925 3.8931e-06 deg
node 172.2019206944128 1.2805e-05 deg
peri 46.67874782604873 2.0516e-05 deg
M 14.7283395295227 1.6278e-05 deg
tp 2459130.717741631644
(2020-Oct-08.21774163)
7.7032e-05 TDB
period 1705.664984314925
4.67
1.1002e-05
3.012e-08
d
yr
n .211061376829866 1.3614e-09 deg/d
Q 3.112781554837443 1.3385e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1901  
   data-arc span      11699 days (32.03 yr)  
   first obs. used      1988-06-13  
   last obs. used      2020-06-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47753  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:53:59  

Additional Information
 Earth MOID = 1.49158 au 
 Jupiter MOID = 1.89633 au 
 T_jup = 3.273 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.66   n/a E2021B10  
diameter diameter 4.935 km 0.259 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.716 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.]
geometric albedo albedo 0.661   0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21955 (1999 VW178)          Discovered 1999-Nov-06 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 VW178 = 1992 EP15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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