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91981 (1999 VB99)
Classification: Outer Main-belt Asteroid          SPK-ID: 2091981
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1057079874467992 4.0063e-08  
a 3.204392796836354 2.2686e-08 au
q 2.865662883293763 1.2762e-07 au
i 4.383387407528399 4.6575e-06 deg
node 218.2092631035631 5.1548e-05 deg
peri 13.76563484663979 5.5293e-05 deg
M 89.27591759682738 2.0286e-05 deg
tp 2458876.924255023132
(2020-Jan-28.42425502)
0.00011748 TDB
period 2095.159290732618
5.74
2.225e-05
6.092e-08
d
yr
n .1718246443563335 1.8247e-09 deg/d
Q 3.543122710378945 2.5084e-08 au
  Orbit Determination Parameters
   # obs. used (total)      969  
   data-arc span      7978 days (21.84 yr)  
   first obs. used      1999-10-03  
   last obs. used      2021-08-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53693  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 02:03:07  

Additional Information
 Earth MOID = 1.85563 au 
 Jupiter MOID = 1.4454 au 
 T_jup = 3.180 
[ 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 14.27   n/a MPCxxxxx  
diameter diameter 8.179 km 0.369 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 8.42 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:
[Chang, C.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) Ap. J. Supp. Ser. 241, A6.]
geometric albedo albedo 0.066   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91981 (1999 VB99)          Discovered 1999-Nov-09 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1999 VB99 = 2000 YG89 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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