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99907 (1989 VA)
Classification: Aten [NEO]          SPK-ID: 2099907
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 153 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5946704254437205 9.757e-08  
a .72837663953216 3.2456e-09 au
q .295232593418303 7.1783e-08 au
i 28.7986074803295 1.4921e-05 deg
node 225.5941937769591 5.2346e-06 deg
peri 2.854731571561528 1.2997e-05 deg
M 181.8726878704764 3.6015e-05 deg
tp 2459312.846734528378
(2021-Apr-08.34673453)
2.2974e-05 TDB
period 227.0557161992487
0.62
1.5176e-06
4.155e-09
d
yr
n 1.585513925947975 1.0597e-08 deg/d
Q 1.161520685646017 5.1756e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] 1.293015803476156E-14 3.201E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      882  
   data-arc span      11436 days (31.31 yr)  
   first obs. used      1989-11-02  
   last obs. used      2021-02-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41877  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-23 05:20:05  

Additional Information
 Earth MOID = .154431 au 
 Jupiter MOID = 3.82678 au 
 T_jup = 7.671 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ 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 17.9   n/a MPO251027  
diameter diameter 1.4 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15)
rotation period rot_per 2.5246 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L.; Mottola, S.; et al. (1997) Icarus 130, 275-286.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
[Oey, J. (2020) Minor Planet Bull. 47, 136-140.]
SMASSII spectral type spec_B Sq   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

99907 (1989 VA)          Discovered 1989-Nov-02 by Shoemaker, C. S. at Palomar
Reference: 20050622/Numbers.arcLast Updated: 2005-06-27

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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