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30855 (1991 VQ9)
Classification: Main-belt Asteroid          SPK-ID: 2030855
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .124659389258977 4.9977e-08  
a 2.283153252273534 8.7538e-09 au
q 1.998536762260469 1.1465e-07 au
i 2.012535857300485 4.1252e-06 deg
node 133.6014528116527 0.00017501 deg
peri 198.3366436879081 0.00017637 deg
M 216.90915165491 2.2438e-05 deg
tp 2459701.353116049521
(2022-May-01.85311605)
7.9175e-05 TDB
period 1260.08842538262
3.45
7.247e-06
1.984e-08
d
yr
n .285694236014181 1.6431e-09 deg/d
Q 2.567769742286601 9.8451e-09 au
  Orbit Determination Parameters
   # obs. used (total)      473  
   data-arc span      10731 days (29.38 yr)  
   first obs. used      1991-11-04  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5579  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 04:31:58  

Additional Information
 Earth MOID = .98605 au 
 Jupiter MOID = 2.74258 au 
 T_jup = 3.593 
[ 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 16.59   n/a E2021B10  
diameter diameter 2.366 km 0.540 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.079   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30855 (1991 VQ9)          Discovered 1991-Nov-04 by Spacewatch at Kitt Peak
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 VQ9 = 1998 XF25 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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