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49630 (1999 GB21)
Classification: Main-belt Asteroid          SPK-ID: 2049630
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1181706975734493 6.0886e-08  
a 3.198239483923711 2.1903e-08 au
q 2.820301293101498 2.0192e-07 au
i 24.72923387294923 6.4567e-06 deg
node 47.33096701294317 1.0804e-05 deg
peri 124.1964311418007 2.7048e-05 deg
M 277.5550238009253 2.2988e-05 deg
tp 2459478.939021964368
(2021-Sep-21.43902196)
0.00013411 TDB
period 2089.127268243491
5.72
2.1461e-05
5.876e-08
d
yr
n .1723207606699246 1.7702e-09 deg/d
Q 3.576177674745925 2.4491e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1740  
   data-arc span      11375 days (31.14 yr)  
   first obs. used      1989-09-24  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45565  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 21:28:22  

Additional Information
 Earth MOID = 1.88221 au 
 Jupiter MOID = 1.54905 au 
 T_jup = 3.041 
[ 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 12.6   n/a MPO502487  
diameter diameter 22.037 km 0.112 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 78.94 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 0.061   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

49630 (1999 GB21)          Discovered 1999-Apr-15 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 GB21 = 1989 SN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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