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JPL Small-Body Database Browser
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312984 (1999 SH21)
Classification: Main-belt Asteroid          SPK-ID: 2312984
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2388981915163007 6.0122e-08  
a 2.330413241112956 2.2132e-08 au
q 1.77368173232543 1.4762e-07 au
i 5.46685210056115 9.3418e-06 deg
node 6.091373059407315 5.3662e-05 deg
peri 264.3964881617188 5.738e-05 deg
M 262.8197808011352 2.3182e-05 deg
tp 2458951.270619097010
(2020-Apr-11.77061910)
8.585e-05 TDB
period 1299.414880064386
3.56
1.851e-05
5.068e-08
d
yr
n .2770477739812876 3.9466e-09 deg/d
Q 2.887144749900482 2.7419e-08 au
  Orbit Determination Parameters
   # obs. used (total)      175  
   data-arc span      7068 days (19.35 yr)  
   first obs. used      1999-09-30  
   last obs. used      2019-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57746  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 13:32:59  

Additional Information
 Earth MOID = .767738 au 
 Jupiter MOID = 2.2535 au 
 T_jup = 3.527 
[ 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 17.1   n/a MPO427651  

312984 (1999 SH21)          Discovered 1999-Sep-30 by Spacewatch at Kitt Peak
Reference: 20120207/Numbers.arcLast Updated: 2012-02-09

[ show close-approach data ]
Alternate Designations
 1999 SH21 = 2006 SX103 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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