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21227 (1995 QS)
Classification: Main-belt Asteroid          SPK-ID: 2021227
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1581170737562721 5.2971e-08  
a 2.250441364310067 1.4154e-08 AU
q 1.894608161125287 1.1713e-07 AU
i 5.174715230403332 5.9493e-06 deg
node 59.07801174513651 6.8898e-05 deg
peri 213.9787349922854 7.2355e-05 deg
M 239.9396699472066 2.6825e-05 deg
tp 2457211.741573054942
(2015-Jul-08.24157305)
9.3699e-05 JED
period 1233.104775196597
3.38
1.1633e-05
3.185e-08
d
yr
n .291945994566929 2.7542e-09 deg/d
Q 2.606274567494848 1.6392e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      955  
   data-arc span      6793 days (18.60 yr)  
   first obs. used      1995-08-16  
   last obs. used      2014-03-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54017  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:56:22  

Additional Information
 Earth MOID = .880689 AU 
 T_jup = 3.606 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.4 mag n/a PDS3 (MPO 8681)  

21227 (1995 QS)          Discovered 1995-Aug-16 by Shimizu, Y., Urata, T. at Nachi-Katsuura (905)
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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