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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 ]

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Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1581170411092551 5.476e-08  
a 2.250441364413494 1.4292e-08 AU
q 1.894608234682558 1.2157e-07 AU
i 5.174715441753505 6.4043e-06 deg
node 59.0779610563608 7.2841e-05 deg
peri 213.9787856420276 7.6651e-05 deg
M 239.9396721118684 2.8594e-05 deg
tp 2457211.741565668695
(2015-Jul-08.24156567)
9.9716e-05 JED
period 1233.104775281605
3.38
1.1747e-05
3.216e-08
d
yr
n .2919459945468029 2.7812e-09 deg/d
Q 2.606274494144431 1.6552e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      954  
   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      .5527  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Apr-17 14:16:25  

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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