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

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .158220239140467 2.7726e-08  
a 2.250270631192279 6.6016e-09 au
q 1.894232273794267 6.2849e-08 au
i 5.173929358916426 3.6219e-06 deg
node 59.05020145111128 3.9966e-05 deg
peri 214.0272953877337 4.3273e-05 deg
M 220.8357514408174 1.9047e-05 deg
tp 2459677.123809168990
(2022-Apr-07.62380917)
6.6195e-05 TDB
period 1232.964450836426
3.38
5.4257e-06
1.485e-08
d
yr
n .2919792211006417 1.2849e-09 deg/d
Q 2.606308988590291 7.6461e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1912  
   data-arc span      9342 days (25.58 yr)  
   first obs. used      1995-08-16  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4912  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:41:55  

Additional Information
 Earth MOID = .87888 au 
 Jupiter MOID = 2.49189 au 
 T_jup = 3.606 
[ 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 14.56   n/a E2021B10  
diameter diameter 3.759 km 0.262 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.217   0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

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