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21222 (1995 BT)
Classification: Outer Main-belt Asteroid          SPK-ID: 2021222
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1055459707558434 4.8691e-08  
a 3.23737633635619 2.6254e-08 au
q 2.89568430823348 1.5632e-07 au
i 21.04576145758823 6.917e-06 deg
node 316.4660343100787 1.4218e-05 deg
peri 84.2111618105878 3.5341e-05 deg
M 244.2413669610013 3.2027e-05 deg
tp 2459884.630728441524
(2022-Nov-01.13072844)
0.00019186 TDB
period 2127.591314558591
5.83
2.5881e-05
7.086e-08
d
yr
n .1692054284751998 2.0583e-09 deg/d
Q 3.5790683644789 2.9024e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1008  
   data-arc span      9253 days (25.33 yr)  
   first obs. used      1995-01-23  
   last obs. used      2020-05-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5062  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:41:41  

Additional Information
 Earth MOID = 1.99375 au 
 Jupiter MOID = 1.876 au 
 T_jup = 3.071 
[ 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 13.14   n/a E2021B10  
diameter diameter 12.167 km 0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.020 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 0.083   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21222 (1995 BT)          Discovered 1995-Jan-23 by Kobayashi, T. at Oizumi
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1995 BT = 1998 QY17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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