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21230 (1995 SK3)
Classification: Main-belt Asteroid          SPK-ID: 2021230
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 .1669888155116981 3.1356e-08  
a 2.459375076172195 8.7781e-09 au
q 2.048686945303208 7.7413e-08 au
i 3.574196253752381 3.631e-06 deg
node 94.43946007300853 6.5112e-05 deg
peri 178.1518346557095 6.6218e-05 deg
M 266.8635572382488 1.3045e-05 deg
tp 2459564.962394280971
(2021-Dec-16.46239428)
5.1685e-05 TDB
period 1408.755349147099
3.86
7.5423e-06
2.065e-08
d
yr
n .2555447262137847 1.3682e-09 deg/d
Q 2.870063207041182 1.0244e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1575  
   data-arc span      10813 days (29.60 yr)  
   first obs. used      1991-08-07  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49217  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:42:00  

Additional Information
 Earth MOID = 1.03058 au 
 Jupiter MOID = 2.23243 au 
 T_jup = 3.469 
[ 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 14.77   n/a E2021B10  
diameter diameter 2.980 km 0.100 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.53876 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:
[McNeill, A.; Mommert, M.; Trilling, D.E.; Llama, J.; Skiff, B. (2019) Ap. J. Suppl. Series 245, id.29.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.288   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21230 (1995 SK3)          Discovered 1995-Sep-23 by Loiano at Loiano
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1995 SK3 = 1998 HP71 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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