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22955 (1999 TH251)
Classification: Main-belt Asteroid          SPK-ID: 2022955
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1184261004438798 1.5098e-08  
a 2.775554098900686 1.543e-08 au
q 2.446856050396852 4.8626e-08 au
i 21.68051707510635 8.4525e-07 deg
node 309.0165327612273 2.9013e-06 deg
peri 74.87293688101234 1.0283e-05 deg
M 256.8133822266248 1.2166e-05 deg
tp 2459684.609771349052
(2022-Apr-15.10977135)
5.8628e-05 TDB
period 1688.974030221846
4.62
1.4084e-05
3.856e-08
d
yr
n .2131471494281734 1.7774e-09 deg/d
Q 3.104252147404521 1.7258e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1524  
   data-arc span      9068 days (24.83 yr)  
   first obs. used      1995-10-25  
   last obs. used      2020-08-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44054  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 04:15:04  

Additional Information
 Earth MOID = 1.53259 au 
 Jupiter MOID = 2.4194 au 
 T_jup = 3.223 
[ 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 13.06   n/a E2021B10  
diameter diameter 16.492 km 0.285 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 11.7722 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.046   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

22955 (1999 TH251)          Discovered 1999-Oct-07 by CSS at Catalina
Reference: 20010309/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TH251 = 1998 QJ67 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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