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20931 (2208 T-1)
Classification: Main-belt Asteroid          SPK-ID: 2020931
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1927628176110958 2.7221e-08  
a 2.452404568388129 7.9522e-09 au
q 1.97967215386331 6.807e-08 au
i 8.436785385554979 4.7304e-06 deg
node 14.43546347733183 2.3875e-05 deg
peri 233.8798797249483 2.7272e-05 deg
M 291.200744616385 1.368e-05 deg
tp 2459468.582113476439
(2021-Sep-11.08211348)
5.356e-05 TDB
period 1402.770426996544
3.84
6.823e-06
1.868e-08
d
yr
n .2566350081750667 1.2482e-09 deg/d
Q 2.925136982912949 9.4851e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2079  
   data-arc span      18254 days (49.98 yr)  
   first obs. used      1971-03-24  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4593  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:34:58  

Additional Information
 Earth MOID = .978903 au 
 Jupiter MOID = 2.14486 au 
 T_jup = 3.454 
[ 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 14.28   n/a E2021B10  
diameter diameter 4.538 km 0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.66214 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 0.113   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20931 (2208 T-1)          Discovered 1971-Mar-25 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 2208 T-1 = 1998 FX70 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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