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20261 (1998 FM12)
Classification: Main-belt Asteroid          SPK-ID: 2020261
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2156810728146287 2.8351e-08  
a 2.563712555325574 7.3355e-09 au
q 2.010768281004621 7.3361e-08 au
i 3.995443056781154 2.8109e-06 deg
node 158.874420646505 5.5932e-05 deg
peri 139.4645510360365 5.6476e-05 deg
M 97.59558460857892 8.9533e-06 deg
tp 2458794.028508214437
(2019-Nov-06.52850821)
3.6564e-05 TDB
period 1499.347922651204
4.10
6.4351e-06
1.762e-08
d
yr
n .2401043777507186 1.0305e-09 deg/d
Q 3.116656829646526 8.9176e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1976  
   data-arc span      9276 days (25.40 yr)  
   first obs. used      1995-09-20  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47779  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:16:14  

Additional Information
 Earth MOID = .995166 au 
 Jupiter MOID = 2.1188 au 
 T_jup = 3.397 
[ 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 14.32   n/a E2021B10  
diameter diameter 6.205 km 0.097 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.55 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
geometric albedo albedo 0.105   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20261 (1998 FM12)          Discovered 1998-Mar-19 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 FM12 = 1995 SS42 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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