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52251 (1981 EF32)
Classification: Main-belt Asteroid          SPK-ID: 2052251
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06707623470833451 3.8245e-08  
a 2.440148511517013 1.0592e-08 au
q 2.276472537235305 9.4064e-08 au
i 7.732549619859607 4.3076e-06 deg
node 279.3229318585501 3.3638e-05 deg
peri 354.0095832497536 5.2013e-05 deg
M 73.06233691031969 3.9275e-05 deg
tp 2458917.937923330743
(2020-Mar-09.43792333)
0.00015248 TDB
period 1392.267916721463
3.81
9.0648e-06
2.482e-08
d
yr
n .2585709227917385 1.6835e-09 deg/d
Q 2.603824485798722 1.1302e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1075  
   data-arc span      14586 days (39.93 yr)  
   first obs. used      1981-02-08  
   last obs. used      2021-01-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53684  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 10:43:48  

Additional Information
 Earth MOID = 1.25842 au 
 Jupiter MOID = 2.47966 au 
 T_jup = 3.486 
[ 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 15.33   n/a E2021B10  
rotation period rot_per 99.9276 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.]

52251 (1981 EF32)          Discovered 1981-Mar-06 by Bus, S. J. at Siding Spring
Reference: 20030216/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EF32 = 2000 EJ155 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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