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123946 (2001 ER23)
Classification: Main-belt Asteroid          SPK-ID: 2123946
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1600484558915073 4.9074e-08  
a 3.179804027969736 2.9461e-08 au
q 2.670881303255584 1.5751e-07 au
i 4.259216507399436 7.1166e-06 deg
node 191.6315657004021 7.2021e-05 deg
peri 39.62971168913336 7.5242e-05 deg
M 92.09530515507328 2.4133e-05 deg
tp 2458470.673166061852
(2018-Dec-18.17316606)
0.00013564 TDB
period 2071.089942061245
5.67
2.8783e-05
7.88e-08
d
yr
n .1738215191377499 2.4157e-09 deg/d
Q 3.688726752683887 3.4176e-08 au
  Orbit Determination Parameters
   # obs. used (total)      485  
   data-arc span      7949 days (21.76 yr)  
   first obs. used      1998-10-23  
   last obs. used      2020-07-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56837  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 10:22:49  

Additional Information
 Earth MOID = 1.66226 au 
 Jupiter MOID = 1.30611 au 
 T_jup = 3.175 
[ 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 14.7   n/a MPO264171  
rotation period rot_per 3.47 h n/a LCDB (Rev. 2019-August); 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:
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]

123946 (2001 ER23)          Discovered 2001-Mar-15 by NEAT at Haleakala
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 2001 ER23 = 1998 UM14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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