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120446 (1981 EF21)
Classification: Main-belt Asteroid          SPK-ID: 2120446
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09434851691483707 5.3733e-08  
a 2.564728891457198 1.4766e-08 au
q 2.322750524259577 1.3962e-07 au
i 9.296453386516172 5.4833e-06 deg
node 169.3177368443291 2.5071e-05 deg
peri 14.56976987698193 3.3671e-05 deg
M 189.6756145845661 2.2456e-05 deg
tp 2459710.298296676239
(2022-May-10.79829668)
9.5402e-05 TDB
period 1500.239593879617
4.11
1.2956e-05
3.547e-08
d
yr
n .2399616711015077 2.0723e-09 deg/d
Q 2.806707258654818 1.6159e-08 au
  Orbit Determination Parameters
   # obs. used (total)      532  
   data-arc span      14116 days (38.65 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-10-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50421  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 14:12:48  

Additional Information
 Earth MOID = 1.32679 au 
 Jupiter MOID = 2.15165 au 
 T_jup = 3.408 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.9   n/a MPO436581  
diameter diameter 3.541 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.17 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Incomplete or inconclusive result.
Published Reference List:
[Erasmus, N.; McNeill, A.; Mommert, M.; Trilling, D.E.; et al. (2018) Ap. J. Suppl. Series 237, A19.]
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.067   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

120446 (1981 EF21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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