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37546 (1981 ET20)
Classification: Main-belt Asteroid          SPK-ID: 2037546
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1421779499983478 7.2558e-08  
a 2.629165935447882 1.5953e-08 au
q 2.255356512540414 1.9548e-07 au
i 8.987284999710278 6.404e-06 deg
node 356.4977244483292 2.4888e-05 deg
peri 191.1286390706327 3.0194e-05 deg
M 64.99148497661587 1.6697e-05 deg
tp 2458719.388002324507
(2019-Aug-23.88800232)
7.1266e-05 TDB
period 1557.131971974321
4.26
1.4173e-05
3.88e-08
d
yr
n .2311942767083179 2.1043e-09 deg/d
Q 3.00297535835535 1.8222e-08 au
  Orbit Determination Parameters
   # obs. used (total)      745  
   data-arc span      13990 days (38.30 yr)  
   first obs. used      1981-02-02  
   last obs. used      2019-05-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56733  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 04:33:44  

Additional Information
 Earth MOID = 1.25763 au 
 Jupiter MOID = 1.96234 au 
 T_jup = 3.369 
[ 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 15.1   n/a MPO436030  
diameter diameter 3.581 km 0.490 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 24. h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Binzel, R.P.; Xu, S.; Bus, S.J.; Bowell, E. (1992) Icarus 99, 225-237; Science 257, 779-782.]
geometric albedo albedo 0.061   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

37546 (1981 ET20)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20020328/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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