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136743 Echigo (1995 WW1)
Classification: Main-belt Asteroid          SPK-ID: 2136743
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2328945356204636 3.782e-08  
a 2.340154486471128 1.0833e-08 au
q 1.79514529406429 9.0113e-08 au
i 1.252535553984242 4.5826e-06 deg
node 244.5178769632153 0.00030379 deg
peri 161.972172325328 0.00030429 deg
M 314.1808743593095 2.1305e-05 deg
tp 2459166.921532245078
(2020-Nov-13.42153224)
7.8252e-05 TDB
period 1307.570818309598
3.58
9.0795e-06
2.486e-08
d
yr
n .2753196958505091 1.9118e-09 deg/d
Q 2.885163678877966 1.3356e-08 au
  Orbit Determination Parameters
   # obs. used (total)      454  
   data-arc span      8571 days (23.47 yr)  
   first obs. used      1995-11-16  
   last obs. used      2019-05-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52634  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 05:40:49  

Additional Information
 Earth MOID = .804866 au 
 Jupiter MOID = 2.51096 au 
 T_jup = 3.528 
[ 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 16.6   n/a MPO436674  
rotation period rot_per 4.35 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, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]

136743 Echigo           Discovered 1995 Nov. 16 by N. Sato and T. Urata at Chichibu.
Echigo is a name of an old administrative area in Japan. It was part of the main island of the present Niigata Prefecture, along the coast of the Sea of Japan.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-05-14Last Updated: 2014-05-15

[ show close-approach data ]
Alternate Designations
 1995 WW1 = 2000 DX31 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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