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3235 Melchior (1981 EL1)
Classification: Main-belt Asteroid          SPK-ID: 2003235
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2450204130698465 4.8806e-08  
a 2.683164632360857 1.119e-08 au
q 2.025734525805397 1.3507e-07 au
i 13.51969317587122 4.6188e-06 deg
node 348.1676615944625 1.6175e-05 deg
peri 168.8103670342028 1.8636e-05 deg
M 14.81839755329347 8.581e-06 deg
tp 2459134.420286827621
(2020-Oct-11.92028683)
3.8087e-05 TDB
period 1605.348800806685
4.40
1.0043e-05
2.75e-08
d
yr
n .2242503310303036 1.4029e-09 deg/d
Q 3.340594738916317 1.3932e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1578  
   data-arc span      22605 days (61.89 yr)  
   first obs. used      1959-03-06  
   last obs. used      2021-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48732  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:08:54  

Additional Information
 Earth MOID = 1.03607 au 
 Jupiter MOID = 1.64901 au 
 T_jup = 3.293 
[ 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 13.78   n/a E2021B10  
diameter diameter 9.233 km 2.135 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.047   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

3235 Melchior (1981 EL1)          Discovered 1981-Mar-06 by Debehogne, H. at La Silla
and G. de Sanctis.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 EL1 = 1959 EX = 1975 WA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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