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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2451225917321428 5.3564e-08  
a 2.683466282439638 1.2142e-08 au
q 2.025688072462215 1.4898e-07 au
i 13.51889837964957 4.6318e-06 deg
node 348.1697390971007 1.6388e-05 deg
peri 168.8239738871543 1.882e-05 deg
M 329.9647926189675 8.6846e-06 deg
tp 2459134.458654012462
(2020-Oct-11.95865401)
3.9153e-05 TDB
period 1605.619526201139
4.40
1.0898e-05
2.984e-08
d
yr
n .2242125199185589 1.5218e-09 deg/d
Q 3.341244492417061 1.5118e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1490  
   data-arc span      22331 days (61.14 yr)  
   first obs. used      1959-03-06  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48963  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:51:18  

Additional Information
 Earth MOID = 1.03625 au 
 Jupiter MOID = 1.64914 au 
 T_jup = 3.293 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456876.5 (2014-Aug-07.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2454001466523157 5.3735e-08  
q 2.024551320379139 1.4949e-07 au
tp 2457530.417868639761
(2016-May-21.91786864)
3.5243e-05 TDB
node 348.1879435010207 1.6379e-05 deg
peri 168.9832794644047 1.8781e-05 deg
i 13.52455572565094 4.6332e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1490  
   data-arc span      22331 days (61.14 yr)  
   first obs. used      1959-03-06  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48963  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:51:18  

Additional Information
 Jupiter MOID = 1.64914 au 
 T_jup = 3.293 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.887402086293679E-15 -8.02238396032373E-15 1.056319623924745E-13 -9.154670024358589E-16 2.139984554896142E-13 -7.996543005190182E-15
q -8.02238396032373E-15 2.2347692213218E-14 -2.167811078514389E-13 2.446956216365312E-15 -5.851198229946435E-13 2.310504468450607E-14
tp 1.056319623924745E-13 -2.167811078514389E-13 1.242044269246686E-9 4.671969585669872E-12 3.084172095656691E-10 6.060727497862489E-12
node -9.154670024358589E-16 2.446956216365312E-15 4.671969585669872E-12 2.682593168447412E-10 -2.59556499652157E-10 5.634522705717965E-12
peri 2.139984554896142E-13 -5.851198229946435E-13 3.084172095656691E-10 -2.59556499652157E-10 3.527309776849048E-10 -4.590698088782179E-12
i -7.996543005190182E-15 2.310504468450607E-14 6.060727497862489E-12 5.634522705717965E-12 -4.590698088782179E-12 2.146663969779302E-11

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 13.7   n/a MPO412191  
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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