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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 
[ 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 13.7   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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1939-Aug-21 09:43 00:01 Jupiter 1.7479089847354 1.74790798854309 1.74790998093448 3.41040979996646 3.26522759187496 2429496.904587812 1.39801327573513 224.260341543116 28.5815769453904 -78.8992716998501 2699188.8749786 T 31 CATAB v2.0f-lin.ifort 2020-May-20 01:51:24 2020-May-20 01:51
1974-Aug-20 23:01 < 00:01 Jupiter 1.65031482518866 1.65031438581204 1.65031526456584 3.45332432033397 3.30135589749408 2442280.458745345 0.671998051926287 122.944851068564 19.4882106551429 85.8458620796149 2844484.50290812 T 31 CATAB v2.0f-lin.ifort 2020-May-20 01:51:24 2020-May-20 01:51
2009-Aug-16 14:33 < 00:01 Jupiter 1.79519117226341 1.79519077894442 1.79519156558454 3.33359164470308 3.18891456107652 2455060.106010759 0.220956284488433 234.063471213264 16.3434537686622 87.3551855328736 2834618.95202412 T 31 CATAB v2.0f-lin.ifort 2020-May-20 01:51:24 2020-May-20 01:51
2058-Oct-02 10:33 < 00:01 Jupiter 1.94518751276504 1.9451864776091 1.9451885481127 3.19117563025431 3.05167356613621 2473003.939862424 0.923785141859506 1167.78704785743 23.2373182661893 -87.7353900359768 2437123.56263328 T 31 CATAB v2.0f-lin.ifort 2020-May-20 01:51:24 2020-May-20 01:51
2093-Sep-07 14:11 00:01 Jupiter 1.69197694875453 1.69197603243565 1.6919778650764 3.41355832607143 3.26361121422934 2485763.090884412 1.37932036484144 161.25130727583 30.3441435459117 -77.5071859185137 2641436.01112649 T 31 CATAB v2.0f-lin.ifort 2020-May-20 01:51:24 2020-May-20 01:51
2128-Sep-10 23:29 00:02 Jupiter 1.66604956788068 1.66604894764161 1.66605018812978 3.45071049439949 3.30009081939643 2498549.478763155 1.97202042445109 247.438353063903 15.7929888658472 83.4716614183413 2890558.40534293 T 31 CATAB v2.0f-lin.ifort 2020-May-20 01:51:24 2020-May-20 01:51
2163-Aug-29 23:28 00:03 Jupiter 1.89218112364743 1.892178526657 1.89218372105131 3.32462885790396 3.18714136986841 2511320.478111798 2.96974738161888 1470.50563468889 26.5918020497897 84.8188457923796 2755621.65311272 T 31 CATAB v2.0f-lin.ifort 2020-May-20 01:51:24 2020-May-20 01:51

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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