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JPL Small-Body Database Browser
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1812 Gilgamesh (4645 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2001812
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08353593759792104 2.9059e-08  
a 3.005138717637925 1.189e-08 au
q 2.754101637248227 8.5883e-08 au
i 10.27339162659555 3.9338e-06 deg
node 178.561053841376 1.824e-05 deg
peri 262.3259501169675 3.0562e-05 deg
M 90.06477431947879 2.3813e-05 deg
tp 2458524.455362779975
(2019-Feb-09.95536278)
0.00012577 TDB
period 1902.809069296082
5.21
1.1293e-05
3.092e-08
d
yr
n .1891939689635687 1.1228e-09 deg/d
Q 3.256175798027623 1.2883e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2845  
   data-arc span      32613 days (89.29 yr)  
   first obs. used      1931-01-13  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45253  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:30:44  

Additional Information
 Earth MOID = 1.79339 au 
 Jupiter MOID = 1.97902 au 
 T_jup = 3.222 
[ 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 11.5   n/a MPO340706  
diameter diameter 15.317 km 0.145 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.227   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1812 Gilgamesh (4645 P-L)          Discovered 1960-Sep-24 by PLS at Palomar
These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 4645 P-L = 1931 BD = 1966 WA = 1973 GF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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