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1808 Bellerophon (2517 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2001808
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1795735765456534 2.7435e-08  
a 2.747537800783928 8.3411e-09 au
q 2.254152611202779 7.6654e-08 au
i 2.024862722979773 3.7515e-06 deg
node 12.99165986766101 9.3423e-05 deg
peri 48.18905375378974 9.4029e-05 deg
M 356.9711328565258 1.0672e-05 deg
tp 2459014.495604602159
(2020-Jun-13.99560460)
4.9325e-05 TDB
period 1663.466047902681
4.55
7.575e-06
2.074e-08
d
yr
n .216415598294833 9.8551e-10 deg/d
Q 3.240922990365076 9.8389e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2886  
   data-arc span      33665 days (92.17 yr)  
   first obs. used      1928-09-15  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45704  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:02:49  

Additional Information
 Earth MOID = 1.26757 au 
 Jupiter MOID = 2.09542 au 
 T_jup = 3.323 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.1   n/a MPO452185  
diameter diameter 15.210 km 0.185 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 3.820 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.146   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1808 Bellerophon (2517 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

Alternate Designations
 2517 P-L = 1928 RY = 1953 ED = 1965 YL = 1972 HQ = 1978 TH9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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