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2247 Hiroshima (6512 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2002247
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1109154032455593 4.2027e-08  
a 2.448310757286343 8.07e-09 au
q 2.176755382371488 1.021e-07 au
i 5.941588482644399 4.2367e-06 deg
node 7.379501710639208 2.8677e-05 deg
peri 29.39971407464495 3.1977e-05 deg
M 176.7226060898706 1.5718e-05 deg
tp 2458313.608970671330
(2018-Jul-14.10897067)
5.9391e-05 TDB
period 1399.259415813329
3.83
6.9183e-06
1.894e-08
d
yr
n .2572789548039223 1.272e-09 deg/d
Q 2.719866132201199 8.9651e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2301  
   data-arc span      23798 days (65.16 yr)  
   first obs. used      1955-05-23  
   last obs. used      2020-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4491  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:11:19  

Additional Information
 Earth MOID = 1.18537 au 
 Jupiter MOID = 2.68235 au 
 T_jup = 3.481 
[ 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 13.5   n/a MPO431520  
diameter diameter 4.367 km 0.098 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.470   0.097 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

2247 Hiroshima (6512 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

[ show close-approach data ]
Alternate Designations
 6512 P-L = 1977 AR1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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