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JPL Small-Body Database Browser
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7279 Hagfors (1985 VD1)
Classification: Main-belt Asteroid          SPK-ID: 2007279
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1774948617244944 5.2152e-08  
a 3.104882225872095 1.5098e-08 au
q 2.553781584520087 1.6025e-07 au
i 5.339059846135067 4.7299e-06 deg
node 12.48638746631731 3.7709e-05 deg
peri 2.048962227027426 3.8946e-05 deg
M 116.1771040431509 9.6456e-06 deg
tp 2458355.612187432858
5.2645e-05 TDB
period 1998.325009357622
n .1801508755153522 1.314e-09 deg/d
Q 3.655982867224102 1.7778e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1851  
   data-arc span      12555 days (34.37 yr)  
   first obs. used      1985-09-21  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52095  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:25:49  

Additional Information
 Earth MOID = 1.55472 au 
 Jupiter MOID = 1.8104 au 
 T_jup = 3.190 
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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 13.1   n/a MPO502222  
diameter diameter 13.074 km 0.360 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.071   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

7279 Hagfors           Discovered 1985 Nov. 7 by E. Bowell at the Anderson Mesa Station of Lowell Observatory.
Named in honor of Tor Hagfors (b. 1930), in celebration of his 68th birthday and his retirement as director of the Max-Planck-Institut für Aeronomie. In the 1960s, at the Massachusetts Institute of Technology's Lincoln Laboratory, Hagfors conducted extensive radar investigations of the moon. The radar backscattering function now called the Hagfors Law, which he derived to support his analysis of lunar echoes, remains the most widely applied model for interpreting quasispecular echoes from the moon, Mercury, Mars and Venus. Hagfors served as director of operations of the National Astronomy and Ionosphere Center's Arecibo Observatory from 1971 to 1973 and as director of NAIC during the time, 1982-1992, when Arecibo conducted 68 successful radar experiments on minor planets.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990402/MPCPages.arcLast Updated: 2010-06-11

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Alternate Designations
 1985 VD1 = 1990 OL1 = 1999 FS59 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Mar-29 10:09 UT
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