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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 ]

[ show orbit diagram ]
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
(2018-Aug-25.11218743)
5.2645e-05 TDB
period 1998.325009357622
5.47
1.4576e-05
3.991e-08
d
yr
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 
[ 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 13.1   n/a MPO502222  
diameter diameter 13.074 km 0.360 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.071   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

[ 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
1923-Apr-30 16:38 00:02 Jupiter 1.93306067504137 1.93305988042366 1.93306146965908 2.4055773480734 2.21595320268496 2423540.193176125 2.11110404247055 65.9921980284085 12.0715250432895 74.6721165656229 2032148.57044737 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 18:25:59 2020-Feb-22 18:26
1933-May-24 20:44 00:02 Jupiter 1.82464376431468 1.82464326950442 1.82464425912547 2.2559316781434 2.03980456346409 2427217.363757951 1.84316185029883 147.137355066551 18.7231860758089 89.6417334329646 2266033.31080751 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 18:25:59 2020-Feb-22 18:26
1994-Jul-02 16:20 < 00:01 Jupiter 1.92199296424168 1.92199251113231 1.92199341735115 2.34820274573197 2.15236054363801 2449536.180256488 0.526760884503025 59.5084866302356 6.117128917184 79.5107835541129 2674472.94048205 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 18:25:59 2020-Feb-22 18:26
2004-Jul-25 11:48 < 00:01 Jupiter 1.83338777450858 1.83338726987867 1.8333882791387 2.28356605382582 2.07139489179434 2453211.991939018 0.299078854106622 79.6760454031228 18.1832903709924 89.7578864541975 2462826.97826406 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 18:25:59 2020-Feb-22 18:26
2065-Sep-02 08:58 00:01 Jupiter 1.90882290938755 1.90882247798278 1.90882334079243 2.28726744472414 2.08425306932959 2475530.873668293 1.16455105838129 59.9423671831901 7.26726614358063 79.7929840834373 2718996.69985552 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 18:25:59 2020-Feb-22 18:26
2075-Sep-26 21:31 00:01 Jupiter 1.84132778921723 1.84132719651697 1.84132838191886 2.30888829464556 2.10022675283827 2479207.396277111 1.36789443309704 128.129284565355 17.8413735371606 87.9216950585158 2540702.63107999 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 18:25:59 2020-Feb-22 18:26
2136-Nov-05 00:28 00:03 Jupiter 1.89738791602101 1.89738725065292 1.89738858138921 2.23101495823069 2.02103875513119 2501526.519747863 2.78476045946723 65.0551817079421 11.6060423022692 77.223497535134 2264700.7691485 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 18:25:59 2020-Feb-22 18:26
2146-Nov-28 18:15 00:03 Jupiter 1.84793142005127 1.84793063111438 1.84793220899467 2.33247944505117 2.12690745148026 2505202.260112339 2.95614137935675 223.105526657818 17.5399356046716 87.5364162169004 2543826.87327685 T 27 CATAB v2.0f-lin.ifort 2020-Feb-22 18:25:59 2020-Feb-22 18:26

Alternate Designations
 1985 VD1 = 1990 OL1 = 1999 FS59 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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