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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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1774948727269842 5.0791e-08  
a 3.104882223778393 1.4923e-08 au
q 2.553781548636571 1.5552e-07 au
i 5.339060831313067 4.4866e-06 deg
node 12.48639207036968 3.7307e-05 deg
peri 2.048958596647981 3.8542e-05 deg
M 116.1771036488403 9.6298e-06 deg
tp 2458355.612190273935
(2018-Aug-25.11219027)
5.2509e-05 TDB
period 1998.32500733634
5.47
1.4406e-05
3.944e-08
d
yr
n .1801508756975727 1.2988e-09 deg/d
Q 3.655982898920215 1.7571e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1974  
   data-arc span      12638 days (34.60 yr)  
   first obs. used      1985-09-21  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51071  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:44:36  

Additional Information
 Earth MOID = 1.55472 au 
 Jupiter MOID = 1.8104 au 
 T_jup = 3.190 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456966.5 (2014-Nov-05.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1733286779206713 5.0313e-08  
q 2.573116592732418 1.5328e-07 au
tp 2456355.303237083389
(2013-Mar-03.80323708)
5.4494e-05 TDB
node 12.58091640935841 3.7399e-05 deg
peri 2.217783332422648 3.8713e-05 deg
i 5.329054449581047 4.4755e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1974  
   data-arc span      12638 days (34.60 yr)  
   first obs. used      1985-09-21  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51071  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:44:36  

Additional Information
 Jupiter MOID = 1.8104 au 
 T_jup = 3.190 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.531429026144234E-15 -7.687013503696845E-15 -2.020130426781467E-13 1.544788301911631E-14 -1.475554209366067E-13 -3.607741152941879E-16
q -7.687013503696845E-15 2.349347983748967E-14 4.988842446205112E-13 -5.015756297350401E-14 4.384689298948214E-13 7.442402312321574E-16
tp -2.020130426781467E-13 4.988842446205112E-13 2.9695667405261E-9 -2.472615997952202E-12 5.436854204799962E-10 -1.625211515968095E-12
node 1.544788301911631E-14 -5.015756297350401E-14 -2.472615997952202E-12 1.398720334002885E-9 -1.393611289831645E-9 -2.190926207863981E-11
peri -1.475554209366067E-13 4.384689298948214E-13 5.436854204799962E-10 -1.393611289831645E-9 1.498702804719151E-9 2.153442931038233E-11
i -3.607741152941879E-16 7.442402312321574E-16 -1.625211515968095E-12 -2.190926207863981E-11 2.153442931038233E-11 2.002975112169669E-11

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 1.93306066824126 1.93305987411483 1.93306146236769 2.4055773763372 2.21595323267176 2423540.193234932 2.09683278780699 64.7500129896949 11.9480246667636 74.5013953380482 2076580.58762957 T 28 CATAB v2.0f-lin.ifort 2020-May-20 02:44:48 2020-May-20 02:44
1933-May-24 20:44 00:02 Jupiter 1.82464373312257 1.82464324896239 1.82464421728327 2.2559316387381 2.0398045159932 2427217.363802110 1.83307013429743 145.178811817418 18.2044780183138 89.839021635452 2333489.01549444 T 28 CATAB v2.0f-lin.ifort 2020-May-20 02:44:48 2020-May-20 02:44
1994-Jul-02 16:20 < 00:01 Jupiter 1.92199293891201 1.92199249451577 1.92199338330825 2.34820270673026 2.15236049838915 2449536.180268606 0.524874600091035 58.0208467718038 6.05971544781031 79.5767039812331 2779864.78110173 T 28 CATAB v2.0f-lin.ifort 2020-May-20 02:44:48 2020-May-20 02:44
2004-Jul-25 11:48 < 00:01 Jupiter 1.83338775051966 1.83338725189927 1.83338824914015 2.28356604536388 2.07139487954733 2453211.991937035 0.298893338456661 78.5947669955317 17.6615126537135 -89.7108239707138 2579810.1961644 T 28 CATAB v2.0f-lin.ifort 2020-May-20 02:44:48 2020-May-20 02:44
2065-Sep-02 08:58 00:01 Jupiter 1.90882286758084 1.90882246053838 1.90882327462341 2.28726735032734 2.08425296107524 2475530.873633669 1.15312829420991 58.2137127040871 7.21020161200994 79.954122148871 2896873.35252135 T 28 CATAB v2.0f-lin.ifort 2020-May-20 02:44:48 2020-May-20 02:44
2075-Sep-26 21:31 00:01 Jupiter 1.84132777496057 1.84132718394818 1.84132836597443 2.30888828731063 2.10022674307876 2479207.396246908 1.35213847007214 127.089170421436 17.4152378399657 88.0573204644927 2672285.0150949 T 28 CATAB v2.0f-lin.ifort 2020-May-20 02:44:48 2020-May-20 02:44
2136-Nov-05 00:28 00:03 Jupiter 1.89738785916961 1.89738722147655 1.89738849686277 2.23101482070789 2.02103859670209 2501526.519661984 2.760454947016 63.1871512747996 11.5817149214071 77.2598100821659 2399555.16022171 T 28 CATAB v2.0f-lin.ifort 2020-May-20 02:44:48 2020-May-20 02:44
2146-Nov-28 18:14 00:03 Jupiter 1.84793142008298 1.84793063116951 1.84793220900295 2.33247952714513 2.12690754151255 2505202.260018596 2.92799038313516 221.314195942472 17.1177212840124 87.562511922763 2658590.77923964 T 28 CATAB v2.0f-lin.ifort 2020-May-20 02:44:48 2020-May-20 02:44

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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