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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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1774948567879872 5.5565e-08  
a 3.104882226894361 1.5516e-08 au
q 2.55378160068818 1.72e-07 au
i 5.339060166746184 5.3063e-06 deg
node 12.48638804904556 3.808e-05 deg
peri 2.048961223122068 3.9328e-05 deg
M 116.1771042159946 9.6727e-06 deg
tp 2458355.612186154931
(2018-Aug-25.11218615)
5.2894e-05 TDB
period 1998.32501034453
5.47
1.4979e-05
4.101e-08
d
yr
n .1801508754263815 1.3504e-09 deg/d
Q 3.655982853100543 1.827e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1720  
   data-arc span      12525 days (34.29 yr)  
   first obs. used      1985-09-21  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53717  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 20:46:55  

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 1.93306067880544 1.93305988284585 1.93306147476503 2.40557743921241 2.21595330200797 2423540.193159212 2.14612060953637 67.8227014962028 12.3515504027591 74.9114085062577 1955245.51160634 T 26 CATAB v2.0f-lin.ifort 2020-Jan-28 20:47:23 2020-Jan-28 20:47
1933-May-24 20:44 00:02 Jupiter 1.82464377929965 1.82464325686372 1.82464430173619 2.25593176817058 2.03980466489906 2427217.363743705 1.86790043033953 151.327768959118 20.1533317701473 89.2466527760598 2109637.24175395 T 26 CATAB v2.0f-lin.ifort 2020-Jan-28 20:47:23 2020-Jan-28 20:47
1994-Jul-02 16:20 < 00:01 Jupiter 1.92199297701945 1.92199250276696 1.92199345127205 2.34820285323955 2.15236066228888 2449536.180257683 0.531759837775369 61.8095508101739 6.27726028308929 79.4293383947615 2469117.38398468 T 26 CATAB v2.0f-lin.ifort 2020-Jan-28 20:47:23 2020-Jan-28 20:47
2004-Jul-25 11:48 < 00:01 Jupiter 1.83338778584531 1.83338726487506 1.83338830681567 2.28356614371609 2.07139499227115 2453211.991937958 0.2993772316719 81.1882928955926 19.5512221801371 88.7620710012922 2241807.42787071 T 26 CATAB v2.0f-lin.ifort 2020-Jan-28 20:47:23 2020-Jan-28 20:47
2065-Sep-02 08:58 00:01 Jupiter 1.90882293027278 1.90882244348343 1.90882341706212 2.2872675731008 2.08425321254009 2475530.873690616 1.19141951565202 62.8262747538991 7.40161847742257 79.5630235551234 2399106.21730243 T 26 CATAB v2.0f-lin.ifort 2020-Jan-28 20:47:23 2020-Jan-28 20:47
2075-Sep-26 21:31 00:01 Jupiter 1.84132779548808 1.84132719770172 1.84132839327571 2.30888832782963 2.10022679006515 2479207.396312449 1.40520312720389 129.884716590005 19.0805103712641 87.6866226993536 2294114.75358514 T 26 CATAB v2.0f-lin.ifort 2020-Jan-28 20:47:23 2020-Jan-28 20:47
2136-Nov-05 00:28 00:03 Jupiter 1.89738794352242 1.89738721391345 1.89738867313139 2.23101509313938 2.02103890725782 2501526.519785808 2.84272681531309 68.3886569408006 11.6883708030328 77.1959651151767 2024821.22512008 T 26 CATAB v2.0f-lin.ifort 2020-Jan-28 20:47:23 2020-Jan-28 20:47
2146-Nov-28 18:15 00:03 Jupiter 1.84793142085341 1.84793063181505 1.84793220989828 2.33247950559586 2.12690751797032 2505202.260146069 3.02344188658314 226.97652371861 18.7744215147767 87.506916334383 2318769.21364474 T 26 CATAB v2.0f-lin.ifort 2020-Jan-28 20:47:23 2020-Jan-28 20:47

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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