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6645 Arcetri (1991 AR1)
Classification: Main-belt Asteroid          SPK-ID: 2006645
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1998246918057568 3.3716e-08  
a 3.129270585903593 1.4979e-08 au
q 2.503965055498587 1.0494e-07 au
i .7889127027650459 4.5727e-06 deg
node 24.64754049721875 0.00028818 deg
peri 29.84562161343559 0.00028845 deg
M 133.2654862152408 1.1707e-05 deg
tp 2458252.023290042108
(2018-May-13.52329004)
6.444e-05 TDB
period 2021.91597567612
5.54
1.4518e-05
3.975e-08
d
yr
n .178048941860513 1.2784e-09 deg/d
Q 3.754576116308598 1.7973e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1982  
   data-arc span      15131 days (41.43 yr)  
   first obs. used      1978-08-31  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55125  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:08:17  

Additional Information
 Earth MOID = 1.51552 au 
 Jupiter MOID = 1.6173 au 
 T_jup = 3.182 
[ 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 13.0   n/a MPO473858  
diameter diameter 11.894 km 0.687 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.125   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6645 Arcetri           Discovered 1991 Jan. 11 by E. F. Helin at Palomar.
Named for the Florence Observatory, moved in 1872 from the center of the city to Arcetri, near the house in which Galileo died. The original observatory, La Specola, was also associated with Galileo, and nineteenth-century directors included the comet hunters Pons, Donati and Tempel. It was Donati who moved the observatory to its present location.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19961026/MPCPages.arcLast Updated: 2003-09-26

[ 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
1960-Aug-28 02:34 00:01 Jupiter 1.71486820622834 1.71486762281616 1.71486878963994 1.83543844270514 1.54304147801535 2437174.607065744 1.40557531557021 59.4925064836808 39.322990469515 85.1226766480657 1572329.62492077 T 30 CATAB v2.0f-lin.ifort 2020-Feb-22 18:08:30 2020-Feb-22 18:08
1971-Jan-19 08:55 00:01 Jupiter 1.67317009678107 1.67316973686694 1.67317045669482 1.38655191955348 0.953965380857916 2440970.871425106 1.06286886023964 136.107972660803 99.9804901600225 -21.5935762430389 2400713.04884205 T 30 CATAB v2.0f-lin.ifort 2020-Feb-22 18:08:30 2020-Feb-22 18:08
1981-Jun-16 02:58 < 00:01 Jupiter 1.94605433294291 1.94605377138856 1.94605489449727 2.3234324197129 2.12787118405973 2444771.623810659 0.766338368668989 57.74322335028 5.11639422575083 85.7000502306375 2565530.99689003 T 30 CATAB v2.0f-lin.ifort 2020-Feb-22 18:08:30 2020-Feb-22 18:08
2044-Aug-16 19:11 < 00:01 Jupiter 1.86677683852297 1.8667762750387 1.86677740200714 2.7398773613724 2.56894090838439 2467844.299154989 0.75996582775816 43.4020257841019 13.6719735581933 88.1571377320173 2198660.36920853 T 30 CATAB v2.0f-lin.ifort 2020-Feb-22 18:08:30 2020-Feb-22 18:08
2054-Dec-30 14:14 00:01 Jupiter 1.64739294554538 1.64739263743067 1.64739325365962 1.45171172422017 1.03882057841639 2471632.093171889 1.03495063858007 100.010224501836 86.4412027651215 10.3013310795043 2536045.28912053 T 30 CATAB v2.0f-lin.ifort 2020-Feb-22 18:08:30 2020-Feb-22 18:08
2065-May-24 20:35 00:01 Jupiter 1.77411449178444 1.77411375234044 1.77411523122834 1.67311530578847 1.35810415538645 2475430.357359821 1.33755936416562 102.09976450329 40.5464119839282 -65.6033767079241 2082022.27358427 T 30 CATAB v2.0f-lin.ifort 2020-Feb-22 18:08:30 2020-Feb-22 18:08
2138-Dec-17 11:04 00:03 Jupiter 1.7190205609628 1.71901955903392 1.71902156288991 1.94750514812801 1.67550148670586 2502298.961197648 3.17558170877146 61.7929436024581 46.821610595573 -49.1203190830113 880951.90709118 T 30 CATAB v2.0f-lin.ifort 2020-Feb-22 18:08:30 2020-Feb-22 18:08
2149-May-07 06:37 00:03 Jupiter 1.64916994356995 1.64916920647664 1.64917068066186 1.35840900407106 0.904469076607138 2506092.775873879 3.39181134633499 183.291495691157 107.097455995044 -3.66471641742518 1747633.85219165 T 30 CATAB v2.0f-lin.ifort 2020-Feb-22 18:08:30 2020-Feb-22 18:08
2159-Oct-01 18:49 00:04 Jupiter 1.91705676212313 1.91705491280902 1.91705861144127 2.19837115849999 1.98725087002128 2509892.284256050 3.68731593069344 194.841515742889 3.26229372877596 86.7240647182412 2296155.22763015 T 30 CATAB v2.0f-lin.ifort 2020-Feb-22 18:08:30 2020-Feb-22 18:08

Alternate Designations
 1991 AR1 = 1978 QJ1 = 1978 SR3 = 1984 UC3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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