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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 ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1997679259952887 3.403e-08  
a 3.130556332158606 1.5404e-08 au
q 2.505171586471863 1.0621e-07 au
i .7887264426335604 4.6214e-06 deg
node 24.65618733119653 0.00029455 deg
peri 29.95915662282108 0.00029483 deg
M 61.93296498439469 1.1757e-05 deg
tp 2458252.443232396065
(2018-May-13.94323240)
6.5559e-05 TDB
period 2023.162242740821
5.54
1.4932e-05
4.088e-08
d
yr
n .1779392637894924 1.3133e-09 deg/d
Q 3.755941077845349 1.8481e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1913  
   data-arc span      14864 days (40.70 yr)  
   first obs. used      1978-08-31  
   last obs. used      2019-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5504  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 01:20:47  

Additional Information
 Earth MOID = 1.51634 au 
 Jupiter MOID = 1.61448 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 12.9   n/a MPO299010  
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

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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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