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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1999371943934401 3.2687e-08  
a 3.128784634719177 1.4032e-08 au
q 2.50322421299212 1.0108e-07 au
i .7889471629003881 4.2924e-06 deg
node 24.64858550134166 0.00024159 deg
peri 29.79576594795269 0.00024181 deg
M 168.942901982375 1.0646e-05 deg
tp 2458251.864481679238
(2018-May-13.36448168)
5.7354e-05 TDB
period 2021.445012416694
5.53
1.3599e-05
3.723e-08
d
yr
n .178090424319586 1.1981e-09 deg/d
Q 3.754345056446234 1.6838e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2234  
   data-arc span      15542 days (42.55 yr)  
   first obs. used      1978-08-31  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53259  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 23:00:09  

Additional Information
 Earth MOID = 1.514 au 
 Jupiter MOID = 1.61858 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 12.99   n/a E2021B10  
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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