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7220 Philnicholson (1981 QE)
Classification: Main-belt Asteroid          SPK-ID: 2007220
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2157804259399256 3.298e-08  
a 2.41797446655286 7.6145e-09 au
q 1.89622290624822 7.8885e-08 au
i 1.08755408238203 3.8203e-06 deg
node 206.638506704573 0.00015911 deg
peri 165.1262387741733 0.00015927 deg
M 96.28098897856783 7.6356e-06 deg
tp 2458633.205830427938
(2019-May-29.70583043)
2.8383e-05 TDB
period 1373.333432162562
3.76
6.4872e-06
1.776e-08
d
yr
n .2621359034660031 1.2383e-09 deg/d
Q 2.939726026857501 9.2576e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1973  
   data-arc span      23429 days (64.15 yr)  
   first obs. used      1955-12-11  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49148  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:24:09  

Additional Information
 Earth MOID = .896359 au 
 Jupiter MOID = 2.52569 au 
 T_jup = 3.483 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.1   n/a MPO448985  
diameter diameter 3.541 km 0.696 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.340   0.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7220 Philnicholson           Discovered 1981 Aug. 30 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Named in honor Philip D. Nicholson (b. 1951), professor of astronomy at Cornell University, an Australian by birth. Nicholson's research centers on the orbital dynamics of planetary ring systems and natural satellites, and infrared observational studies of planets, their satellites and rings. He has also investigated the dynamics of a planetary system around the pulsar PSR 1257+12 and has studied the zodiacal dust bands. Nicholson is codiscoverer of two irregular satellites of Uranus and is currently editor of the journal Icarus, which is devoted to planetary science.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19981005/MPCPages.arcLast Updated: 2009-11-17

Alternate Designations
 1981 QE = 1992 OA8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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