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20197 Enriques (1997 CK22)
Classification: Main-belt Asteroid          SPK-ID: 2020197
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1136449146476629 3.1008e-08  
a 2.696471441732655 1.1503e-08 au
q 2.390031174887087 8.297e-08 au
i 13.69835513192207 3.5067e-06 deg
node 148.0838420303861 1.6248e-05 deg
peri 335.7270618070784 2.4323e-05 deg
M 159.4252879681486 1.8034e-05 deg
tp 2458484.279291616080
(2018-Dec-31.77929162)
7.9873e-05 TDB
period 1617.305876027176
4.43
1.0349e-05
2.833e-08
d
yr
n .2225924021770826 1.4243e-09 deg/d
Q 3.002911708578224 1.281e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1655  
   data-arc span      9136 days (25.01 yr)  
   first obs. used      1995-09-03  
   last obs. used      2020-09-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45206  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:14:57  

Additional Information
 Earth MOID = 1.4106 au 
 Jupiter MOID = 2.05106 au 
 T_jup = 3.319 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.13   n/a MPCxxxxx  
diameter diameter 3.338 km 0.205 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 48.073 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.302   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20197 Enriques           Discovered 1997 Feb. 14 by P. G. Comba at Prescott.
Federigo Enriques (1871-1946), professor at the universities of Bologna and Rome, made major contributions to the theory of algebraic surfaces and wrote widely on the history and philosophy of science. He received numerous awards, including an honorary doctorate from the University of St. Andrews.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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