Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1145097224740803 3.7793e-08  
a 2.693797986970424 1.3755e-08 au
q 2.385331927081204 1.0502e-07 au
i 13.69428739836535 5.0189e-06 deg
node 148.1181640648969 1.8198e-05 deg
peri 335.2409212460441 3.2214e-05 deg
M 26.16157739466547 2.4166e-05 deg
tp 2458483.143435330673
(2018-Dec-30.64343533)
0.00010854 TDB
period 1614.90122111568
4.42
1.2369e-05
3.386e-08
d
yr
n .2229238514980429 1.7075e-09 deg/d
Q 3.002264046859643 1.533e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1380  
   data-arc span      8648 days (23.68 yr)  
   first obs. used      1995-09-03  
   last obs. used      2019-05-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46061  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:50:24  

Additional Information
 Earth MOID = 1.40666 au 
 Jupiter MOID = 2.05552 au 
 T_jup = 3.321 
[ 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 14.1   n/a MPO474031  
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. 2019-January); 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-20 23:39 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin