+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21179 (1994 CL18) Classification: Main-belt Asteroid          SPK-ID: 2021179 [ 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 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07877949840580976 3.3126e-08   a 2.354218402590329 9.0225e-09 au q 2.168754257696536 7.8839e-08 au i 7.085021093874715 3.4422e-06 deg node 119.115763686354 2.8238e-05 deg peri 281.4093010543862 3.6081e-05 deg M 266.1543021959782 2.4352e-05 deg tp 2459544.438204173510 (2021-Nov-25.93820417) 9.0212e-05 TDB period 1319.375915995986 3.61 7.5847e-06 2.077e-08 d yr n .2728562766952123 1.5686e-09 deg/d Q 2.539682547484122 9.7333e-09 au   Orbit Determination Parameters    # obs. used (total)      1394      data-arc span      9686 days (26.52 yr)      first obs. used      1994-02-08      last obs. used      2020-08-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52046      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:58:28   Additional Information  Earth MOID = 1.18924 au   Jupiter MOID = 2.73544 au   T_jup = 3.541  [ 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 15.39   n/a E2021B10   diameter diameter 5.372 km 0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.038   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21179 (1994 CL18)          Discovered 1994-Feb-08 by Elst, E. W. at La Silla Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1994 CL18 = 1994 EX5 = 1998 HH110  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-13 05:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin