+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18610 Arthurdent (1998 CC2) Classification: Main-belt Asteroid          SPK-ID: 2018610 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2137881674132492 5.0128e-08   a 2.5478863640219 9.7574e-09 au q 2.003178407480451 1.3012e-07 au i 5.602013964710111 4.8961e-06 deg node 319.3035325720111 4.112e-05 deg peri 140.4543169518915 4.1955e-05 deg M 251.4310868355829 1.0677e-05 deg tp 2459648.493278626415 (2022-Mar-09.99327863) 4.5751e-05 TDB period 1485.485813616555 4.07 8.5333e-06 2.336e-08 d yr n .242344959945155 1.3921e-09 deg/d Q 3.092594320563349 1.1843e-08 au   Orbit Determination Parameters    # obs. used (total)      1580      data-arc span      11753 days (32.18 yr)      first obs. used      1988-10-08      last obs. used      2020-12-12      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50991      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:33:17   Additional Information  Earth MOID = 1.0235 au   Jupiter MOID = 2.07865 au   T_jup = 3.403  [ 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 14.4   n/a MPO474012   diameter diameter 3.463 km 0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.234   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18610 Arthurdent           Discovered 1998 Feb. 7 at Starkenburg Observatory. The earthling Arthur Dent is confronted with the adversities of life, the universe and everything in a highly amusing and entertaining way in Douglas Adam's famous five-volume trilogy The Hitch Hiker's Guide to the Galaxy. 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.arc Last Updated: 2009-05-11 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2143-Aug-07 10:08 < 00:01 Thisb 0.0366588764299627 0.0366576294588984 0.0366601235498044 6.66481165882898 6.66481163092233 2503992.922456151 0.574211372840894 865.983945812911 61.6053327658295 -89.4450513282404 88996.073375392 T 27 CATAB v2.0f-lin.ifort 2021-Apr-13 02:33:21 2021-Apr-13 02:33 Alternate Designations  1998 CC2 = 1990 EG3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-15 05:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin