+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   90482 Orcus (2004 DW) Classification: TransNeptunian Object          SPK-ID: 2090482 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2214766902827574 2.1723e-05   a 39.36769850406284 0.001288 AU q 30.64867093533354 0.0018542 AU i 20.543733671746 5.5079e-05 deg node 268.4230539718261 0.00026977 deg peri 73.73995834618785 0.0046736 deg M 169.6872845509115 0.006737 deg tp 2413874.428506525917 (1896-Nov-10.92850653) 0.50059 JED period 90221.1723062689 247.01 4.4276 0.01212 d yr n .003990194217139273 1.9582e-07 deg/d Q 48.08672607279213 0.0015732 AU   Orbit Determination Parameters    # obs. used (total)      425      data-arc span      21915 days (60.00 yr)      first obs. used      1951-11-08      last obs. used      2011-11-08      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      1      fit RMS      .2724      data source      ORB      producer      Otto Matic      solution date      2012-Feb-09 13:16:59   Additional Information  Earth MOID = 29.7008 AU   T_jup = 5.156  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 2.3 mag n/a MPO64575   rotation period rot_per 13.188 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Rabinowitz, D.L.; Schaefer, B.E.; Tourtellotte, S.W. (2007) Astron. J. 133, 26-43.] 90482 Orcus I           Discovered 2005 Nov. 13 by T.-A. Suer and M. E. Brown at Palomar. Vanth is a daimon in Etruscan mythology who guides the dead to the underworld. She often appears on tomb paintings and sarcophagi, where she is depicted with wings and a torch. She is frequently shown in the presence of Charun, a guard of the underworld. The name was suggested by S. Taaffe. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20100330/MPCPages.arc Last Updated: 2010-04-05 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-23 21:11 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin