+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   42355 Typhon (2002 CR46) Classification: TransNeptunian Object          SPK-ID: 2042355 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5360599851589742 5.2885e-06   a 37.87667984200506 0.00047546 au q 17.57250740802861 2.0835e-05 au i 2.432573290963026 1.5552e-05 deg node 352.0665863429984 0.00018331 deg peri 159.1880746919683 0.00026154 deg M 21.65832531457544 0.00045502 deg tp 2453878.039085739325 (2006-May-22.53908574) 0.012083 TDB period 85144.43764000651 233.11 1.6032 0.004389 d yr n .004228109433549751 7.9612e-08 deg/d Q 58.18085227598151 0.00073034 au   Orbit Determination Parameters    # obs. used (total)      302      data-arc span      11079 days (30.33 yr)      first obs. used      1989-12-28      last obs. used      2020-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      1      norm. resid. RMS      .44896      source      ORB      producer      Otto Matic      solution date      2020-May-20 09:05:30   Additional Information  Earth MOID = 16.5837 au   Jupiter MOID = 12.1745 au   T_jup = 4.688  [ 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 7.6   n/a MPO385085   diameter diameter 192.000 km 50.000 urn:nasa:pds:neowise_diameters_albedos::2.0[centaurs] (http://adsabs.harvard.edu/abs/2013ApJ...773...22B)   rotation period rot_per 5. h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Dotto, E.; Pema, D.; Barucci, M.A.; Rossi, A. et al. (2008) Astron. Astrophys. 490, 829-833.] [Perna, D.; Dotto, E.; Barucci, M.A.; Rossi, A.; et al. (2008) Bull. Amer. Astron. Soc. 40, #47.08.] geometric albedo albedo 0.050   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[centaurs] (http://adsabs.harvard.edu/abs/2013ApJ...773...22B)   42355 Typhon           Discovered 2002 Feb. 5 by NEAT at Palomar. The secondary object (42355) Typhon I, discovered 2006 Jan. 20 by K. Noll, W. Grundy, D. Stephens and H. Levison using the Hubble Space Telescope, is named Echidna for the mother of all the major monsters in classical Greek mythology. Half nymph and half snake, Echidna lives, immortal, in a deep cave called Arima. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20061109/MPCPages.arc Last Updated: 2006-11-13 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2020-Oct-26 05:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin