+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   13P/Olbers Classification: Halley-type Comet* [NEO]          SPK-ID: 1000066 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] alternate orbits: [epoch=1956-Oct-14.0] 10 (default) [epoch=1887-Oct-16.0] SAO/1887 [epoch=1815-Apr-17.0] SAO/1815 Orbital Elements at Epoch 2435760.5 (1956-Oct-14.0) TDB Reference: JPL 10 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.930297147462082 3.3699e-07   a 16.9067774347548 0.00011337 au q 1.17845061442612 3.1063e-06 au i 44.609885733805 0.00011665 deg node 86.10312835462277 0.00012038 deg peri 64.64120651677283 0.00070188 deg M 1.656899068407468 2.4669e-05 deg tp 2435643.635331048669 (1956-Jun-19.13533105) 0.00061193 TDB period 25391.57732940006 69.52 0.2554 0.0006992 d yr n .01417792976504724 1.4261e-07 deg/d Q 32.63510425508353 0.00021884 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 9.451067991051224E-9 2.086E-9 A2 [EST] 6.487207540562958E-10 2.294E-12   Orbit Determination Parameters    # obs. used (total)      91      data-arc span      51679 days (141.49 yr)      first obs. used      1815-03-17      last obs. used      1956-09-12      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      norm. resid. RMS      1.1672      source      ORB      producer      M.S.W. Keesey      solution date      2001-Nov-28 15:48:32   Additional Information  Earth MOID = .477199 au   T_jup = 1.249  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 5.   n/a MPC data tape   comet total magnitude slope K1 15.0   n/a MPC data tape   comet nuclear magnitude M2 11.5   n/a MPC data tape   comet nuclear magnitude slope K2 10.0   n/a MPC data tape   13P/Olbers          Discovered 1815-Mar-06 by Olbers, Heinrich Wilhelm at Bremen, Germany Reference: comet.dis Last Updated: 2003-08-29 Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1956.5   13P/1956 A1   1956 IV   1956a   1886.9   13P/1887 Q1   1887 V   1887f   1817.4   13P/1815 E1   1815     [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-07 09:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin