+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   140P/Bowell-Skiff Classification: Jupiter-family Comet          SPK-ID: 1000006 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2451320.5 (1999-May-22.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.691761661370916 5.9685e-07   a 6.39724825593164 4.0534e-07 au q 1.97187717420617 3.7662e-06 au i 3.83582756854885 4.0404e-05 deg node 343.4564572071254 0.00049698 deg peri 173.0867710151257 0.00059916 deg M .437851279495995 3.2412e-05 deg tp 2451313.311929034546 (1999-May-14.81192903) 0.00053143 TDB period 5910.010244898941 16.18 0.0005617 1.538e-06 d yr n .06091359999091776 5.7893e-09 deg/d Q 10.8226193376571 6.8573e-07 au   Orbit Determination Parameters    planetary ephem.      DE405      source      ORB   Additional Information  Earth MOID = .981441 au   T_jup = 2.411  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 11.5   n/a MPC 33595   comet total magnitude slope K1 15   n/a MPC 33595   comet nuclear magnitude M2 16.3   n/a MPC 33595   comet nuclear magnitude slope K2 5   n/a MPC 33595   comet nuclear phase coefficient PC 0.03   n/a MPC 33595   [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1999.4   140P/1998 X2         1983.2   140P/1983 C1   1983 II   1983c  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-05 10:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin