+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   11980 Ellis (1995 SP8) Classification: Main-belt Asteroid          SPK-ID: 2011980 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1070290799282853 3.0707e-08   a 2.46188633191033 9.0702e-09 au q 2.198392902917946 7.7148e-08 au i 6.433343981587786 3.8995e-06 deg node 172.6193193856585 3.0785e-05 deg peri 91.58967324484152 3.5943e-05 deg M 269.5551109851891 1.8607e-05 deg tp 2459554.972013403254 (2021-Dec-06.47201340) 7.3343e-05 TDB period 1410.913609549284 3.86 7.7972e-06 2.135e-08 d yr n .2551538220082815 1.4101e-09 deg/d Q 2.725379760902713 1.0041e-08 au   Orbit Determination Parameters    # obs. used (total)      1332      data-arc span      9851 days (26.97 yr)      first obs. used      1994-04-03      last obs. used      2021-03-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53892      source      ORB      producer      Otto Matic      solution date      2021-May-04 01:05:12   Additional Information  Earth MOID = 1.19271 au   Jupiter MOID = 2.34553 au   T_jup = 3.473  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.88   n/a MPCxxxxx   11980 Ellis           Discovered 1995 Sept. 17 by Spacewatch at Kitt Peak. Kerry Ellis (b. 1965) wrote a thesis at the University of Western Ontario in electrical engineering and specialized in meteor burst communication. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20020427/MPCPages.arc Last Updated: 2003-10-02 Alternate Designations  1995 SP8 = 1998 HW90  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-May-16 03:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin