+ 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 | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1070290865676636 3.3813e-08   a 2.461886329379719 9.7686e-09 au q 2.198392884312789 8.3373e-08 au i 6.433343099137496 3.9425e-06 deg node 172.6193406188401 3.3477e-05 deg peri 91.58965273194866 3.8454e-05 deg M 269.5551103490011 1.9428e-05 deg tp 2459554.972015350053 (2021-Dec-06.47201535) 7.6768e-05 TDB period 1410.913607373834 3.86 8.3976e-06 2.299e-08 d yr n .2551538224016964 1.5187e-09 deg/d Q 2.725379774446649 1.0814e-08 au   Orbit Determination Parameters    # obs. used (total)      1238      data-arc span      9787 days (26.80 yr)      first obs. used      1994-04-03      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55297      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:10:13   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 | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.89   n/a E2021B10   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 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2015-Mar-29 13:48 < 00:01 Psych 0.0107920489417687 0.0107899045463412 0.010794193571727 2.95870561182954 2.95870523290955 2457111.075343112 0.89379173075223 138.256579884852 46.1308620530511 42.3706659845991 25070.5149538695 T 29 CATAB v2.0f-lin.ifort 2021-Feb-24 19:10:17 2021-Feb-24 19:10 2165-Feb-14 04:57 00:03 Hebe 0.02703039133699 0.0270061124731866 0.0270547043114619 6.07031955130912 6.07031951342182 2511854.706000154 3.27050177187704 1939.43963084078 44.4605407858946 51.3734333114207 71043.4953904481 T 29 CATAB v2.0f-lin.ifort 2021-Feb-24 19:10:17 2021-Feb-24 19:10 2167-May-07 03:59 00:01 Eunom 0.0260144052997709 0.0259835956129646 0.02604521686064 6.85350826421138 6.85350818547653 2512666.666047323 1.05204173546607 1574.79841234812 44.5888360271232 12.7758220981082 19441.0063371721 T 29 CATAB v2.0f-lin.ifort 2021-Feb-24 19:10:17 2021-Feb-24 19:10 Alternate Designations  1995 SP8 = 1998 HW90  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-28 22:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin