+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74862 (1999 TB91) Classification: Main-belt Asteroid          SPK-ID: 2074862 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1926061918910801 3.7408e-08   a 2.240163894671652 7.3385e-09 au q 1.808694457707054 8.553e-08 au i 3.108677362833574 3.739e-06 deg node 90.96974996552747 7.6592e-05 deg peri 251.122689240614 7.7317e-05 deg M 75.6393622894883 9.5277e-06 deg tp 2458743.185965220707 (2019-Sep-16.68596522) 3.2526e-05 TDB period 1224.667285877141 3.35 6.0178e-06 1.648e-08 d yr n .2939573908371022 1.4445e-09 deg/d Q 2.671633331636249 8.7519e-09 au   Orbit Determination Parameters    # obs. used (total)      867      data-arc span      11018 days (30.17 yr)      first obs. used      1989-09-29      last obs. used      2019-11-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .58441      source      ORB      producer      Otto Matic      solution date      2019-Dec-14 07:27:22   Additional Information  Earth MOID = .803407 au   Jupiter MOID = 2.72591 au   T_jup = 3.609  [ 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 16.1   n/a MPO233864   rotation period rot_per 1.15 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Incomplete or inconclusive result. Published Reference List: [Erasmus, N.; McNeill, A.; Mommert, M.; Trilling, D.E.; et al. (2018) Ap. J. Suppl. Series 237, A19.] [Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.] 74862 (1999 TB91)          Discovered 1999-Oct-02 by LINEAR at Socorro Reference: 20040415/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 TB91 = 1989 TM5  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-03 15:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin