+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   887 Alinda (A918 AA) Classification: Amor [NEO]          SPK-ID: 2000887 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 233 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5703317161596361 4.3623e-08   a 2.473736932165323 6.8343e-09 au q 1.062886302316001 1.0972e-07 au i 9.393854683631437 5.1749e-06 deg node 110.4342525512803 2.7126e-05 deg peri 350.4955476769404 2.8208e-05 deg M 294.5791597141676 1.2047e-05 deg tp 2459258.751179450321 (2021-Feb-13.25117945) 4.8566e-05 TDB period 1421.1132751569 3.89 5.8893e-06 1.612e-08 d yr n .2533225227667046 1.0498e-09 deg/d Q 3.884587562014644 1.0732e-08 au   Orbit Determination Parameters    # obs. used (total)      1285      data-arc span      37411 days (102.43 yr)      first obs. used      1918-02-03      last obs. used      2020-07-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49915      source      ORB      producer      Otto Matic      solution date      2020-Jul-09 06:11:42   Additional Information  Earth MOID = .082217 au   Jupiter MOID = 1.31457 au   T_jup = 3.221  [ 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 13.8   n/a MPO492760   magnitude slope G -0.12   n/a PDS3 (MPC 17260) Fit diameter diameter 4.2 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   rotation period rot_per 73.97 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Dunlap, J.L.; Taylor, R.C. (1979) Astron. J. 84, 269-273.] [Tungalag, N.; Shevchenko, V.G.; Lupishko, D.F. (2002) Kin. Fiz. Neb. Tel 18, 508-516; Kinematics and Physics of Celestial Bodies 18, ???-???.] geometric albedo albedo 0.31   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543   B-V BV 0.832   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=5.86, mean=26.59, max.=49.37) deg. U-B UB 0.436   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=5.86, mean=28.68, max.=49.37) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 887 Alinda (A918 AA)          Discovered 1918-Jan-03 by Wolf, M. at Heidelberg The Feb. 3 observation given by some authorities is a rediscovery. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-11 01:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin