+ 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 338 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5703317171014647 4.2584e-08   a 2.473736926874128 5.3036e-09 au q 1.062886297712706 1.0699e-07 au i 9.393850626714981 3.2801e-06 deg node 110.4342436746073 2.4789e-05 deg peri 350.4955516207881 2.5422e-05 deg M 294.5791708528576 7.4333e-06 deg tp 2459258.751134651353 (2021-Feb-13.25113465) 3.0123e-05 TDB period 1421.113270597369 3.89 4.5702e-06 1.251e-08 d yr n .2533225235794702 8.1467e-10 deg/d Q 3.884587556035551 8.3284e-09 au   Orbit Determination Parameters    # obs. used (total)      2027      data-arc span      37604 days (102.95 yr)      first obs. used      1918-02-03      last obs. used      2021-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4289      source      ORB      producer      Otto Matic      solution date      2021-Jan-18 06:07:39   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 28.41 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] 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 ] 2021-Jan-19 03:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin