+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   391 Ingeborg (A894 VB) Classification: Mars-crossing Asteroid          SPK-ID: 2000391 [ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3056858772403707 4.1056e-08   a 2.319649561007873 4.5982e-09 au q 1.610565450060941 9.5541e-08 au i 23.20358812174161 4.7192e-06 deg node 212.8644870599659 8.8635e-06 deg peri 147.0248032318729 1.025e-05 deg M 211.0955400119073 7.5543e-06 deg tp 2459534.249155430059 (2021-Nov-15.74915543) 2.8205e-05 TDB period 1290.422704398422 3.53 3.837e-06 1.051e-08 d yr n .2789783524212148 8.2952e-10 deg/d Q 3.028733671954806 6.0038e-09 au   Orbit Determination Parameters    # obs. used (total)      2571      data-arc span      45913 days (125.70 yr)      first obs. used      1894-11-19      last obs. used      2020-08-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39252      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:15:20   Additional Information  Earth MOID = .644286 au   Jupiter MOID = 2.54554 au   T_jup = 3.412  [ 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 10.8   n/a MPO263346   diameter diameter 15.751 km 3.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   rotation period rot_per 26.391 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Koff, R.A.; Brincat, S.M.; Stephens, R.D.; Pravec, P. (2001) Minor Planet Bull. 28, 46-48.] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.290   0.110 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a medium resolution spectrum published by Chapman and Gaffey (1979) SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 391 Ingeborg (A894 VB)          Discovered 1894-Nov-01 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A894 VB = 1934 AJ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-26 07:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin