+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1403 Idelsonia (1936 QA) Classification: Main-belt Asteroid          SPK-ID: 2001403 [ 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 42 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2950100068688888 3.492e-08   a 2.715381326398842 8.0314e-09 au q 1.914316662646268 9.4371e-08 au i 10.18266639888405 3.8205e-06 deg node 156.9792242088682 1.9596e-05 deg peri 192.406239631163 2.029e-05 deg M 280.3424269176757 7.4447e-06 deg tp 2459562.133985222116 (2021-Dec-13.63398522) 3.469e-05 TDB period 1634.348494968775 4.47 7.2509e-06 1.985e-08 d yr n .2202712586135908 9.7725e-10 deg/d Q 3.516445990151417 1.0401e-08 au   Orbit Determination Parameters    # obs. used (total)      2914      data-arc span      30891 days (84.57 yr)      first obs. used      1936-08-17      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41244      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:24:07   Additional Information  Earth MOID = .907299 au   Jupiter MOID = 1.91823 au   T_jup = 3.275  [ 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 11.68   n/a E2021B10   diameter diameter 26.531 km 0.172 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.458 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Almeida, R.; Angeli, C.A.; Duffard, R.; Lazzaro, D. (2004) Astron. Astrophys. 415, 403-406.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.] geometric albedo albedo 0.072   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B Cgh   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) 1403 Idelsonia (1936 QA)          Discovered 1936-Aug-13 by Neujmin, G. at Simeis Provisional designation is associated with an independent discovery Aug. l7 by K. Reinmuth, Heidelberg, which was announced first. 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-Apr-23 00:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin