+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1542 Schalen (1941 QE) Classification: Main-belt Asteroid          SPK-ID: 2001542 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 50 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1168831889241253 1.7254e-08   a 3.092274816010315 1.095e-08 au q 2.730839874485266 5.5548e-08 au i 2.766798822596824 7.4731e-07 deg node 211.6355397184894 7.4961e-06 deg peri 163.7682977402947 1.1757e-05 deg M 178.8769853228681 1.1529e-05 deg tp 2458213.612795203757 (2018-Apr-05.11279520) 6.0877e-05 TDB period 1986.16604078707 5.44 1.0549e-05 2.888e-08 d yr n .1812537283425411 9.6271e-10 deg/d Q 3.453709757535364 1.2229e-08 au   Orbit Determination Parameters    # obs. used (total)      3744      data-arc span      44625 days (122.18 yr)      first obs. used      1898-11-14      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42665      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:56:16   Additional Information  Earth MOID = 1.73069 au   Jupiter MOID = 2.01391 au   T_jup = 3.212  [ 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 10.63   n/a E2021B10   diameter diameter 42.374 km 0.273 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 7.516 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Li, B.; Zhao, H.; Han, X.L.; Klinglesmith III, D.A.; Hanowell, J. (2013) Minor Planet Bull. 40, 68-69.] [Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.] geometric albedo albedo 0.068   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B D   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) 1542 Schalen (1941 QE)          Discovered 1941-Aug-26 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1941 QE = 1927 BH = 1936 UL = 1940 LP = 1976 CA = A898 VD = A924 NA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-03 00:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin