+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 47 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1166241331858674 1.7257e-08   a 3.093002236532775 1.0986e-08 au q 2.732283531755191 5.5564e-08 au i 2.766342866576491 7.472e-07 deg node 211.6418643352063 7.4983e-06 deg peri 163.7882428947197 1.1776e-05 deg M 142.60964513675 1.1451e-05 deg tp 2458213.426706608252 (2018-Apr-04.92670661) 6.1037e-05 TDB period 1986.866914571768 5.44 1.0586e-05 2.898e-08 d yr n .1811897904986712 9.6533e-10 deg/d Q 3.45372094131036 1.2267e-08 au   Orbit Determination Parameters    # obs. used (total)      3625      data-arc span      44406 days (121.58 yr)      first obs. used      1898-11-14      last obs. used      2020-06-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43142      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:32:43   Additional Information  Earth MOID = 1.73356 au   Jupiter MOID = 2.01269 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 10.6   n/a MPO384761   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. 2019-August); 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 ] 2020-Aug-13 06:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin