+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1471 Tornio (1938 SL1) Classification: Main-belt Asteroid          SPK-ID: 2001471 [ 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 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1186940698814224 3.3199e-08   a 2.716955964029264 9.9442e-09 au q 2.394469402970027 9.0571e-08 au i 13.6063806048931 4.442e-06 deg node 321.9366128213434 1.5503e-05 deg peri 94.02622747644939 2.5939e-05 deg M 48.02642585523723 1.8961e-05 deg tp 2458782.277215594545 (2019-Oct-25.77721559) 8.6274e-05 TDB period 1635.77032825142 4.48 8.9805e-06 2.459e-08 d yr n .220079795911708 1.2083e-09 deg/d Q 3.0394425250885 1.1125e-08 au   Orbit Determination Parameters    # obs. used (total)      2653      data-arc span      32761 days (89.69 yr)      first obs. used      1931-02-18      last obs. used      2020-10-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40102      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:18:39   Additional Information  Earth MOID = 1.45265 au   Jupiter MOID = 2.30934 au   T_jup = 3.310  [ 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 11.1   n/a MPO502167   diameter diameter 28.719 km 0.399 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 6.60 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Stephens, R.D. (2002) Minor Planet Bull. 29, 34.] geometric albedo albedo 0.085   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   SMASSII spectral type spec_B T   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) 1471 Tornio (1938 SL1)          Discovered 1938-Sep-16 by Vaisala, Y. at Turku Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1938 SL1 = 1931 BA = 1949 EK  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Nov-18 20:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin