+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1705 Tapio (1941 SL1) Classification: Main-belt Asteroid          SPK-ID: 2001705 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2456553080233355 1.3317e-08   a 2.299336354734033 5.4267e-09 au q 1.734492174262591 3.044e-08 au i 7.71038774688617 5.6727e-07 deg node 188.5905811323145 5.2159e-06 deg peri 156.4157710213387 5.8248e-06 deg M 330.3640479676771 3.2104e-06 deg tp 2459501.337961610014 (2021-Oct-13.83796161) 1.1671e-05 TDB period 1273.509490717278 3.49 4.5084e-06 1.234e-08 d yr n .2826834056786161 1.0007e-09 deg/d Q 2.864180535205475 6.7597e-09 au   Orbit Determination Parameters    # obs. used (total)      2743      data-arc span      29127 days (79.75 yr)      first obs. used      1941-09-26      last obs. used      2021-06-25      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44679      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:41:50   Additional Information  Earth MOID = .730137 au   Jupiter MOID = 2.57837 au   T_jup = 3.540  [ 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 13.37   n/a E2021B10   diameter diameter 11.969 km 0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 54.8 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2014) http://www.asu.cas.cz/~ppravec/neo.htm] geometric albedo albedo 0.089   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   SMASSII spectral type spec_B B   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) 1705 Tapio           Discovered 1941 Sept. 29 by L. Oterma at Turku. Named for the guardian spirit of the forest in Kalevala, the Finnish national epic. Tapio is also a common boy's name in Finland. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 5281 Last Updated: 2007-10-23 Alternate Designations  1941 SL1 = 1948 TJ1 = 1948 TV1 = 1955 VN = 1982 FM3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-24 00:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin