+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17461 Shigosenger (1990 UD1) Classification: Main-belt Asteroid          SPK-ID: 2017461 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2129563942498617 4.8905e-08   a 3.004940973374941 1.6922e-08 au q 2.365019578751344 1.4685e-07 au i 2.789906400147957 4.775e-06 deg node 319.5285660440184 0.00010527 deg peri 41.09745950263482 0.00010579 deg M 309.2782888003759 1.343e-05 deg tp 2459468.567238990696 (2021-Sep-11.06723899) 7.2339e-05 TDB period 1902.621259303367 5.21 1.6072e-05 4.4e-08 d yr n .1892126445238039 1.5983e-09 deg/d Q 3.644862367998538 2.0526e-08 au   Orbit Determination Parameters    # obs. used (total)      989      data-arc span      10887 days (29.81 yr)      first obs. used      1990-10-20      last obs. used      2020-08-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .58383      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:03:51   Additional Information  Earth MOID = 1.36114 au   Jupiter MOID = 1.82357 au   T_jup = 3.215  [ 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 14.26   n/a E2021B10   diameter diameter 6.929 km 0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.064   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17461 Shigosenger           Discovered 1990 Oct. 20 by T. Seki at Geisei. Shigosenger is a team of original characters introduced by Akashi Municipal Planetarium to promote astronomy education for children. The Planetarium is situated on the Japan Standard Time Meridian and "Shigosen" is a Japanese term for the meridian. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2018-05-29 Last Updated: 2018-09-17 [ show close-approach data ] Alternate Designations  1990 UD1 = 2000 PR8  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-15 03:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin