+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19509 Niigata (1998 MG38) Classification: Main-belt Asteroid          SPK-ID: 2019509 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2143907703633112 6.6447e-08   a 2.603948033498812 1.199e-08 au q 2.045685608610972 1.7001e-07 au i 12.65341738591454 5.1089e-06 deg node 246.0959985698101 1.9922e-05 deg peri 333.0450688211727 2.1759e-05 deg M 190.0792038512189 8.0291e-06 deg tp 2460120.920830173106 (2023-Jun-25.42083017) 3.55e-05 TDB period 1534.782703312969 4.20 1.06e-05 2.902e-08 d yr n .2345608920552122 1.62e-09 deg/d Q 3.162210458386651 1.456e-08 au   Orbit Determination Parameters    # obs. used (total)      1891      data-arc span      11641 days (31.87 yr)      first obs. used      1989-02-05      last obs. used      2020-12-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40176      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:56:04   Additional Information  Earth MOID = 1.04519 au   Jupiter MOID = 1.87089 au   T_jup = 3.347  [ 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 14.51   n/a E2021B10   diameter diameter 7.520 km 0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.058   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   19509 Niigata           Discovered 1998 June 29 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station. Niigata prefecture is located on the island of Honshu, Japan. The Asteroids, Comets, Meteors 2012 meeting is to be held at Toki Messe in Niigata city, capital of the prefecture. Niigata is known for high quality rice and sake. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20120506/MPCPages.arc Last Updated: 2012-05-09 [ show close-approach data ] Alternate Designations  1998 MG38 = 1989 CW3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jul-25 13:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin