+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18644 Arashiyama (1998 EX14) Classification: Main-belt Asteroid          SPK-ID: 2018644 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06970807396661903 3.1547e-08   a 2.445193592876723 8.5507e-09 au q 2.27474385704177 7.936e-08 au i 5.706864201386285 3.3475e-06 deg node 186.7276922579055 3.1429e-05 deg peri 48.90661713904559 3.9317e-05 deg M 269.1138317192584 2.5169e-05 deg tp 2459553.084806591758 (2021-Dec-04.58480659) 9.8414e-05 TDB period 1396.587982243379 3.82 7.3257e-06 2.006e-08 d yr n .2577710853717372 1.3521e-09 deg/d Q 2.615643328711676 9.1468e-09 au   Orbit Determination Parameters    # obs. used (total)      2126      data-arc span      10900 days (29.84 yr)      first obs. used      1991-05-12      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48393      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:34:07   Additional Information  Earth MOID = 1.2672 au   Jupiter MOID = 2.36764 au   T_jup = 3.489  [ 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 14.24   n/a E2021B10   diameter diameter 3.803 km 0.099 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.360   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18644 Arashiyama           Discovered 1998 Mar. 2 by T. Seki at Geisei. Arashiyama, situated west of Kyoto city, is the area that includes Arashiyama mountain and the shores of the Katsuragawa river, including the Togetsukyo bridge. It is known nationally for its cherry blossoms and colorful autumn leaves and is designated as a National Historic Site and Place of Scenic Beauty. 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: 2018-05-31 Alternate Designations  1998 EX14 = 1991 JY3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-23 15:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin