+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   16807 Terasako (1997 TW25) Classification: Main-belt Asteroid          SPK-ID: 2016807 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1041986520602051 2.9383e-08   a 2.280088970488766 6.6879e-09 au q 2.042506773186496 6.6344e-08 au i 4.313055879453032 3.0481e-06 deg node 128.4380208974033 4.6547e-05 deg peri 339.4231597876818 4.9609e-05 deg M 241.5867333175069 1.8187e-05 deg tp 2459810.141380589308 (2022-Aug-18.64138059) 6.4344e-05 TDB period 1257.552478570096 3.44 5.5329e-06 1.515e-08 d yr n .2862703593963243 1.2595e-09 deg/d Q 2.517671167791037 7.3848e-09 au   Orbit Determination Parameters    # obs. used (total)      1436      data-arc span      11234 days (30.76 yr)      first obs. used      1990-09-14      last obs. used      2021-06-17      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51805      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 04:13:25   Additional Information  Earth MOID = 1.06019 au   Jupiter MOID = 2.56816 au   T_jup = 3.595  [ 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 15.29   n/a E2021B10   16807 Terasako           Discovered 1997 Oct. 12 by A. Nakamura at Kuma Kogen. Masanori Terasako (b. 1951) is a renowned amateur astronomer in Japan. Terasako started his visual comet searching in 1971, and after sweeping for 1374 hours he discovered C/1987 B2. He is also famous for his telescopic meteor observations. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010804/MPCPages.arc Last Updated: 2009-05-11 Alternate Designations  1997 TW25 = 1990 RZ12  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Aug-03 02:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin