+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .104411393287752 3.0014e-08   a 2.280310136832475 6.6071e-09 au q 2.042219778317611 6.7808e-08 au i 4.312676346838094 3.0596e-06 deg node 128.4383791457622 4.7199e-05 deg peri 339.1392349578462 5.0219e-05 deg M 185.8325797655398 1.8029e-05 deg tp 2459808.990387597105 (2022-Aug-17.49038760) 6.4203e-05 TDB period 1257.735455001108 3.44 5.4664e-06 1.497e-08 d yr n .2862287125393018 1.244e-09 deg/d Q 2.518400495347338 7.297e-09 au   Orbit Determination Parameters    # obs. used (total)      1425      data-arc span      10900 days (29.84 yr)      first obs. used      1990-09-14      last obs. used      2020-07-18      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51849      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:42:35   Additional Information  Earth MOID = 1.05948 au   Jupiter MOID = 2.56867 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-Apr-15 05:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin