+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   175829 (1999 TW98) Classification: Main-belt Asteroid          SPK-ID: 2175829 [ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2693953358001546 4.3057e-08   a 2.361191794203525 9.6507e-09 au q 1.725097737915497 1.0317e-07 au i 5.854254336557662 4.3779e-06 deg node 140.9148657341555 4.0529e-05 deg peri 198.1439985985745 4.1335e-05 deg M 325.1704455523627 7.0333e-06 deg tp 2459328.715562741078 (2021-Apr-24.21556274) 2.6161e-05 TDB period 1325.242407455466 3.63 8.1248e-06 2.224e-08 d yr n .2716484153953529 1.6654e-09 deg/d Q 2.997285850491554 1.225e-08 au   Orbit Determination Parameters    # obs. used (total)      386      data-arc span      10064 days (27.55 yr)      first obs. used      1992-11-19      last obs. used      2020-06-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51222      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 21:06:59   Additional Information  Earth MOID = .715272 au   Jupiter MOID = 2.40339 au   T_jup = 3.494  [ 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 16.92   n/a E2021B55   diameter diameter 1.151 km 0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.254   0.083 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   175829 (1999 TW98)          Discovered 1999-Oct-02 by LINEAR at Socorro Reference: 20080221/Numbers.arc Last Updated: 2008-02-22 Alternate Designations  1999 TW98 = 2006 OS12  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-17 15:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin