+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74978 (1999 TY234) Classification: Main-belt Asteroid          SPK-ID: 2074978 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1936251337872338 3.2055e-08   a 2.426040686006346 1.2528e-08 au q 1.956298233605095 7.7459e-08 au i 10.78245120557005 4.9108e-06 deg node 47.25891836821077 2.3148e-05 deg peri 246.195728445666 2.8398e-05 deg M 230.0000003359035 1.7999e-05 deg tp 2459498.909598174429 (2021-Oct-11.40959817) 7.0798e-05 TDB period 1380.211198510863 3.78 1.0691e-05 2.927e-08 d yr n .2608296472224042 2.0205e-09 deg/d Q 2.895783138407598 1.4954e-08 au   Orbit Determination Parameters    # obs. used (total)      766      data-arc span      8087 days (22.14 yr)      first obs. used      1998-04-20      last obs. used      2020-06-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55333      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 21:41:37   Additional Information  Earth MOID = .969289 au   Jupiter MOID = 2.34517 au   T_jup = 3.461  [ 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 15.7   n/a MPO319944   diameter diameter 4.015 km 0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.083   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   74978 (1999 TY234)          Discovered 1999-Oct-03 by CSS at Catalina Reference: 20040415/Numbers.arc Last Updated: 2004-04-19 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2111-Feb-11 11:37 00:01 David 0.0104818319178159 0.0104651109426824 0.010498564389891 6.60286864808578 6.60286842980616 2492127.984166587 1.44956681026063 998.32556402528 66.1766436147484 -33.4431064946145 13117.5396433298 T 24 CATAB v2.0f-lin.ifort 2020-Nov-12 21:41:38 2020-Nov-12 21:41 Alternate Designations  1999 TY234 = 1998 HY135  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-20 05:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin