+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19902 (3420 T-3) Classification: Main-belt Asteroid          SPK-ID: 2019902 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1355532272692232 2.6872e-08   a 2.445317302450769 7.7141e-09 au q 2.113846650406296 6.6689e-08 au i 2.343233806603618 3.8208e-06 deg node 145.0416888025257 7.9206e-05 deg peri 318.2904207247386 8.0757e-05 deg M 33.70640773033561 1.4919e-05 deg tp 2459069.729065493026 (2020-Aug-08.22906549) 5.7819e-05 TDB period 1396.693969857286 3.82 6.6091e-06 1.809e-08 d yr n .2577515245066782 1.2197e-09 deg/d Q 2.776787954495242 8.7598e-09 au   Orbit Determination Parameters    # obs. used (total)      1454      data-arc span      15865 days (43.44 yr)      first obs. used      1977-10-07      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .5253      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:08:43   Additional Information  Earth MOID = 1.13123 au   Jupiter MOID = 2.34843 au   T_jup = 3.485  [ 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 15.11   n/a E2021B10   diameter diameter 2.451 km 0.358 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 8.32 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.] geometric albedo albedo 0.245   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   19902 (3420 T-3)          Discovered 1977-Oct-16 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar Reference: 20001211/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  3420 T-3 = 1996 TV38 = 2000 SY115  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-19 14:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin