+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17923 (1999 GY16) Classification: Main-belt Asteroid          SPK-ID: 2017923 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0733868298775817 4.089e-08   a 2.426953349351547 9.2886e-09 au q 2.248846936781858 9.8389e-08 au i 6.986531034087148 4.2659e-06 deg node 135.396474751664 2.6919e-05 deg peri 21.42009546670543 3.5487e-05 deg M 240.1108842837729 2.4802e-05 deg tp 2459460.404676513231 (2021-Sep-02.90467651) 9.6264e-05 TDB period 1380.990113703489 3.78 7.9281e-06 2.171e-08 d yr n .2606825323568502 1.4966e-09 deg/d Q 2.605059761921237 9.9703e-09 au   Orbit Determination Parameters    # obs. used (total)      1749      data-arc span      10567 days (28.93 yr)      first obs. used      1991-01-15      last obs. used      2019-12-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51431      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 22:15:12   Additional Information  Earth MOID = 1.26039 au   Jupiter MOID = 2.37863 au   T_jup = 3.496  [ 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 14.0   n/a MPO502305   diameter diameter 3.568 km 0.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 20. h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Polishook, D.; Ofek, E.O.; Waszczak, A.; Kulkarni, S.R.; et al. (2012). Mon. Not. Royal Ast. Soc. 421, 2094-2108.] geometric albedo albedo 0.459   0.118 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17923 (1999 GY16)          Discovered 1999-Apr-15 by LINEAR at Socorro Reference: 20001013/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-03 11:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin