+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07335543642220471 2.1466e-08   a 2.427453731663257 8.0002e-09 au q 2.24938680378239 5.411e-08 au i 6.9865483662188 6.3974e-07 deg node 135.3945885147039 2.883e-06 deg peri 21.26420340146355 1.4698e-05 deg M 292.3974424687865 1.6978e-05 deg tp 2459459.909271311176 (2021-Sep-02.40927131) 6.5585e-05 TDB period 1381.417228614531 3.78 6.8292e-06 1.87e-08 d yr n .2606019329591364 1.2883e-09 deg/d Q 2.605520659544125 8.5871e-09 au   Orbit Determination Parameters    # obs. used (total)      2103      data-arc span      11006 days (30.13 yr)      first obs. used      1991-01-15      last obs. used      2021-03-04      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49476      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:17:49   Additional Information  Earth MOID = 1.26073 au   Jupiter MOID = 2.37741 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 14.02   n/a E2021B10   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. 2020-October); 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 ] 2021-Apr-17 06:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin