+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   137805 (1999 YK5) Classification: Aten [NEO]          SPK-ID: 2137805 [ 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 243 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .558315681031332 5.7896e-08   a .829370538512895 1.2221e-09 au q .3663199614757455 4.821e-08 au i 16.74676039803997 5.8038e-06 deg node 349.5508895904397 2.748e-05 deg peri 292.8536225841218 2.3972e-05 deg M 63.73272456282895 1.5115e-05 deg tp 2459151.659363291074 (2020-Oct-29.15936329) 1.1529e-05 TDB period 275.8807086284231 0.76 6.0978e-07 1.669e-09 d yr n 1.304911828702293 2.8842e-09 deg/d Q 1.292421115550045 1.9044e-09 au   Orbit Determination Parameters    # obs. used (total)      1254      data-arc span      7726 days (21.15 yr)      first obs. used      1999-12-28      last obs. used      2021-02-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44498      source      ORB      producer      Otto Matic      solution date      2021-Mar-04 05:55:54   Additional Information  Earth MOID = .114266 au   Jupiter MOID = 3.93578 au   T_jup = 6.908  [ 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 16.7   n/a MPO502859   diameter diameter 2.243 km 0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   rotation period rot_per 3.930 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Warner, B.D. (2016) Minor Planet Bull. 43, 240-250.] geometric albedo albedo 0.027   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)   SMASSII spectral type spec_B X   n/a Binzel et al. (2001) Icarus 151, 139-149   137805 (1999 YK5)          Discovered 1999-Dec-28 by LINEAR at Socorro Reference: 20061205/Numbers.arc Last Updated: 2006-12-13 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-04 20:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin