+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   134691 (1999 XR61) Classification: Main-belt Asteroid          SPK-ID: 2134691 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1818197810097202 3.5693e-08   a 2.43713914448065 1.3171e-08 au q 1.994019038940962 8.5746e-08 au i 2.098648026062363 4.6152e-06 deg node 182.9794115097544 0.00011684 deg peri 145.9381341592389 0.00011781 deg M 220.5319307004724 1.8158e-05 deg tp 2459538.882832243758 (2021-Nov-20.38283224) 7.2877e-05 TDB period 1389.693143249164 3.80 1.1265e-05 3.084e-08 d yr n .2590499936973886 2.0999e-09 deg/d Q 2.880259250020339 1.5565e-08 au   Orbit Determination Parameters    # obs. used (total)      722      data-arc span      9500 days (26.01 yr)      first obs. used      1994-04-15      last obs. used      2020-04-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55864      source      ORB      producer      Otto Matic      solution date      2020-May-20 22:22:19   Additional Information  Earth MOID = .983305 au   Jupiter MOID = 2.46765 au   T_jup = 3.480  [ 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 15.8   n/a MPO268072   diameter diameter 1.492 km 0.195 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.416   0.124 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   134691 (1999 XR61)          Discovered 1999-Dec-07 by LINEAR at Socorro Reference: 20060907/Numbers.arc Last Updated: 2006-09-10 [ show close-approach data ] Alternate Designations  1999 XR61 = 2003 YF98  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-28 02:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin