+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1819570153705057 3.5669e-08   a 2.436816005207268 1.311e-08 au q 1.993420237892675 8.5673e-08 au i 2.098861254046698 4.6078e-06 deg node 182.9800150997244 0.00011653 deg peri 145.9680363937831 0.0001175 deg M 272.3233965155637 1.8403e-05 deg tp 2459538.887063069563 (2021-Nov-20.38706307) 7.2788e-05 TDB period 1389.416764150392 3.80 1.1212e-05 3.07e-08 d yr n .2591015232352797 2.0909e-09 deg/d Q 2.880211772521861 1.5495e-08 au   Orbit Determination Parameters    # obs. used (total)      730      data-arc span      9533 days (26.10 yr)      first obs. used      1994-04-15      last obs. used      2020-05-21      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55937      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 18:09:29   Additional Information  Earth MOID = .98078 au   Jupiter MOID = 2.46783 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 15.88   n/a E2021B55   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 ] 2021-Apr-16 10:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin