+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15461 Johnbird (1998 YT29) Classification: Main-belt Asteroid          SPK-ID: 2015461 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1241923891650888 4.0867e-08   a 3.190028687261035 1.87e-08 au q 2.793851403084915 1.3404e-07 au i 13.41812838792089 4.4075e-06 deg node 18.535146540387 1.5517e-05 deg peri 39.96031051104196 2.7472e-05 deg M 2.07791594734057 1.8697e-05 deg tp 2459188.487987231898 (2020-Dec-04.98798723) 0.00010812 TDB period 2081.087351993844 5.70 1.8299e-05 5.01e-08 d yr n .1729864917275538 1.5211e-09 deg/d Q 3.586205971437155 2.1022e-08 au   Orbit Determination Parameters    # obs. used (total)      1484      data-arc span      10736 days (29.39 yr)      first obs. used      1991-10-05      last obs. used      2021-02-25      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50718      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:59:25   Additional Information  Earth MOID = 1.81821 au   Jupiter MOID = 1.92622 au   T_jup = 3.143  [ 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 13.67   n/a E2021B10   diameter diameter 6.663 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.190   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15461 Johnbird           Discovered 1998 Dec. 27 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station. John M. Bird (b. 1931) is a professor of geology at Cornell University. He is a pioneer in the geological interpretation of plate-tectonic motions and of deep-earth mineralogy. The name was suggested by P. C. Thomas. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20040928/MPCPages.arc Last Updated: 2004-09-28 [ show close-approach data ] Alternate Designations  1998 YT29 = 2000 GV42  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-16 03:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin