+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21640 Petekirkland (1999 NX39) Classification: Main-belt Asteroid          SPK-ID: 2021640 [ 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 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1791765120529026 3.2905e-08   a 2.277897572176908 5.7175e-09 au q 1.869751830380475 7.417e-08 au i 5.81656781989016 3.9348e-06 deg node 356.2581068287359 2.652e-05 deg peri 51.57681013229561 2.8819e-05 deg M 3.070190147174786 9.067e-06 deg tp 2459189.790665411605 (2020-Dec-06.29066541) 3.1637e-05 TDB period 1255.739959744782 3.44 4.7278e-06 1.294e-08 d yr n .2866835583325443 1.0794e-09 deg/d Q 2.686043313973341 6.7419e-09 au   Orbit Determination Parameters    # obs. used (total)      1927      data-arc span      16090 days (44.05 yr)      first obs. used      1977-02-19      last obs. used      2021-03-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .4392      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:51:02   Additional Information  Earth MOID = .884633 au   Jupiter MOID = 2.72022 au   T_jup = 3.579  [ 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 14.73   n/a E2021B10   diameter diameter 2.586 km 0.618 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.382   0.220 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   21640 Petekirkland           Discovered 1999 July 14 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Peter Jonathan Kirkland (b. 1986) was awarded first place in the 2005 Intel International Science and Engineering Fair for his engineering project. He attends the Dalriada School, Ballymoney, County Antrim, Northern Ireland. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050822/MPCPages.arc Last Updated: 2005-08-26 [ show close-approach data ] Alternate Designations  1999 NX39 = 1977 DH10 = 1998 HT45  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-16 12:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin