+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2634 James Bradley (1982 DL) Classification: Outer Main-belt Asteroid          SPK-ID: 2002634 [ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04880082027892545 3.2673e-08   a 3.460142313948766 2.0595e-08 au q 3.291284530746247 1.1607e-07 au i 6.421122313550857 3.6818e-06 deg node 133.3466694087495 3.4772e-05 deg peri 333.4669576509433 5.3197e-05 deg M 15.03209841413554 4.053e-05 deg tp 2458902.335043443968 (2020-Feb-22.83504344) 0.0002645 TDB period 2350.928219505253 6.44 2.099e-05 5.747e-08 d yr n .153131004601987 1.3672e-09 deg/d Q 3.629000097151285 2.16e-08 au   Orbit Determination Parameters    # obs. used (total)      2817      data-arc span      42074 days (115.19 yr)      first obs. used      1905-02-09      last obs. used      2020-04-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44346      source      ORB      producer      Otto Matic      solution date      2020-May-20 01:42:48   Additional Information  Earth MOID = 2.3096 au   Jupiter MOID = 1.43782 au   T_jup = 3.123  [ 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 10.5   n/a MPO256882   diameter diameter 33.726 km 0.488 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 16.514 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.] geometric albedo albedo 0.107   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   2634 James Bradley (1982 DL)          Discovered 1982-Feb-21 by Bowell, E. at Flagstaff (AM) Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1982 DL = 1931 FL = 1961 XH = 1963 FC = 1975 AO = 1976 GB1 = 1977 KP = A905 CC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-10 19:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin