+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4957 Brucemurray (1990 XJ) Classification: Amor [NEO]          SPK-ID: 2004957 [ 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 108 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .218791417637999 2.3896e-07   a 1.565492768282205 1.7411e-08 au q 1.222976386207706 3.846e-07 au i 35.01082596088146 1.1634e-05 deg node 254.9001691395878 1.8083e-05 deg peri 97.46013175965335 7.4149e-05 deg M 65.36832363710067 0.00012656 deg tp 2458870.590810743648 (2020-Jan-22.09081074) 0.0002495 TDB period 715.442978038117 1.96 1.1936e-05 3.268e-08 d yr n .5031847555303284 8.3946e-09 deg/d Q 1.908009150356704 2.1221e-08 au   Orbit Determination Parameters    # obs. used (total)      539      data-arc span      16381 days (44.85 yr)      first obs. used      1976-03-11      last obs. used      2021-01-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52441      source      ORB      producer      Otto Matic      solution date      2021-Jan-16 06:03:18   Additional Information  Earth MOID = .425695 au   Jupiter MOID = 3.60337 au   T_jup = 4.201  [ 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 14.9   n/a MPO267727   diameter diameter 3.499 km 0.095 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2012ApJ...760L..12M)   rotation period rot_per 2.892 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Sarounova, L.; Wolf, M. (1996) Icarus 124, 471-482.] [Pravec, P.; Wolf, M.; Sarounova, L. (1998) Icarus 136, 124-153.] [Kaasalainen, M.; et al. (2004) Icarus 167, 178-196.] geometric albedo albedo 0.132   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2012ApJ...760L..12M)   SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 4957 Brucemurray (1990 XJ)          Discovered 1990-Dec-15 by Helin, E. F. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-26 19:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin