+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 123 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .21894379618659 4.1958e-08   a 1.565413234637737 4.2675e-09 au q 1.222675718445422 6.714e-08 au i 35.01006599890055 9.7647e-07 deg node 254.8939278260795 3.0013e-06 deg peri 97.47192008713264 1.6498e-05 deg M 264.6227184496905 2.5799e-05 deg tp 2459586.032795342777 (2022-Jan-06.53279534) 5.1819e-05 TDB period 715.3884574431772 1.96 2.9254e-06 8.009e-09 d yr n .5032231038318011 2.0578e-09 deg/d Q 1.908150750830052 5.2019e-09 au   Orbit Determination Parameters    # obs. used (total)      610      data-arc span      16537 days (45.28 yr)      first obs. used      1976-03-11      last obs. used      2021-06-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51182      source      ORB      producer      Otto Matic      solution date      2021-Jun-21 06:26:00   Additional Information  Earth MOID = .425151 au   Jupiter MOID = 3.60163 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 14.86   n/a MPCxxxxx   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-Jun-23 03:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin