+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2976 Lautaro (1974 HR) Classification: Outer Main-belt Asteroid          SPK-ID: 2002976 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .145171275810738 3.4343e-08   a 3.337089865505017 1.83e-08 au q 2.852640272234569 1.198e-07 au i 9.834375488914093 3.8025e-06 deg node 206.7190664130497 1.9056e-05 deg peri 187.8623190325252 2.2423e-05 deg M 337.910808116223 1.0931e-05 deg tp 2459137.124192153929 (2020-Oct-14.62419215) 6.736e-05 TDB period 2226.641401559699 6.10 1.8316e-05 5.015e-08 d yr n .1616784812084381 1.3299e-09 deg/d Q 3.821539458775464 2.0957e-08 au   Orbit Determination Parameters    # obs. used (total)      2912      data-arc span      42755 days (117.06 yr)      first obs. used      1903-10-27      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4342      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:09:21   Additional Information  Earth MOID = 1.85939 au   Jupiter MOID = 1.61556 au   T_jup = 3.121  [ 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 10.8   n/a MPO332845   diameter diameter 46.184 km 0.100 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 17.41 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Shipley, H.; Dillard, A.; Kendall, J.; Reichert, M.; et al. (2008) Minor Planet Bull. 35, 99-101.] geometric albedo albedo 0.044   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   2976 Lautaro (1974 HR)          Discovered 1974-Apr-22 by Torres, C. at Cerro El Roble Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1974 HR = 1953 XA = 1957 NB = 1965 XA = 1972 YP1 = 1977 VV = 1983 TR = A903 UG  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 19:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin