+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 49 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .145339121859057 1.6085e-08   a 3.337702612457366 1.3979e-08 au q 2.852603845736132 5.4843e-08 au i 9.833693953649099 3.1627e-07 deg node 206.7191335875758 3.9017e-06 deg peri 187.8968514595011 7.66e-06 deg M 10.21879601363191 5.3514e-06 deg tp 2459137.278162524609 (2020-Oct-14.77816252) 3.2893e-05 TDB period 2227.25470405507 6.10 1.3992e-05 3.831e-08 d yr n .1616339610124352 1.0154e-09 deg/d Q 3.8228013791786 1.6011e-08 au   Orbit Determination Parameters    # obs. used (total)      3218      data-arc span      42879 days (117.40 yr)      first obs. used      1903-10-27      last obs. used      2021-03-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41936      source      ORB      producer      Otto Matic      solution date      2021-May-03 20:39:11   Additional Information  Earth MOID = 1.85825 au   Jupiter MOID = 1.6154 au   T_jup = 3.120  [ 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 10.96   n/a MPCxxxxx   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-May-12 06:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin