+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1938 Lausanna (1974 HC) Classification: Main-belt Asteroid          SPK-ID: 2001938 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1591493807145304 2.8857e-08   a 2.236729643309324 5.7633e-09 au q 1.880755505750813 6.4172e-08 au i 3.333833032528151 3.7267e-06 deg node 171.6677201803638 5.229e-05 deg peri 64.88818315696983 5.37e-05 deg M 263.778201536367 1.3859e-05 deg tp 2459327.080038785307 (2021-Apr-22.58003879) 4.7579e-05 TDB period 1221.852177364422 3.35 4.7224e-06 1.293e-08 d yr n .2946346593059502 1.1388e-09 deg/d Q 2.592703780867835 6.6805e-09 au   Orbit Determination Parameters    # obs. used (total)      3035      data-arc span      31602 days (86.52 yr)      first obs. used      1934-05-10      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44032      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 19:41:15   Additional Information  Earth MOID = .872132 au   Jupiter MOID = 2.40752 au   T_jup = 3.619  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.5   n/a MPO412178   diameter diameter 7.638 km 0.124 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 2.7481 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Warell, J.; Pappini, R. (2015) Minor Planet Bull. 42, 20-21.] [Skiff, B.A.; McLelland, K.P.; Sanborn, J.J.; Pravec, P.; Koehn, B.W. (2019) Minor Plantet Bull. 46, 238-265.] geometric albedo albedo 0.192   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1938 Lausanna (1974 HC)          Discovered 1974-Apr-19 by Wild, P. at Zimmerwald Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1974 HC = 1934 KA = 1947 DB = 1950 CO = 1955 VK = 1957 EH = 1962 WB1 = 1967 ED1 = 1971 OX = 1972 XY1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-28 05:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin