+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1950 Wempe (1942 EO) Classification: Main-belt Asteroid          SPK-ID: 2001950 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08387002288936929 2.9492e-08   a 2.179425888283262 4.6394e-09 au q 1.996637389147261 6.3624e-08 au i 4.220955013820324 2.7476e-06 deg node 69.93149622593484 5.103e-05 deg peri 53.37617927782586 5.5876e-05 deg M 168.8909541519725 2.3606e-05 deg tp 2458449.165114212469 (2018-Nov-26.66511421) 7.6509e-05 TDB period 1175.199464530901 3.22 3.7525e-06 1.027e-08 d yr n .3063309768811881 9.7815e-10 deg/d Q 2.362214387419263 5.0285e-09 au   Orbit Determination Parameters    # obs. used (total)      3094      data-arc span      28728 days (78.65 yr)      first obs. used      1942-03-23      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41244      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:03:38   Additional Information  Earth MOID = 1.01575 au   Jupiter MOID = 2.67608 au   T_jup = 3.674  [ 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 13.2   n/a MPO265967   diameter diameter 6.311 km 1.349 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   rotation period rot_per 16.788 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pray, D.P.; Galad, A.; Gajdos, S.; Vilagi, J.; et al. (2006) Minor Planet Bull. 33, 92-95.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] geometric albedo albedo 0.323   0.092 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   1950 Wempe (1942 EO)          Discovered 1942-Mar-23 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1942 EO = 1968 HH1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-24 21:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin