+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3446 Combes (1942 EB) Classification: Main-belt Asteroid          SPK-ID: 2003446 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1566881981300484 3.4025e-08   a 2.378391031804906 7.3339e-09 au q 2.005725226582729 7.9281e-08 au i 7.676665188131865 4.1519e-06 deg node 34.71755813108057 2.5553e-05 deg peri 95.42908266298868 2.8801e-05 deg M 162.8966678640839 1.3639e-05 deg tp 2458394.276155090155 (2018-Oct-02.77615509) 4.9886e-05 TDB period 1339.748608913459 3.67 6.1968e-06 1.697e-08 d yr n .268707127296039 1.2429e-09 deg/d Q 2.751056837027084 8.483e-09 au   Orbit Determination Parameters    # obs. used (total)      2237      data-arc span      28637 days (78.40 yr)      first obs. used      1942-03-12      last obs. used      2020-08-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44492      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 23:03:48   Additional Information  Earth MOID = 1.0374 au   Jupiter MOID = 2.3238 au   T_jup = 3.511  [ 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 13.3   n/a MPO435730   diameter diameter 8.411 km 0.246 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 5.6985 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Hayes-Gehrke, M.N.; Singh, A.; Malwitz, A.; Wilson, C.; et al. (2019) Minor Planet Bull. 46-4, in press.] [Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm] geometric albedo albedo 0.144   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   3446 Combes (1942 EB)          Discovered 1942-Mar-12 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1942 EB = 1975 GL  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-31 00:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin