+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1573312363531731 3.3876e-08   a 2.376975573178722 7.2511e-09 au q 2.003003067469221 7.8823e-08 au i 7.678154086812014 3.8392e-06 deg node 34.65513279722946 2.5495e-05 deg peri 95.63344672247604 2.824e-05 deg M 216.480734907209 1.3042e-05 deg tp 2459734.133648114881 (2022-Jun-03.63364811) 4.9549e-05 TDB period 1338.55279426878 3.66 6.125e-06 1.677e-08 d yr n .2689471805231706 1.2307e-09 deg/d Q 2.750948078888223 8.3919e-09 au   Orbit Determination Parameters    # obs. used (total)      2381      data-arc span      28765 days (78.75 yr)      first obs. used      1942-03-12      last obs. used      2020-12-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44297      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:10:39   Additional Information  Earth MOID = 1.03458 au   Jupiter MOID = 2.32291 au   T_jup = 3.512  [ 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 13.36   n/a E2021B10   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. 2020-October); Warner et al., 2009 Published Reference List: [Hayes-Gehrke, M.N.; Singh, A.; Malwitz, A.; Wilson, C.; et al. (2019) Minor Planet Bull. 46, 385-386.] [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 ] 2021-Feb-24 20:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin