+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1151 Ithaka (1929 RK) Classification: Main-belt Asteroid          SPK-ID: 2001151 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2756517543512074 3.2159e-08   a 2.406583837168507 6.5718e-09 au q 1.743204780459748 7.6643e-08 au i 6.563781036933366 4.3475e-06 deg node 225.4081306011774 2.6694e-05 deg peri 122.4917586763552 2.7785e-05 deg M 116.4868131202121 8.5574e-06 deg tp 2458559.260703591826 (2019-Mar-16.76070359) 3.1519e-05 TDB period 1363.640591171609 3.73 5.5856e-06 1.529e-08 d yr n .2639991815517139 1.0814e-09 deg/d Q 3.069962893877267 8.3833e-09 au   Orbit Determination Parameters    # obs. used (total)      2321      data-arc span      33306 days (91.19 yr)      first obs. used      1929-09-08      last obs. used      2020-11-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47909      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:58:41   Additional Information  Earth MOID = .747985 au   Jupiter MOID = 2.41085 au   T_jup = 3.461  [ 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 13.1   n/a MPO435706   diameter diameter 12.120 km 0.100 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 4.93115 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2011) http://www.asu.cas.cz/~ppravec/neo.htm] [Aymami, J.M. (2012) Minor Planet Bull. 39, 29.] [Franco, L.; Ferrero, A.; Durkee, R.I. (2012) Minor Planet Bull. 39, 47-48.] geometric albedo albedo 0.069   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   1151 Ithaka (1929 RK)          Discovered 1929-Sep-08 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1929 RK = 1966 LA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-23 03:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin