+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1647 Menelaus (1957 MK) Classification: Jupiter Trojan          SPK-ID: 2001647 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02115374891475568 4.4413e-08   a 5.211199187900901 7.239e-08 au q 5.100962788735266 2.1689e-07 au i 5.650388056877762 3.6712e-06 deg node 240.3054615821423 4.7646e-05 deg peri 296.4093423310708 0.00010769 deg M 170.0960530536564 9.8844e-05 deg tp 2456947.463489994276 (2014-Oct-16.96348999) 0.0011725 TDB period 4345.151638344691 11.90 9.054e-05 2.479e-07 d yr n .08285096354822359 1.7264e-09 deg/d Q 5.321435587066535 7.3922e-08 au   Orbit Determination Parameters    # obs. used (total)      2134      data-arc span      25205 days (69.01 yr)      first obs. used      1951-11-08      last obs. used      2020-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4594      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:01:54   Additional Information  Earth MOID = 4.1081 au   Jupiter MOID = .153288 au   T_jup = 2.990  [ 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 10.5   n/a MPO416723   diameter diameter 42.716 km 0.517 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 17.74 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Stephens, R.D.; Coley, D.R.; Warner, B.D.; French, L.M. (2016) Minor Planet Bull. 43, 323-331.] [Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.] geometric albedo albedo 0.056   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   1647 Menelaus (1957 MK)          Discovered 1957-Jun-23 by Nicholson, S. B. at Mount Wilson Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-21 09:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin