+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2659 Millis (1981 JX) Classification: Main-belt Asteroid          SPK-ID: 2002659 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1018584680013142 1.4517e-08   a 3.136363089277656 1.2751e-08 au q 2.816897949907965 4.5433e-08 au i 1.323145416922919 6.6152e-07 deg node 157.0537246733413 2.2104e-05 deg peri 331.2218124510301 2.497e-05 deg M 160.0066248650709 1.3251e-05 deg tp 2458298.776492305574 (2018-Jun-29.27649231) 7.219e-05 TDB period 2028.793889276376 5.55 1.2372e-05 3.387e-08 d yr n .1774453294160915 1.0821e-09 deg/d Q 3.455828228647347 1.405e-08 au   Orbit Determination Parameters    # obs. used (total)      2630      data-arc span      22875 days (62.63 yr)      first obs. used      1958-02-24      last obs. used      2020-10-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47295      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 14:05:02   Additional Information  Earth MOID = 1.83192 au   Jupiter MOID = 1.58876 au   T_jup = 3.203  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.77   n/a E2021B10   diameter diameter 27.878 km 0.337 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 6.132 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.] [Galad, A. (2010) Astron. Astrophys. 514, A55.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.] geometric albedo albedo 0.050   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   SMASSII spectral type spec_B B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 2659 Millis (1981 JX)          Discovered 1981-May-05 by Bowell, E. at Flagstaff (AM) on plates taken by B. A. Skiff at the Anderson Mesa station of the Lowell Observatory. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1981 JX = 1958 DX = 1972 TP2 = 1978 UK2 = 1978 WX14  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-19 04:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin