+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1618 Dawn (1948 NF) Classification: Main-belt Asteroid          SPK-ID: 2001618 [ 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 .02766482803540306 2.837e-08   a 2.868001889559213 9.6203e-09 au q 2.788659110479347 8.4065e-08 au i 3.224914814414412 3.081e-06 deg node 102.9284970211886 8.0281e-05 deg peri 183.318467162602 0.00011997 deg M 287.9777524890322 9.0186e-05 deg tp 2459355.421040090193 (2021-May-20.92104009) 0.00044444 TDB period 1774.057028878638 4.86 8.9262e-06 2.444e-08 d yr n .202924705429313 1.021e-09 deg/d Q 2.947344668639079 9.8864e-09 au   Orbit Determination Parameters    # obs. used (total)      3020      data-arc span      34168 days (93.55 yr)      first obs. used      1927-02-09      last obs. used      2020-08-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42753      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:17:09   Additional Information  Earth MOID = 1.77224 au   Jupiter MOID = 2.08314 au   T_jup = 3.296  [ 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 11.2   n/a MPO384762   diameter diameter 17.495 km 0.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 43.64 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Slivan, S.M.; Binzel, R.P.; Boroumand, S.C.; Pan M.W.; et al. (2008) Icarus 195, 226-276.] [Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.] [Polakis, T. (2020) Minor Planet Bull. 47, 314-321.] geometric albedo albedo 0.145   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B S   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) 1618 Dawn (1948 NF)          Discovered 1948-Jul-05 by Johnson, E. L. at Johannesburg (UO) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1948 NF = 1927 CF = 1951 AK = 1952 HF = 1964 VH2 = 1964 VV  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-21 06:35 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin