+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1917 Cuyo (1968 AA) Classification: Amor [NEO]          SPK-ID: 2001917 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 465 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5055075486188304 3.2508e-08   a 2.149076811635364 5.3115e-09 au q 1.062702260791999 7.0324e-08 au i 23.95916227254964 4.0332e-06 deg node 188.3070349840897 7.7812e-06 deg peri 194.5059486453876 8.3341e-06 deg M 254.6226996541615 7.2285e-06 deg tp 2459337.337861606959 (2021-May-02.83786161) 2.4164e-05 TDB period 1150.737680511229 3.15 4.2661e-06 1.168e-08 d yr n .3128428017061766 1.1598e-09 deg/d Q 3.235451362478729 7.9965e-09 au   Orbit Determination Parameters    # obs. used (total)      2349      # delay obs. used      0      # Doppler obs. used      2      data-arc span      24250 days (66.39 yr)      first obs. used      1954-05-06      last obs. used      2020-09-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4446      source      ORB      producer      Otto Matic      solution date      2020-Oct-01 06:39:15   Additional Information  Earth MOID = .0727329 au   Jupiter MOID = 2.24402 au   T_jup = 3.435  [ 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 14.3   n/a MPO473790   diameter diameter 5.7 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15) rotation period rot_per 2.6890 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Velichko, F.P.; Lupishko, D.F.; Shevchenko, V.G. (1989) Astron. Tsirk. 1541, 35-36.] [Hoffmann, M.; Rebhan, H.; Neukum, G.; Geyer, E.H. (1993) Acta Astronomica 43, 61-67.] [Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.] [Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, Brian D. (2014) Minor Planet Bull. 41, 213-224.] [Warner, B.D. (2015) Minor Planet Bull. 42, 41-53.] [Warner, B.D. (2017) Minor Planet Bull. 44, 335-344.] geometric albedo albedo 0.195   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   SMASSII spectral type spec_B Sl   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) 1917 Cuyo (1968 AA)          Discovered 1968-Jan-01 by Cesco, C. U. and Samuel, A. at El Leoncito Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 12:33 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin