+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1667 Pels (1930 SY) Classification: Main-belt Asteroid          SPK-ID: 2001667 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .156362909539094 1.9858e-08   a 2.190001896064388 4.5403e-09 au q 1.847566827699628 4.3981e-08 au i 4.616370933001003 5.2345e-07 deg node 80.84836082122102 3.8153e-06 deg peri 196.0659068610462 3.2363e-06 deg M 57.81306954147914 4.9487e-06 deg tp 2459206.397122384185 (2020-Dec-22.89712238) 1.592e-05 TDB period 1183.764094943823 3.24 3.6812e-06 1.008e-08 d yr n .3041146471139456 9.4572e-10 deg/d Q 2.532436964429148 5.2502e-09 au   Orbit Determination Parameters    # obs. used (total)      3207      data-arc span      33155 days (90.77 yr)      first obs. used      1930-09-16      last obs. used      2021-06-25      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40114      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:39:03   Additional Information  Earth MOID = .831532 au   Jupiter MOID = 2.5739 au   T_jup = 3.653  [ 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 11.99   n/a E2021B10   diameter diameter 8.998 km 1.130 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   rotation period rot_per 3.268 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.] [Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; et al. (2012) Astron. Astrophys. 546, A72.] [Stephens, R. D.; Warner, B. D. (2019) MPB 46, 298-301.] [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Stephens, R.D.; Warner, B.D. (2020) Minor Planet Bull. 47, 275-284.] geometric albedo albedo 0.455   0.174 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   SMASSII spectral type spec_B Sa   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) 1667 Pels (1930 SY)          Discovered 1930-Sep-16 by Van Gent, H. at Johannesburg (LS) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1930 SY = 1933 MD = 1936 JA = 1939 FX = 1942 CF = 1949 HM1 = 1952 FC1 = 1953 VT1 = 1953 XD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-26 15:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin