+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1100 Arnica (1928 SD) Classification: Main-belt Asteroid          SPK-ID: 2001100 [ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06970594184526406 3.6112e-08   a 2.89692836863688 1.0434e-08 au q 2.694995248242782 1.0633e-07 au i 1.034757555356616 3.1747e-06 deg node 304.0966477760635 0.0002497 deg peri 24.11561371700505 0.00025187 deg M 247.0546881053253 3.46e-05 deg tp 2459565.529041250616 (2021-Dec-17.02904125) 0.00017354 TDB period 1800.964125362803 4.93 9.7297e-06 2.664e-08 d yr n .1998929323078427 1.0799e-09 deg/d Q 3.098861489030978 1.1161e-08 au   Orbit Determination Parameters    # obs. used (total)      3206      data-arc span      37212 days (101.88 yr)      first obs. used      1918-09-16      last obs. used      2020-08-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40656      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:28:09   Additional Information  Earth MOID = 1.6835 au   Jupiter MOID = 2.13748 au   T_jup = 3.285  [ 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 10.9   n/a MPO439073   diameter diameter 16.894 km 0.243 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 14.535 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Slivan, S.M.; Binzel, R.P.; Boroumand, S.C.; Pan M.W.; et al. (2008) Icarus 195, 226-276.] [Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.] geometric albedo albedo 0.246   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1100 Arnica (1928 SD)          Discovered 1928-Sep-22 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1928 SD = 1950 BU = 1976 MK = 1979 HE = A904 XA = A918 RD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-30 10:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin