+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   197 Arete (A879 KA) Classification: Main-belt Asteroid          SPK-ID: 2000197 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 47 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1639954644938792 1.6912e-08   a 2.73893348089127 6.3779e-09 au q 2.289760812474669 4.7783e-08 au i 8.791082294022235 6.2515e-07 deg node 81.59108213997349 2.9717e-06 deg peri 245.8614140238104 7.5977e-06 deg M 8.916332962252218 4.9666e-06 deg tp 2459159.493336787277 (2020-Nov-05.99333679) 2.2827e-05 TDB period 1655.658084896308 4.53 5.7831e-06 1.583e-08 d yr n .2174361985026313 7.5949e-10 deg/d Q 3.188106149307872 7.4239e-09 au   Orbit Determination Parameters    # obs. used (total)      3438      data-arc span      51723 days (141.61 yr)      first obs. used      1879-05-29      last obs. used      2021-01-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41632      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 10:28:23   Additional Information  Earth MOID = 1.29287 au   Jupiter MOID = 2.17496 au   T_jup = 3.314  [ 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 9.47   n/a E2021B10 IRAS observations used: 16 diameter diameter 31.729 km 0.449 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 6.6084 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Di Martino, M.; Zappala, V.; De Campos, J.A.; Debehogne, H.; Lagerkvist, C.-I. (1987) Astron. Astrophys. Suppl. Ser. 67, 95-101.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.373   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.908   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.91 deg. U-B UB 0.496   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.91 deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 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) 197 Arete (A879 KA)          Discovered 1879-May-21 by Palisa, J. at Pola Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A879 KA = 1934 RE1 = 1950 DY  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 17:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin