+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   677 Aaltje (A909 BP) Classification: Main-belt Asteroid          SPK-ID: 2000677 [ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05013509537772785 3.5555e-08   a 2.955518543627235 1.2171e-08 au q 2.80734333955184 1.064e-07 au i 8.486983700789521 3.9313e-06 deg node 272.7129818456211 2.6367e-05 deg peri 275.5960809316275 4.8434e-05 deg M 261.90119404785 4.1942e-05 deg tp 2459506.220059276772 (2021-Oct-18.72005928) 0.00021688 TDB period 1855.876017781923 5.08 1.1464e-05 3.139e-08 d yr n .1939784751517288 1.1982e-09 deg/d Q 3.103693747702629 1.2781e-08 au   Orbit Determination Parameters    # obs. used (total)      3219      data-arc span      41734 days (114.26 yr)      first obs. used      1906-08-13      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4065      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:55:19   Additional Information  Earth MOID = 1.82346 au   Jupiter MOID = 1.96397 au   T_jup = 3.249  [ 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 9.6   n/a MPO502159   diameter diameter 32.403 km 0.442 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 16.608 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Oey, J. (2009) Minor Planet Bull. 36, 162-165.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.313   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   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) 677 Aaltje (A909 BP)          Discovered 1909-Jan-18 by Kopff, A. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A909 BP = A906 PA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-26 12:46 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin