+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   695 Bella (A909 VD) Classification: Main-belt Asteroid          SPK-ID: 2000695 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1602305845141666 2.7949e-08   a 2.538937523280183 6.5423e-09 au q 2.132122079880049 7.0494e-08 au i 13.8477449567157 1.0279e-06 deg node 275.5252381625296 1.8183e-06 deg peri 80.03285092603033 4.1658e-06 deg M 260.7233990139196 5.9618e-06 deg tp 2459803.993651188947 (2022-Aug-12.49365119) 2.5423e-05 TDB period 1477.666569674253 4.05 5.7115e-06 1.564e-08 d yr n .2436273563929654 9.4167e-10 deg/d Q 2.945752966680316 7.5906e-09 au   Orbit Determination Parameters    # obs. used (total)      3021      data-arc span      39326 days (107.67 yr)      first obs. used      1913-10-25      last obs. used      2021-06-26      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .3562      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 11:26:18   Additional Information  Earth MOID = 1.17661 au   Jupiter MOID = 2.57426 au   T_jup = 3.388  [ 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 9.1   n/a MPO502159 IRAS observations used: 12 diameter diameter 40.620 km 0.671 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 14.222 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.] [Durech, J. (2006) IAU 2006, poster paper.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Byun, Y.-I.; et al. (2014) Astron. J. 147, A56.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.207   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.871   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=10.60 deg. U-B UB 0.408   0.042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=10.60 deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo 695 Bella (A909 VD)          Discovered 1909-Nov-07 by Metcalf, J. H. at Taunton Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A909 VD = 1965 QF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-17 06:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin