+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   655 Briseis (A907 VT) Classification: Main-belt Asteroid          SPK-ID: 2000655 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08355470594550329 3.0772e-08   a 2.989212446246607 1.0495e-08 au q 2.739449679291833 9.495e-08 au i 6.513422409067594 3.8551e-06 deg node 129.8482952642953 3.0208e-05 deg peri 281.150956821479 3.9148e-05 deg M 310.5670347366625 2.563e-05 deg tp 2459459.707618254075 (2021-Sep-02.20761825) 0.00013474 TDB period 1887.702711629054 5.17 9.9416e-06 2.722e-08 d yr n .1907079953756736 1.0044e-09 deg/d Q 3.23897521320138 1.1372e-08 au   Orbit Determination Parameters    # obs. used (total)      3476      data-arc span      41341 days (113.19 yr)      first obs. used      1907-11-14      last obs. used      2021-01-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .3921      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:48:32   Additional Information  Earth MOID = 1.75895 au   Jupiter MOID = 2.06144 au   T_jup = 3.242  [ 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 10.02   n/a E2021B10   diameter diameter 29.057 km 0.273 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 160.66 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Stephens, R.D. (2008) Minor Planet Bull. 35, 178-179.] geometric albedo albedo 0.302   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   655 Briseis (A907 VT)          Discovered 1907-Nov-04 by Metcalf, J. H. at Taunton Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A907 VT = 1950 CN = A909 DK  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-03 03:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin