+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   666 Desdemona (A908 OG) Classification: Main-belt Asteroid          SPK-ID: 2000666 [ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2369520831722235 1.0841e-08   a 2.594685314444935 6.0984e-09 au q 1.979869224010832 2.9578e-08 au i 7.580425619975608 3.8743e-07 deg node 215.3172282493699 2.1764e-06 deg peri 173.8493299213449 4.7789e-06 deg M 326.9875143127586 6.7597e-06 deg tp 2459536.491347116696 (2021-Nov-17.99134712) 2.8965e-05 TDB period 1526.600736444633 4.18 5.3821e-06 1.474e-08 d yr n .2358180442375652 8.3138e-10 deg/d Q 3.209501404879038 7.5435e-09 au   Orbit Determination Parameters    # obs. used (total)      3195      data-arc span      41255 days (112.95 yr)      first obs. used      1908-07-23      last obs. used      2021-07-05      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41939      source      ORB      producer      Otto Matic      solution date      2021-Jul-09 13:16:32   Additional Information  Earth MOID = .984692 au   Jupiter MOID = 2.24072 au   T_jup = 3.365  [ 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 10.72   n/a E2021B10   diameter diameter 32.741 km 0.368 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 14.607 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Marciniak, A.; Pilcher, F.; Oszkiewicz, D.; Santana-Ros, T.; et al. (2015) Planet. Space Sci. 118, 256-266.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.095   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   666 Desdemona (A908 OG)          Discovered 1908-Jul-23 by Kopff, A. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-18 16:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin