+ 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 | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2376867129669572 3.8344e-08   a 2.593245467757524 6.5451e-09 au q 1.976865476609779 9.8299e-08 au i 7.58364353402012 4.3197e-06 deg node 215.4026968970457 2.4122e-05 deg peri 173.9551072592177 2.5022e-05 deg M 233.4504129388188 8.4274e-06 deg tp 2459536.694185026626 (2021-Nov-18.19418503) 3.6838e-05 TDB period 1525.330197373649 4.18 5.7747e-06 1.581e-08 d yr n .2360144712402972 8.9351e-10 deg/d Q 3.20962545890527 8.1008e-09 au   Orbit Determination Parameters    # obs. used (total)      2814      data-arc span      40871 days (111.90 yr)      first obs. used      1908-07-23      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42977      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:18:29   Additional Information  Earth MOID = .982426 au   Jupiter MOID = 2.238 au   T_jup = 3.366  [ 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 10.7   n/a MPO384750   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. 2019-August); 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.] 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 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-08 18:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin