+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2373384257156968 1.0833e-08   a 2.594610242300263 5.9694e-09 au q 1.978809532046896 2.9558e-08 au i 7.58029820622338 3.8735e-07 deg node 215.3718555591593 2.1783e-06 deg peri 173.863417416373 4.885e-06 deg M 280.7472837806445 6.8615e-06 deg tp 2459536.561122748080 (2021-Nov-18.06112275) 2.9783e-05 TDB period 1526.534483114182 4.18 5.2681e-06 1.442e-08 d yr n .2358282790085343 8.1385e-10 deg/d Q 3.21041095255363 7.3862e-09 au   Orbit Determination Parameters    # obs. used (total)      3117      data-arc span      40994 days (112.24 yr)      first obs. used      1908-07-23      last obs. used      2020-10-17      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42424      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 11:15:22   Additional Information  Earth MOID = .983165 au   Jupiter MOID = 2.23863 au   T_jup = 3.365  [ 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 10.72   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 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jun-24 04:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin