+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   243 Ida (A884 SB) Classification: Main-belt Asteroid          SPK-ID: 2000243 [ 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 158 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04366940784130571 1.655e-08   a 2.862041821119725 4.6052e-09 au q 2.737058149574374 4.9291e-08 au i 1.130176564803244 1.4369e-07 deg node 323.6337985163116 2.9506e-05 deg peri 113.9413599777092 3.4391e-05 deg M 41.61153374870766 1.9759e-05 deg tp 2459192.079892174372 (2020-Dec-08.57989217) 9.7293e-05 TDB period 1768.52983265755 4.84 4.2685e-06 1.169e-08 d yr n .203558907151163 4.9131e-10 deg/d Q 2.987025492665076 4.8064e-09 au   Orbit Determination Parameters    # obs. used (total)      4477      data-arc span      49794 days (136.33 yr)      first obs. used      1885-01-18      last obs. used      2021-05-19      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42524      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 10:45:34   Additional Information  Earth MOID = 1.75243 au   Jupiter MOID = 2.1183 au   T_jup = 3.300  [ 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 9.93   n/a MPCxxxxx IRAS observations used: 13 diameter diameter 32 km n/a Belton et al. (1995) Yeomans E-mail 2001-Apr-04 extent extent 59.8x25.4x18.6 km n/a Thomas et al. (1996) Icarus v.120, pp.20-32 fit ellipsoid GM GM 0.00275 km^3/s^2 0.00035 Belton et al. (1996) Icarus v.120, pp.185-199 0.0024 < GM < 0.0031 bulk density density 2.6 g/cm^3 0.5 Belton et al. (1996) Icarus v.120, pp.185-199   rotation period rot_per 4.634 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Binzel, R.P. (1987) Icarus 72, 135-208.] [Binzel, R.P.; Slivan, S.M.; Magnusson, P.; Wisniewski, W.Z.; et al. (1993) Icarus 105, 310-325.] [Davies, M.E.; Colvin, T.R.; Belton, M.J.S.; Veverka, J.; Thomas, P.C. (1996) Icarus 120, 33-37.] [Cieza, L.A.; Ciliberti, L.N.; Iserte, J.A. (1999) IAPPP Comm. #74, 12-23.] [Kaasalainen, M.; Torppa, J.; Muinonen, K. (2001) Icarus 153, 37-51.] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Proyecto ECLA (Silvia Alonso Perez) (2011) http://www.geocities.com/proyectoecla/] [Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.] [Polakis, T. (2020) Minor Planet Bull. 47, 13-17.] geometric albedo albedo 0.262   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.802   0.009 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=.81, mean=6.76, max.=14.56) deg. U-B UB 0.416   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=.81, mean=5.40, max.=14.56) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 243 Ida (A884 SB)          Discovered 1884-Sep-29 by Palisa, J. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A884 SB = 1988 DB1 = A910 CD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-25 16:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin