+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   42 Isis (A856 KB) Classification: Main-belt Asteroid          SPK-ID: 2000042 [ 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 105 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2230467678627158 2.8944e-08   a 2.442059507991996 3.1246e-09 au q 1.897366027805967 7.0909e-08 au i 8.514364351055043 3.3522e-06 deg node 84.19775098045095 2.1331e-05 deg peri 237.2569090770828 2.2614e-05 deg M 306.8146352032637 9.2665e-06 deg tp 2459206.431333808153 (2020-Dec-22.93133381) 3.6114e-05 TDB period 1393.903763831744 3.82 2.6752e-06 7.324e-09 d yr n .2582674710701585 4.9567e-10 deg/d Q 2.986752988178024 3.8215e-09 au   Orbit Determination Parameters    # obs. used (total)      3010      data-arc span      59993 days (164.25 yr)      first obs. used      1856-06-20      last obs. used      2020-09-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54405      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:34:02   Additional Information  Earth MOID = .900072 au   Jupiter MOID = 2.35898 au   T_jup = 3.452  [ hide covariance matrix ] Orbital Elements at Epoch 2452543.5 (2002-Sep-26.0) TDB Reference: JPL 105 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2236122711699769 2.9161e-08   q 1.895080874880974 7.1502e-08 au tp 2452232.310638861143 (2001-Nov-18.81063886) 2.8876e-05 TDB node 84.56873745929333 2.1219e-05 deg peri 235.9369587764682 2.2506e-05 deg i 8.538371700864706 3.3622e-06 deg   Orbit Determination Parameters    # obs. used (total)      3010      data-arc span      59993 days (164.25 yr)      first obs. used      1856-06-20      last obs. used      2020-09-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54405      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:34:02   Additional Information  Jupiter MOID = 2.35898 au   T_jup = 3.452  Orbit Covariance (6×6)   e q tp node peri i e 8.503699219100681E-16 -2.083732319279383E-15 -6.824726421744999E-14 1.9454769725634E-15 -2.704751539511652E-14 -4.258119807575356E-16 q -2.083732319279383E-15 5.112528284377342E-15 1.951865598097078E-13 -4.850099688997763E-15 7.370728614781491E-14 1.056329933403332E-15 tp -6.824726421744999E-14 1.951865598097078E-13 8.338096952309716E-10 -4.783562703604037E-12 2.271452455217201E-10 -2.149288220887646E-13 node 1.9454769725634E-15 -4.850099688997763E-15 -4.783562703604037E-12 4.502616753203675E-10 -4.457889917799918E-10 2.790842131540492E-12 peri -2.704751539511652E-14 7.370728614781491E-14 2.271452455217201E-10 -4.457889917799918E-10 5.065357155493641E-10 -2.83140190839253E-12 i -4.258119807575356E-16 1.056329933403332E-15 -2.149288220887646E-13 2.790842131540492E-12 -2.83140190839253E-12 1.130424186174023E-11 [ 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 7.5   n/a MPO473760 IRAS observations used: 4 diameter diameter 110.997 km 1.378 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 13.590 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J. (1979) Icarus 38, 100-105.] [Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.] [Denchev, P.; Magnusson, P.; Donchev, Z. (1998) Planet. Space Sci. 46, 673-682.] [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] [Cellino, A.; Hestroffer, D.; Lu, X.-P.; Muinonen, K.; Tanga, P. (2019) Astron. Astrophys. 631, A67.] geometric albedo albedo 0.139   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.874   0.012 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=11; phase (min.=5.87, mean=12.60, max.=23.06) deg. U-B UB 0.462   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=11; phase (min.=5.87, mean=12.60, max.=23.06) 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 L   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) 42 Isis (A856 KB)          Discovered 1856-May-23 by Pogson, N. R. at Oxford Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2053-Dec-08 17:02 < 00:01 Hebe 0.0136922341853007 0.0136915988277546 0.0136928695990172 5.13442540209572 5.1344253136674 2471245.209385193 0.243244625305867 75.3173804688942 24.3431754030058 73.4840028752214 81007.1144731222 T 105 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:11 2020-Nov-13 04:34 Alternate Designations  A856 KB = 1939 GM = 1950 DD1 = A910 TA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-20 23:53 UT (server date/time)   Site Manager:   Ryan S. 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