+ 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 ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 108 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2230666751737957 1.6237e-08   a 2.442489499753165 2.8067e-09 au q 1.897651487896319 4.0701e-08 au i 8.512863561261003 3.7433e-07 deg node 84.19360298908471 3.0367e-06 deg peri 237.1798443279778 5.6381e-06 deg M 358.5182648002815 7.4652e-06 deg tp 2459206.238727224043 (2020-Dec-22.73872722) 2.892e-05 TDB period 1394.271932696187 3.82 2.4033e-06 6.58e-09 d yr n .258199273440043 4.4505e-10 deg/d Q 2.987327511610011 3.4328e-09 au   Orbit Determination Parameters    # obs. used (total)      3051      data-arc span      59993 days (164.25 yr)      first obs. used      1856-06-20      last obs. used      2020-09-21      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .54659      source      ORB      producer      Otto Matic      solution date      2021-May-03 17:45:44   Additional Information  Earth MOID = .898379 au   Jupiter MOID = 2.35784 au   T_jup = 3.451  [ hide covariance matrix ] Orbital Elements at Epoch 2457080.5 (2015-Feb-27.0) TDB Reference: JPL 108 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2218170225195357 1.6302e-08   q 1.902162476740845 4.076e-08 au tp 2456416.023818944075 (2013-May-03.52381894) 2.5739e-05 TDB node 84.31869340809385 3.0311e-06 deg peri 236.8906678357699 5.6472e-06 deg i 8.517001221494681 3.7476e-07 deg   Orbit Determination Parameters    # obs. used (total)      3051      data-arc span      59993 days (164.25 yr)      first obs. used      1856-06-20      last obs. used      2020-09-21      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .54659      source      ORB      producer      Otto Matic      solution date      2021-May-03 17:45:44   Additional Information  Jupiter MOID = 2.35784 au   T_jup = 3.451  Orbit Covariance (6×6)   e q tp node peri i e 2.657569697028388E-16 -6.637293413065194E-16 -2.294004578174666E-13 -6.032335189092847E-16 -4.091511785133858E-14 -9.52475910234807E-16 q -6.637293413065194E-16 1.661346285077872E-15 5.969130365800842E-13 1.029707062312266E-15 1.07222750076131E-13 2.278260792306212E-15 tp -2.294004578174666E-13 5.969130365800842E-13 6.624980325617295E-10 -1.506977721167705E-12 1.258968902922443E-10 -8.624175013699471E-13 node -6.032335189092847E-16 1.029707062312266E-15 -1.506977721167705E-12 9.187278546336994E-12 -8.545088745241712E-12 5.990304577975745E-13 peri -4.091511785133858E-14 1.07222750076131E-13 1.258968902922443E-10 -8.545088745241712E-12 3.189102610607295E-11 -7.62976286786193E-13 i -9.52475910234807E-16 2.278260792306212E-15 -8.624175013699471E-13 5.990304577975745E-13 -7.62976286786193E-13 1.404462668161164E-13 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 7.58   n/a E2021B10 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 Alternate Designations  A856 KB = 1939 GM = 1950 DD1 = A910 TA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jun-22 00:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin