+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   7 Iris (A847 PA) Classification: Main-belt Asteroid          SPK-ID: 2000007 [ 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 113 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2296463643818332 1.9892e-08   a 2.387138679978829 2.2044e-09 au q 1.838940960846443 4.7337e-08 au i 5.518268782925759 2.5805e-06 deg node 259.5404535801335 2.6413e-05 deg peri 145.2407072874994 2.7078e-05 deg M 300.7926185896937 7.067e-06 deg tp 2459422.058417638439 (2021-Jul-26.55841764) 2.6655e-05 TDB period 1347.146731538341 3.69 1.8661e-06 5.109e-09 d yr n .2672314689795571 3.7017e-10 deg/d Q 2.935336399111216 2.7107e-09 au   Orbit Determination Parameters    # obs. used (total)      5229      # delay obs. used      1      # Doppler obs. used      0      data-arc span      62897 days (172.20 yr)      first obs. used      1848-08-23      last obs. used      2020-11-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38188      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:50:22   Additional Information  Earth MOID = .850795 au   Jupiter MOID = 2.47382 au   T_jup = 3.492  [ hide covariance matrix ] Orbital Elements at Epoch 2450129.5 (1996-Feb-16.0) TDB Reference: JPL 113 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2302555035316681 1.985e-08   q 1.836587894249721 4.7286e-08 au tp 2450000.605277101923 (1995-Oct-10.10527710) 2.1506e-05 TDB node 259.9296582649679 2.6367e-05 deg peri 145.2949276252272 2.7036e-05 deg i 5.52320102099305 2.5841e-06 deg   Orbit Determination Parameters    # obs. used (total)      5229      # delay obs. used      1      # Doppler obs. used      0      data-arc span      62897 days (172.20 yr)      first obs. used      1848-08-23      last obs. used      2020-11-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38188      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:50:22   Additional Information  Jupiter MOID = 2.47382 au   T_jup = 3.492  Orbit Covariance (6×6)   e q tp node peri i e 3.940040877371761E-16 -9.380975820865036E-16 3.77449659184365E-14 1.828071639239037E-15 1.178956854307475E-14 6.011074675342831E-16 q -9.380975820865036E-16 2.236007176782945E-15 -8.523732678571909E-14 -4.452895156255874E-15 -2.687502892396952E-14 -1.415836098078261E-15 tp 3.77449659184365E-14 -8.523732678571909E-14 4.62525843771844E-10 -6.148012857838713E-12 1.351080998362341E-10 -7.388694907621385E-13 node 1.828071639239037E-15 -4.452895156255874E-15 -6.148012857838713E-12 6.952017735116066E-10 -6.932879537653506E-10 9.098238385262348E-12 peri 1.178956854307475E-14 -2.687502892396952E-14 1.351080998362341E-10 -6.932879537653506E-10 7.309334763299699E-10 -9.254753264062178E-12 i 6.011074675342831E-16 -1.415836098078261E-15 -7.388694907621385E-13 9.098238385262348E-12 -9.254753264062178E-12 6.677620637798962E-12 [ 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 5.58   n/a E2021B10 IRAS observations used: 18 diameter diameter 199.83 km 10.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18 rotation period rot_per 7.139 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.] [Cailliate, C. (1956) Publ. Observ. Lyon 3, fasc. 28.] [Van Houten-Groeneveld, I.; van Houten, C.J. (1958) Astrophys. J. 127, 253-273.] [Chang, Y.C.; Chang, C.-s. (1963) Acta Astron. Sin. 11, 139-149.] [Taylor, R.C. (1977) Astron. J. 82, 441-444.] [Zhou, X.-z.; Yang, X.-y.; Wu, Z.-x. (1982) Acta Astron. Sin. 23, 349-352; Chin. Astron. Astrophys. 7, 129-131 (1983, 1983ChA...7..129Z).] [Magnusson, P. (1986) Icarus 68, 1-39.] [Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1989) Astron. Astrophys. Suppl. Ser. 78, 519-532.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] [Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Ostro, S.J.; Magri, C.; Benner, L.A.M.; Giorgini, J.D.; et al. (2010) Icarus 207, 285-294.] [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.] [Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] [HanuÅ¡, J.; Marsset, M.; Vernazza, P.; Viikinkoski, M.; et al. (2019) Astron. Astrophys. 624, A121.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.2766   0.030 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18 B-V BV 0.855   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=13; phase (min.=4.28, mean=18.27, max.=32.31) deg. U-B UB 0.484   0.047 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=12; phase (min.=5.26, mean=19.43, max.=32.31) 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) 7 Iris (A847 PA)          Discovered 1847-Aug-13 by Hind, J. R. at London 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 1916-Feb-15 17:06 < 00:01 Thisb 0.0208748997538021 0.0208742573756485 0.0208755421438508 4.76254206479176 4.76254199620954 2420909.212756702 0.125572921091276 44.7016101765171 19.3700763811286 50.7374588487054 132366.74129463 T 113 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:42 2020-Dec-18 01:50 1934-Jul-23 20:09 < 00:01 Thisb 0.0174774465801555 0.0174769970121104 0.0174778961531866 4.86910635964383 4.86910627952262 2427642.339775891 0.103763361924217 36.9248750140936 19.3890011963212 -69.0465507051148 128398.721766418 T 113 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:42 2020-Dec-18 01:50 1952-Dec-27 18:53 < 00:01 Thisb 0.0170498503955299 0.0170494497841322 0.0170502510075829 4.87418162405188 4.87418154200681 2434374.286487601 0.0958626768480437 30.2803498191347 19.4272415993438 78.5229336244832 129698.834054014 T 113 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:42 2020-Dec-18 01:50 1971-May-31 05:20 < 00:01 Thisb 0.0196500591866048 0.0196496456299483 0.019650472743682 4.96315530547151 4.9631552355593 2441102.722304902 0.0857288031693089 24.5454542234985 19.3845204326716 -62.2266051714289 145261.942059247 T 113 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:42 2020-Dec-18 01:50 1989-Nov-05 05:30 < 00:01 Thisb 0.0469037199615904 0.0469032995500599 0.0469041403731443 5.13721129156007 5.13721126326309 2447835.729065700 0.0781834102470365 21.4055992512249 19.3821741870351 -28.6506872695898 335855.493629798 T 113 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:42 2020-Dec-18 01:50 2008-Apr-14 15:09 < 00:01 Thisb 0.0352585547245826 0.0352581225168995 0.03525898693235 5.05572704403928 5.0557270057897 2454571.131279089 0.0796480503484432 22.4614139009818 19.4662081798417 -34.5094494515615 246913.298748052 T 113 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:42 2020-Dec-18 01:50 2026-Sep-19 04:25 < 00:01 Thisb 0.0390835241278257 0.0390830269287814 0.0390840213271766 5.071632500052 5.071632465654 2461302.684246150 0.0805422211604056 26.3083913102615 19.4628634754403 -29.8895924696373 243912.895285143 T 113 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:42 2020-Dec-18 01:50 2133-Sep-11 08:06 < 00:01 Hygie 0.0494758394537722 0.0494748420107793 0.0494768369043007 3.98434136741469 3.98434117141621 2500375.837478853 0.49158103375822 59.6559642659631 19.4212981409849 35.8667428779637 244434.189181258 T 113 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:42 2020-Dec-18 01:50 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-11 10:55 UT (server date/time)   Site Manager:   Ryan S. 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