+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   7 Iris Classification: Main-belt Asteroid          SPK-ID: 2000007 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 103 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2304693406741357 1.8241e-08   a 2.386283142335684 1.6303e-09 AU q 1.836318039859775 4.3527e-08 AU i 5.524500323370226 2.4628e-06 deg node 259.6371486486657 2.6129e-05 deg peri 145.3809996002838 2.6703e-05 deg M 271.7931201269842 5.7476e-06 deg tp 2456730.399263558923 (2014-Mar-13.89926356) 2.1692e-05 JED period 1346.422581233874 3.69 1.3798e-06 3.778e-09 d yr n .2673751948441719 2.74e-10 deg/d Q 2.936248244811594 2.006e-09 AU   Orbit Determination Parameters    # obs. used (total)      4774      # delay obs. used      2      # Doppler obs. used      0      data-arc span      60126 days (164.62 yr)      first obs. used      1848-08-23      last obs. used      2013-04-06      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .49991      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:31:19   Additional Information  Earth MOID = .848366 AU   T_jup = 3.492  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 5.51 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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 Asteroid Lightcurve DataBase (Rev. 2013-May-01) 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&A...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.] [Ostro, S.J.; Magri, C.; Benner, L.A.M.; Giorgini, J.D.; et al. (2010) Icarus 207, 285-294.] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.] geometric albedo albedo 0.2766   0.030 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 18 B-V BV .855 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=13; phase (min.=4.28, mean=18.27, max.=32.31) deg. U-B UB .484 mag .047 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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          Discovered 1847-Aug-13 by Hind, J. R. at London Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-26 07:51 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin