+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   14 Irene (A851 KA) Classification: Main-belt Asteroid          SPK-ID: 2000014 [ 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 86 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1662498750145228 3.0044e-08   a 2.586377164029374 3.2642e-09 au q 2.156392283769074 7.8232e-08 au i 9.121447902323007 3.5e-06 deg node 86.1239922314157 2.0298e-05 deg peri 97.80167107611945 2.2863e-05 deg M 259.795712233358 1.1002e-05 deg tp 2459423.382795991594 (2021-Jul-27.88279599) 4.658e-05 TDB period 1519.274373882171 4.16 2.8761e-06 7.874e-09 d yr n .2369552242759807 4.4858e-10 deg/d Q 3.016362044289673 3.8068e-09 au   Orbit Determination Parameters    # obs. used (total)      2876      data-arc span      61887 days (169.44 yr)      first obs. used      1851-05-20      last obs. used      2020-10-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53817      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:34:21   Additional Information  Earth MOID = 1.18081 au   Jupiter MOID = 2.00739 au   T_jup = 3.385  [ show covariance matrix ] [ 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 6.5   n/a MPO502153   diameter diameter 152 km n/a Dunham occult. list: Dunham 1998: 167x139 km Yeomans E-mail 2001-Apr-04 rotation period rot_per 15.028 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Bel'skaya, I.N.; Dovgopol, A.N.; Erikson, A.; Lagerkvist, C.-I.; Oja, T. (1993) Astron. Astrophys. Suppl. Ser. 101, 507-511.] [Pilcher, F. (2009) Minor Planet Bull. 36, 133-136.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Aymami, J.M. (2012) Minor Planet Bull. 39, 179-181.] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] geometric albedo albedo 0.159   n/a EAR-A-5-DDR-ALBEDOS-V1.0:TRIAD TRIAD quality code 3 B-V BV 0.833   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=13; phase (min.=1.04, mean=8.54, max.=23.04) deg. U-B UB 0.388   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=10; phase (min.=1.04, mean=8.02, max.=23.04) 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) 14 Irene (A851 KA)          Discovered 1851-May-19 by Hind, J. R. at London Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A851 KA = 1952 TM = A906 QC = A913 EA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Dec-01 11:33 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin