+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 92 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1661570836268236 1.6146e-08   a 2.5867243241536 2.61e-09 au q 2.156921754305672 4.1951e-08 au i 9.120762170100114 4.1299e-07 deg node 86.12375340368366 3.5293e-06 deg peri 97.75094276443112 8.104e-06 deg M 307.2219093712852 9.6769e-06 deg tp 2459423.279292868995 (2021-Jul-27.77929287) 4.103e-05 TDB period 1519.580274266376 4.16 2.2999e-06 6.297e-09 d yr n .2369075238054147 3.5856e-10 deg/d Q 3.016526894001529 3.0437e-09 au   Orbit Determination Parameters    # obs. used (total)      2946      data-arc span      62027 days (169.82 yr)      first obs. used      1851-05-20      last obs. used      2021-03-16      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .5499      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 10:09:30   Additional Information  Earth MOID = 1.1808 au   Jupiter MOID = 2.00622 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 6.49   n/a E2021B10   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. 2020-October); 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 ] 2021-Apr-23 01:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin