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14 Irene
Classification: Main-belt Asteroid          SPK-ID: 2000014
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 83 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1662498749080741 3.0094e-08  
a 2.586377164309712 3.2885e-09 au
q 2.156392284278123 7.8345e-08 au
i 9.12144806618501 3.5082e-06 deg
node 86.12399162562986 2.0436e-05 deg
peri 97.80167045468019 2.3004e-05 deg
M 259.7957130064904 1.1035e-05 deg
tp 2459423.382792797570
(2021-Jul-27.88279280)
4.6721e-05 TDB
period 1519.274374129183
4.16
2.8976e-06
7.933e-09
d
yr
n .2369552242374553 4.5193e-10 deg/d
Q 3.016362044341301 3.8352e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2775  
   data-arc span      61593 days (168.63 yr)  
   first obs. used      1851-05-20  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53796  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:11:46  

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          Discovered 1851-May-19 by Hind, J. R. at London
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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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
2049-Apr-29 12:06 00:02 Ceres 0.0487470425744889 0.0487463426698581 0.0487477424821664 1.2864437224075 1.28643698560619 2469561.004353886 2.07653175063019 38.2362010596276 21.2737157995471 -42.5220076745194 251466.53746576 T 83 CATAB v2.0f-lin.ifort 2020-Jan-28 17:12:43 2020-Jan-28 17:12

Alternate Designations
 1952 TM = A906 QC = A913 EA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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