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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 ]

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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 90 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1661570744186088 3.0006e-08  
a 2.586724335555877 3.2828e-09 au
q 2.156921787632492 7.8153e-08 au
i 9.120760668894773 3.4939e-06 deg
node 86.12377168591323 2.0222e-05 deg
peri 97.75090806380918 2.2794e-05 deg
M 307.2219149495103 1.0971e-05 deg
tp 2459423.279270796009
(2021-Jul-27.77927080)
4.6384e-05 TDB
period 1519.580284313837
4.16
2.8927e-06
7.92e-09
d
yr
n .2369075222389827 4.5099e-10 deg/d
Q 3.016526883479261 3.8282e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2904  
   data-arc span      61971 days (169.67 yr)  
   first obs. used      1851-05-20  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54945  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:42:38  

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.DBLast 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 ]
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