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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 ]

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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 93 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1661570835816903 1.6146e-08  
a 2.586724324096696 2.6069e-09 au
q 2.15692175437497 4.195e-08 au
i 9.120762169970471 4.1298e-07 deg
node 86.12375341188419 3.5292e-06 deg
peri 97.7509426596983 8.0998e-06 deg
M 307.2219095122974 9.6706e-06 deg
tp 2459423.279292266423
(2021-Jul-27.77929227)
4.1003e-05 TDB
period 1519.580274216233
4.16
2.2971e-06
6.289e-09
d
yr
n .236907523813232 3.5813e-10 deg/d
Q 3.016526893818423 3.04e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2949  
   data-arc span      62028 days (169.82 yr)  
   first obs. used      1851-05-20  
   last obs. used      2021-03-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54966  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:43:22  

Additional Information
 Earth MOID = 1.1808 au 
 Jupiter MOID = 2.00622 au 
 T_jup = 3.385 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457124.5 (2015-Apr-12.0) TDB
Reference: JPL 93 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1661878734655266 1.6185e-08  
q 2.156631903627267 4.2049e-08 au
tp 2456386.239069817793
(2013-Apr-03.73906982)
3.8677e-05 TDB
node 86.15615230325432 3.5317e-06 deg
peri 98.01095152418497 8.0889e-06 deg
i 9.118007513282221 4.1278e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2949  
   data-arc span      62028 days (169.82 yr)  
   first obs. used      1851-05-20  
   last obs. used      2021-03-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54966  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 17:43:22  

Additional Information
 Jupiter MOID = 2.00622 au 
 T_jup = 3.385 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.619405901652592E-16 -6.796427065980336E-16 -3.945634205078572E-14 3.347659639222417E-15 -6.744024331993369E-15 -2.229154809833716E-15
q -6.796427065980336E-16 1.768106508597037E-15 1.394598829392027E-13 -9.73716827519706E-15 2.518262642189069E-14 5.804207772185386E-15
tp -3.945634205078572E-14 1.394598829392027E-13 1.495897310528856E-9 -2.476436988984014E-12 2.874690760089277E-10 8.454460022147353E-13
node 3.347659639222417E-15 -9.73716827519706E-15 -2.476436988984014E-12 1.247275140544988E-11 -1.113813878971515E-11 -5.186970541064385E-13
peri -6.744024331993369E-15 2.518262642189069E-14 2.874690760089277E-10 -1.113813878971515E-11 6.543072945478283E-11 6.078530659316244E-13
i -2.229154809833716E-15 5.804207772185386E-15 8.454460022147353E-13 -5.186970541064385E-13 6.078530659316244E-13 1.703861328478327E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 6.50   n/a MPCxxxxx  
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

Alternate Designations
 A851 KA = 1952 TM = A906 QC = A913 EA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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