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794 Irenaea (A914 QB)
Classification: Main-belt Asteroid          SPK-ID: 2000794
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2965787939733161 3.095e-08  
a 3.128120051907028 1.2255e-08 au
q 2.200385979508695 9.9368e-08 au
i 5.41925284081934 3.9993e-06 deg
node 160.4026680761009 3.6573e-05 deg
peri 131.2747284710536 3.7063e-05 deg
M 31.15989197215705 6.6482e-06 deg
tp 2458825.589054370869
(2019-Dec-08.08905437)
3.6873e-05 TDB
period 2020.80098617647
5.53
1.1875e-05
3.251e-08
d
yr
n .1781471814704283 1.0469e-09 deg/d
Q 4.055854124305363 1.5889e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2997  
   data-arc span      30660 days (83.94 yr)  
   first obs. used      1936-08-25  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4615  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:22:34  

Additional Information
 Earth MOID = 1.18891 au 
 Jupiter MOID = 1.21624 au 
 T_jup = 3.138 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456313.5 (2013-Jan-21.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2960771895679342 3.0918e-08  
q 2.202125249331231 9.9239e-08 au
tp 2456807.164723772582
(2014-May-29.66472377)
3.41e-05 TDB
node 160.4651626772692 3.6574e-05 deg
peri 131.7102282487973 3.7068e-05 deg
i 5.418557032778351 3.9992e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2997  
   data-arc span      30660 days (83.94 yr)  
   first obs. used      1936-08-25  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4615  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:22:34  

Additional Information
 Jupiter MOID = 1.21624 au 
 T_jup = 3.138 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.559275073356811E-16 -3.057543476755713E-15 9.140802469951707E-14 3.353263955533349E-15 2.471681210713542E-14 -1.502527998943999E-16
q -3.057543476755713E-15 9.848418415843121E-15 -2.63484216945001E-13 -8.601237523791369E-15 -7.932931868984857E-14 1.053373891539115E-15
tp 9.140802469951707E-14 -2.63484216945001E-13 1.162842413208295E-9 -4.328297159923272E-12 2.195812350218204E-10 5.034138252870649E-13
node 3.353263955533349E-15 -8.601237523791369E-15 -4.328297159923272E-12 1.337624956506402E-9 -1.332127522969233E-9 7.140987376640981E-12
peri 2.471681210713542E-14 -7.932931868984857E-14 2.195812350218204E-10 -1.332127522969233E-9 1.374056397966035E-9 -7.052557994466368E-12
i -1.502527998943999E-16 1.053373891539115E-15 5.034138252870649E-13 7.140987376640981E-12 -7.052557994466368E-12 1.599329287116567E-11

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 11.3   n/a MPO313423  
diameter diameter 35.703 km 6.145 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 9.14 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.046   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

794 Irenaea (A914 QB)          Discovered 1914-Aug-27 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A914 QB = 1930 KH = 1936 QK = 1947 QD = 1953 TT2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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