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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .29631477898067 1.9063e-08  
a 3.128287423104658 1.0271e-08 au
q 2.201329626739391 5.986e-08 au
i 5.419152195692694 1.0363e-06 deg
node 160.3989487645784 1.3334e-05 deg
peri 131.3129945380049 1.4299e-05 deg
M 101.7001585120376 3.164e-06 deg
tp 2458825.577013526104
(2019-Dec-08.07701353)
1.5634e-05 TDB
period 2020.963173880157
5.53
9.9534e-06
2.725e-08
d
yr
n .1781328846823153 8.7732e-10 deg/d
Q 4.055245219469924 1.3315e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3558  
   data-arc span      30888 days (84.57 yr)  
   first obs. used      1936-08-25  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43475  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:34:31  

Additional Information
 Earth MOID = 1.18946 au 
 Jupiter MOID = 1.21566 au 
 T_jup = 3.138 
[ 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 11.41   n/a E2021B10  
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. 2020-October); 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

[ hide close-approach data ]
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
1967-Feb-05 01:00 < 00:01 Jupiter 1.33279148237711 1.33279080963222 1.3327921551576 0.604904696501184 n/a 2439526.541822293 0.914838678158072 361.455658899458 10.007056708441 84.9156572148502 19838716.7209664 F 42 CATAB v2.0g-lin.ifort 2021-Jul-08 11:35:36 2021-Jul-08 11:35
1977-Aug-13 15:15 < 00:01 Jupiter 1.33793225554412 1.33793178938343 1.33793272183601 0.202967439351835 n/a 2443369.135332041 0.68958158712331 706.910065895859 8.23727875558338 88.2375024821924 24278095.3186058 F 42 CATAB v2.0g-lin.ifort 2021-Jul-08 11:35:36 2021-Jul-08 11:35
2051-May-20 19:46 < 00:01 Jupiter 1.82765190525892 1.82765131076859 1.82765249974986 1.66141402743216 1.35403086951179 2470312.323648876 0.671377498559495 92.8852361506165 23.9629884400134 67.4256211409111 4838106.05315304 T 42 CATAB v2.0g-lin.ifort 2021-Jul-08 11:35:36 2021-Jul-08 11:35
2061-Oct-04 13:59 < 00:01 Jupiter 1.22925543703669 1.22925517551594 1.22925569855998 0.688793176050431 n/a 2474102.082606430 0.775935097966758 97.5111285295605 5.3604986725067 82.9865130483048 34036100.7969583 F 42 CATAB v2.0g-lin.ifort 2021-Jul-08 11:35:36 2021-Jul-08 11:35
2072-Mar-12 00:23 00:01 Jupiter 1.51472891005443 1.514727822328 1.51472999778195 0.561468435168327 n/a 2477913.516281901 1.45041395027412 85.2712283134144 13.0110908849487 51.3296270810078 13693084.4696796 F 42 CATAB v2.0g-lin.ifort 2021-Jul-08 11:35:36 2021-Jul-08 11:35
2145-Dec-27 19:59 00:03 Jupiter 1.62889472256656 1.62889247378826 1.62889697150495 1.21105031995772 0.653181634285522 2504866.332808342 2.60555141342202 1815.17591121266 114.960280015257 44.2566864778967 6906069.34448117 T 42 CATAB v2.0g-lin.ifort 2021-Jul-08 11:35:36 2021-Jul-08 11:35
2156-Jun-23 12:53 00:02 Jupiter 1.21669425967265 1.21669391375265 1.2166946055959 0.734235511429083 n/a 2508697.036692826 2.35452186297109 159.113580896854 13.4289091813814 -86.0843752240102 13517205.3643447 F 42 CATAB v2.0g-lin.ifort 2021-Jul-08 11:35:36 2021-Jul-08 11:35
2166-Oct-06 11:59 00:04 Jupiter 1.7189902005 1.71898737587422 1.71899302509265 1.50317067530487 1.12873097295822 2512453.999014785 3.62153155902372 882.998854053902 18.6426567017844 8.55726306891128 1444917.60087957 T 42 CATAB v2.0g-lin.ifort 2021-Jul-08 11:35:36 2021-Jul-08 11:35

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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