Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2965787962031322 3.2276e-08  
a 3.12812005109697 1.269e-08 au
q 2.20038597196375 1.0408e-07 au
i 5.419253248136807 4.0115e-06 deg
node 160.402659160668 3.7196e-05 deg
peri 131.2747373854114 3.767e-05 deg
M 31.15989222945872 6.7236e-06 deg
tp 2458825.589052994491
(2019-Dec-08.08905299)
3.7261e-05 TDB
period 2020.800985391509
5.53
1.2296e-05
3.366e-08
d
yr
n .1781471815396279 1.084e-09 deg/d
Q 4.055854130230189 1.6453e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2906  
   data-arc span      30593 days (83.76 yr)  
   first obs. used      1936-08-25  
   last obs. used      2020-05-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46763  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:21:00  

Additional Information
 Earth MOID = 1.18891 au 
 Jupiter MOID = 1.21624 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 11.3   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

[ 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 1.33279152041226 1.33279071589345 1.33279232498234 0.604904617692579 n/a 2439526.541854972 1.03774639207929 487.567335910349 21.2453394905714 85.9936722692092 9358512.55932899 F 34 CATAB v2.0f-lin.ifort 2020-Jun-23 15:21:11 2020-Jun-23 15:21
1977-Aug-13 15:15 < 00:01 Jupiter 1.33793207918465 1.33793143334573 1.33793272522757 0.202966362949358 n/a 2443369.135395321 0.799578108634488 1143.23228073809 22.3233899326589 88.8359604377398 8960950.88353275 F 34 CATAB v2.0f-lin.ifort 2020-Jun-23 15:21:11 2020-Jun-23 15:21
2051-May-20 19:46 < 00:01 Jupiter 1.82765225515866 1.82765139953415 1.82765311078409 1.66141454503528 1.35403156825425 2470312.323819997 0.845686976503451 138.343136812358 76.9135735695298 59.8039104175863 1588436.43380188 T 34 CATAB v2.0f-lin.ifort 2020-Jun-23 15:21:11 2020-Jun-23 15:21
2061-Oct-04 13:59 < 00:01 Jupiter 1.22925551871821 1.22925499537282 1.22925604207329 0.688793104807082 n/a 2474102.082815059 0.948701886268595 221.246976460527 16.2143465405027 84.6824287524928 11288469.0589923 F 34 CATAB v2.0f-lin.ifort 2020-Jun-23 15:21:11 2020-Jun-23 15:21
2072-Mar-12 00:24 00:02 Jupiter 1.51472822323847 1.51472685332148 1.51472959315674 0.561465012338192 n/a 2477913.516772377 1.72795555353142 106.955810283939 37.1476913401137 55.1388766174414 5147804.45087421 F 34 CATAB v2.0f-lin.ifort 2020-Jun-23 15:21:11 2020-Jun-23 15:21
2145-Dec-27 20:01 00:03 Jupiter 1.62889650916183 1.62889375372683 1.62889926484868 1.21105266762481 0.653186855804842 2504866.334081187 3.10204320373861 2367.32245846663 431.108906421322 41.3770382589795 1842131.61292771 T 34 CATAB v2.0f-lin.ifort 2020-Jun-23 15:21:11 2020-Jun-23 15:21
2156-Jun-23 12:55 00:03 Jupiter 1.21669396515802 1.21669349666685 1.21669443364955 0.734236652575148 n/a 2508697.037928936 2.761625540728 232.581762493793 23.1189100194684 -89.1681745845055 7869061.91460147 F 34 CATAB v2.0f-lin.ifort 2020-Jun-23 15:21:11 2020-Jun-23 15:21
2166-Oct-06 12:02 00:04 Jupiter 1.71898753553436 1.71898413353546 1.71899093748586 1.50315487493829 1.12870925176127 2512454.001181833 4.27650004152268 1043.7622999237 53.8310418388528 8.68041250007204 516649.992925112 T 34 CATAB v2.0f-lin.ifort 2020-Jun-23 15:21:11 2020-Jun-23 15:21

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jul-06 00:20 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin