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12161 Avienius (1158 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2012161
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .206623875835058 3.756e-08  
a 2.397861075961225 7.6516e-09 au
q 1.902405726732094 8.9437e-08 au
i 1.694144135961518 4.5355e-06 deg
node 223.8313524704334 0.00011674 deg
peri 188.8172674543432 0.00011711 deg
M 168.4778580545233 9.4402e-06 deg
tp 2458365.790811583974
3.4276e-05 TDB
period 1356.23345683694
n .2654410257947816 1.2705e-09 deg/d
Q 2.893316425190355 9.2326e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1026  
   data-arc span      17022 days (46.60 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5118  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 03:40:59  

Additional Information
 Earth MOID = .913489 au 
 Jupiter MOID = 2.47394 au 
 T_jup = 3.498 
[ 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 15.8   n/a MPO452342  
rotation period rot_per 3.13 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]

12161 Avienius           Discovered 1973 Sept. 29 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Postumius Rufius Festus Avienius, who lived in the second half of the fourth century, was a Latin poet from Etruria. He composed didactic poems on astronomy and geography. His Aratea was based on earlier Latin translations of Aratus' Phaenomena. The name was suggested by R. H. van Gent.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100527/MPCPages.arcLast Updated: 2010-12-06

[ show close-approach data ]
Alternate Designations
 1158 T-2 = 1977 XZ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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