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168 Sibylla
Classification: Outer Main-belt Asteroid          SPK-ID: 2000168
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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 2-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 has stopped working because of a recent Java upgrade, here is a possible workaround.
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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06872041303814422 6.1302e-08  
a 3.374290978079453 1.6129e-08 AU
q 3.14240830835495 2.1259e-07 AU
i 4.635856582111693 6.8117e-06 deg
node 206.4176392095089 7.2249e-05 deg
peri 169.8229395806941 8.4799e-05 deg
M 48.62978341709114 4.4239e-05 deg
tp 2456494.675652659779
(2013-Jul-21.17565266)
0.00027788 JED
period 2263.978107782102
6.20
1.6232e-05
4.444e-08
d
yr
n .1590121383075885 1.1401e-09 deg/d
Q 3.606173647803957 1.7237e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1427  
   data-arc span      48879 days (133.82 yr)  
   first obs. used      1880-04-13  
   last obs. used      2014-02-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .62788  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Mar-22 10:32:55  

Additional Information
 Earth MOID = 2.14243 AU 
 T_jup = 3.144 
[ hide covariance matrix ]
Orbital Elements at Epoch 2453277.5 (2004-Sep-29.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06653733335270474 6.0975e-08
q 3.151910829097925 2.1105e-07 AU
tp 2454217.540158960417
(2007-Apr-27.04015896)
0.00028659 JED
node 206.463721074537 7.226e-05 deg
peri 168.0005072665437 8.5728e-05 deg
i 4.633433758993849 6.8107e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1427  
   data-arc span      48879 days (133.82 yr)  
   first obs. used      1880-04-13  
   last obs. used      2014-02-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .62788  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Mar-22 10:32:55  

Additional Information
 T_jup = 3.144 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.718005622535261E-15 -1.28389631084519E-14 1.744451981380358E-12 1.077696459186367E-14 1.922365676676648E-13 1.843690518042345E-15
q -1.28389631084519E-14 4.454319811038568E-14 -5.513306682325217E-12 1.396967284243554E-16 -6.299339934738113E-13 -3.877913664394535E-15
tp 1.744451981380358E-12 -5.513306682325217E-12 8.213564761123808E-8 1.015523129875523E-10 1.323284677006797E-8 -1.293630368382731E-12
node 1.077696459186367E-14 1.396967284243554E-16 1.015523129875523E-10 5.221572271403343E-9 -5.191255719086789E-9 2.774035097853742E-11
peri 1.922365676676648E-13 -6.299339934738113E-13 1.323284677006797E-8 -5.191255719086789E-9 7.349373067267432E-9 -2.793376628759114E-11
i 1.843690518042345E-15 -3.877913664394535E-15 -1.293630368382731E-12 2.774035097853742E-11 -2.793376628759114E-11 4.638629179217305E-11

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.94 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6
diameter diameter 148.39 km 4.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6
rotation period rot_per 47.009 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Pilcher, F.; Benishek, V.; Brinsfield, J.W. (2008) Minor Planet Bul. 35, 104-105.]
geometric albedo albedo 0.0535   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6
B-V BV .745 mag .013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=5; phase (min.=1.40, mean=7.89, max.=17.63) deg.
U-B UB .384 mag .027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=5; phase (min.=1.68, mean=11.14, max.=17.66) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Ch   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)

168 Sibylla          Discovered 1876-Sep-28 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1949 MO = A911 HF 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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