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194 Prokne (A879 FA)
Classification: Main-belt Asteroid          SPK-ID: 2000194
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 134 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .237923218748599 2.7858e-08  
a 2.615337014523506 4.7376e-09 au
q 1.993087613915722 7.2436e-08 au
i 18.51148347321427 3.4119e-06 deg
node 159.2676889326851 1.0381e-05 deg
peri 163.0071440840811 1.2716e-05 deg
M 55.41816143722404 8.6568e-06 deg
tp 2458962.684843302897
(2020-Apr-23.18484330)
3.6864e-05 TDB
period 1544.862806535672
4.23
4.1977e-06
1.149e-08
d
yr
n .233030401455061 6.3319e-10 deg/d
Q 3.237586415131289 5.8648e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2959  
   data-arc span      51802 days (141.83 yr)  
   first obs. used      1879-03-22  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47691  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:44:18  

Additional Information
 Earth MOID = .985908 au 
 Jupiter MOID = 2.17206 au 
 T_jup = 3.296 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454653.5 (2008-Jul-06.0) TDB
Reference: JPL 134 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2357669904533208 2.7801e-08  
q 2.000510121164348 7.2157e-08 au
tp 2454324.681352492097
(2007-Aug-12.18135249)
3.4347e-05 TDB
node 159.4798247571211 1.0391e-05 deg
peri 162.9251275517174 1.2796e-05 deg
i 18.48506331054292 3.4112e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2959  
   data-arc span      51802 days (141.83 yr)  
   first obs. used      1879-03-22  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47691  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:44:18  

Additional Information
 Jupiter MOID = 2.17206 au 
 T_jup = 3.296 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.729144008999989E-16 -2.003501796850717E-15 1.379790471351263E-13 -6.322788029271058E-16 5.023926325993926E-14 1.741122498946831E-15
q -2.003501796850717E-15 5.206633336932165E-15 -3.527573665182069E-13 1.724855645380622E-15 -1.290020410348133E-13 -4.399288050949023E-15
tp 1.379790471351263E-13 -3.527573665182069E-13 1.179725625667156E-9 -6.247588029453648E-12 2.69363420043146E-10 1.97204522921744E-12
node -6.322788029271058E-16 1.724855645380622E-15 -6.247588029453648E-12 1.079669170532736E-10 -1.033731578434607E-10 9.350720319381466E-12
peri 5.023926325993926E-14 -1.290020410348133E-13 2.69363420043146E-10 -1.033731578434607E-10 1.637316943613426E-10 -8.36370464993438E-12
i 1.741122498946831E-15 -4.399288050949023E-15 1.97204522921744E-12 9.350720319381466E-12 -8.36370464993438E-12 1.163611565312586E-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 7.83   n/a E2021B10 IRAS observations used: 9
diameter diameter 161.667 km 1.252 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 15.679 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Scaltriti, F.; Zappala, V. (1979) Icarus 39, 124-130.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2010) Minor Planet Bull. 37, 119-122.]
[Pilcher, F. (2011) Minor Planet Bull. 38, 183-185.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2019) Minor Planet Bull. 46, 445-448.]
geometric albedo albedo 0.057   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.724   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=10.24, mean=17.56, max.=25.12) deg.
U-B UB 0.341   0.011 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=10.24, mean=15.04, max.=17.62) 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 C   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)

194 Prokne (A879 FA)          Discovered 1879-Mar-21 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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