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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 
[ 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 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

[ 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
1984-May-25 04:36 < 00:01 Thisb 0.0444558582708002 0.0444554474457913 0.0444562691034928 5.61683821584269 5.61683818853696 2445845.691806296 0.3446643841194 45.2773141930817 14.1799207904743 69.8987920039147 443191.534048058 T 134 CATAB v2.0f-lin.ifort 2021-Feb-24 00:44:27 2021-Feb-24 00:44
2137-Jan-10 02:21 < 00:01 Psych 0.0105929737102808 0.0105903316979459 0.0105956160640425 5.10882903741376 5.10882881384356 2501592.597817029 0.300188157863136 163.277727112092 24.9690024333221 36.7457965956103 38731.7034404836 T 134 CATAB v2.0f-lin.ifort 2021-Feb-24 00:44:27 2021-Feb-24 00:44
2140-Dec-25 14:23 < 00:01 Thisb 0.0240997281508805 0.0240992768261372 0.0241001797005295 5.58848356472206 5.58848351409664 2503038.099237811 0.350797292245859 164.664360696576 15.813682470005 84.3934321474286 226832.354051067 T 134 CATAB v2.0f-lin.ifort 2021-Feb-24 00:44:27 2021-Feb-24 00:44
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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