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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 136 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2379232482030033 1.9732e-08  
a 2.615337018438289 3.9624e-09 au
q 1.993087539865894 5.2511e-08 au
i 18.51148254129855 3.5566e-07 deg
node 159.2676881054476 2.226e-06 deg
peri 163.0071393683308 5.343e-06 deg
M 55.41816436947877 3.5437e-06 deg
tp 2458962.684830185792
(2020-Apr-23.18483019)
1.5092e-05 TDB
period 1544.862810004329
4.23
3.5109e-06
9.612e-09
d
yr
n .2330304009318415 5.2959e-10 deg/d
Q 3.237586497010685 4.9052e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3072  
   data-arc span      51853 days (141.97 yr)  
   first obs. used      1879-03-22  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46975  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 10:27:43  

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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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