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74P/Smirnova-Chernykh
Classification: Encke-type Comet          SPK-ID: 1000088
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2456138.5 (2012-Jul-30.0) TDB
Reference: JPL K183/28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1475582361428681 4.6233e-08  
a 4.166325397343524 5.3523e-08 au
q 3.551549770514279 2.0669e-07 au
i 6.650944799327097 3.9205e-06 deg
node 77.08324032781579 3.5429e-05 deg
peri 86.62521496227784 4.2191e-05 deg
M 127.3972688097055 1.904e-05 deg
tp 2455039.276959879556
(2009-Jul-26.77695988)
0.00016072 TDB
period 3106.19135041624
8.50
5.9856e-05
1.639e-07
d
yr
n .1158975605130569 2.2333e-09 deg/d
Q 4.781101024172768 6.1421e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.192646722327512E-7 1.825E-8
A2 [EST] -9.832706248796792E-8 1.983E-9
  Orbit Determination Parameters
   # obs. used (total)      5717  
   data-arc span      8683 days (23.77 yr)  
   first obs. used      1997-07-14  
   last obs. used      2021-04-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .66031  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2021-May-05 00:25:37  

Additional Information
 Earth MOID = 2.56988 au 
 Jupiter MOID = .477756 au 
 T_jup = 3.007 
[ 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
comet total magnitude M1 5.0   0.8 K183/28 2 parameter fit from 2197 observations, autocmod 2.9c
comet total magnitude slope K1 16.75   n/a K183/28 autocmod 2.9c
comet nuclear magnitude M2 12.1   0.6 K183/28 from 3124 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a K183/28 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a K183/28 autocmod 2.9c
diameter diameter 4.46 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  

74P/Smirnova-Chernykh          Discovered 1975-Mar-(late) by Smirnova, Tamara Mikhajlovna at Crimean Astrophysical Observatory
discovered on plate/photo taken on 3/4,16
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1992.6       1992 XXI   
 1984.1       1984 V   
 1975.6   74P/1975 E2   1975 VII   1975e 
 1967.0   74P/1967 EU   1967 XV   
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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