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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 2456164.5 (2012-Aug-25.0) TDB
Reference: JPL K183/32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1475978729830388 4.5632e-08  
a 4.166116466787798 5.2952e-08 au
q 3.551206537690306 2.0329e-07 au
i 6.650985958729152 3.9016e-06 deg
node 77.08362628457432 3.5265e-05 deg
peri 86.60992991007603 4.1552e-05 deg
M 130.4256686310993 1.8362e-05 deg
tp 2455039.231638814930
(2009-Jul-26.73163881)
0.0001554 TDB
period 3105.95770202578
8.50
5.9216e-05
1.621e-07
d
yr
n .1159062790086289 2.2098e-09 deg/d
Q 4.78102639588529 6.0768e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.127470340116414E-7 1.72E-8
A2 [EST] -9.860998856757995E-8 1.966E-9
  Orbit Determination Parameters
   # obs. used (total)      5775  
   data-arc span      8814 days (24.13 yr)  
   first obs. used      1997-07-14  
   last obs. used      2021-08-31  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .65875  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2021-Sep-07 11:38:18  

Additional Information
 Earth MOID = 2.56858 au 
 Jupiter MOID = .477964 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 4.8   0.8 K183/32 2 parameter fit from 2256 observations, autocmod 2.9e
comet total magnitude slope K1 17.25   n/a K183/32 autocmod 2.9e
comet nuclear magnitude M2 12.1   0.6 K183/32 from 3124 observations, autocmod 2.9e
comet nuclear magnitude slope K2 5.   n/a K183/32 autocmod 2.9e
comet nuclear phase coefficient PC 0.03   n/a K183/32 autocmod 2.9e
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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