[Iaude] MPEC T38: COMET C/2017 S7 (Lemmon)

mpec at mpcdb1.cfa.harvard.edu mpec at mpcdb1.cfa.harvard.edu
Sat Oct 7 22:09:17 EDT 2017


M.P.E.C. 2017-T38                                Issued 2017 Oct. 8, 02:01 UT
 
     The Minor Planet Electronic Circulars contain information on unusual
         minor planets and routine data on comets.  They are published
    on behalf of Division F of the International Astronomical Union by the
          Minor Planet Center, Smithsonian Astrophysical Observatory,
                          Cambridge, MA 02138, U.S.A.

             Prepared using the Tamkin Foundation Computer Network

                              MPC at CFA.HARVARD.EDU
            URL http://www.minorplanetcenter.net/    ISSN 1523-6714


                           COMET C/2017 S7 (Lemmon)
 
Observations:
    CK17S070  C2016 12 18.38857 05 33 33.54 +26 00 12.8          19.2 TqET038G96
    CK17S070  C2016 12 18.39288 05 33 33.28 +26 00 11.3          19.2 TqET038G96
    CK17S070  C2016 12 18.39721 05 33 33.07 +26 00 08.0          18.9 TqET038G96
    CK17S070  C2016 12 18.40149 05 33 32.91 +26 00 07.5          19.0 TqET038G96
    CK17S070  C2016 12 27.28622 05 26 11.97 +25 21 29.8          19.4 TqET038G96
    CK17S070  C2016 12 27.29435 05 26 11.55 +25 21 27.1          19.4 TqET038G96
    CK17S070  C2016 12 27.29862 05 26 11.34 +25 21 26.2          19.3 TqET038G96
    CK17S070  C2016 12 27.30302 05 26 11.06 +25 21 24.8          19.3 TqET038G96
    CK17S070  C2016 12 30.21408 05 23 50.59 +25 08 26.8          20.6 TqET038G96
    CK17S070  C2016 12 30.21865 05 23 50.41 +25 08 25.4          20.0 TqET038G96
    CK17S070  C2016 12 30.22218 05 23 50.19 +25 08 24.2          19.8 TqET038G96
    CK17S070  C2016 12 30.22694 05 23 50.03 +25 08 23.3          19.6 TqET038G96
    CK17S070  C2017 09 26.46499 05 25 42.49 +09 42 09.9          19.6 TqET038G96
    CK17S070  C2017 09 26.47107 05 25 42.40 +09 42 07.8          19.7 TqET038G96
    CK17S070  C2017 09 26.47717 05 25 42.31 +09 42 05.8          19.9 TqET038G96
    CK17S070  C2017 09 26.48326 05 25 42.22 +09 42 03.6                qET038G96
    CK17S070 KC2017 09 27.15943005 25 31.84 +09 38 22.0          20.0 TUET038Z17
    CK17S070 KC2017 09 27.16405805 25 31.72 +09 38 20.8          19.8 TUET038Z17
    CK17S070 KC2017 09 27.19723005 25 31.23 +09 38 09.4          19.7 TUET038Z17
    CK17S070 KC2017 09 27.20186705 25 31.16 +09 38 08.2          19.6 TUET038Z17
    CK17S070 KC2017 09 27.20648505 25 31.11 +09 38 06.2          20.0 TUET038Z17
    CK17S070 KC2017 09 29.03986 05 25 01.36 +09 28 01.6          19.7 ToET038K88
    CK17S070 KC2017 09 29.04310 05 25 01.27 +09 28 00.4                oET038K88
    CK17S070 5C2017 09 29.51869 05 24 53.31 +09 25 22.1                vET038U69
    CK17S070 5C2017 09 29.52113 05 24 53.27 +09 25 21.0                vET038U69
    CK17S070 5C2017 09 29.52357 05 24 53.24 +09 25 20.0          20.1 TvET038U69
    CK17S070 KC2017 09 30.12364 05 24 42.84 +09 22 02.1          19.3 ToET038K88
    CK17S070 KC2017 09 30.13335 05 24 42.68 +09 21 58.4          19.3 ToET038K88
    CK17S070  C2017 09 30.34012 05 24 39.12 +09 20 49.6                qET038I52
    CK17S070  C2017 09 30.35690 05 24 38.85 +09 20 43.6          20.9 TqET038I52
    CK17S070  C2017 09 30.36502 05 24 38.66 +09 20 40.9                qET038I52
    CK17S070 KC2017 10 01.04916 05 24 26.54 +09 16 52.5          20.3 TqET038A71
    CK17S070 KC2017 10 01.06657 05 24 26.21 +09 16 46.9          20.0 TqET038A71
    CK17S070 KC2017 10 01.08709 05 24 25.81 +09 16 40.0                uET038118
    CK17S070 KC2017 10 01.10295 05 24 25.49 +09 16 34.8                uET038118
    CK17S070  C2017 10 01.42088 05 24 19.78 +09 14 48.8          19.2 TqET038G96
    CK17S070  C2017 10 01.43298 05 24 19.59 +09 14 46.0          19.0 TqET038G96
    CK17S070  C2017 10 01.44533 05 24 19.37 +09 14 40.6          19.5 TqET038G96
    CK17S070  C2017 10 01.45675 05 24 19.16 +09 14 36.2                qET038G96
    CK17S070 #C2017 10 02.12886 05 24 06.77 +09 10 51.8                qET038G40
    CK17S070 #C2017 10 02.15170 05 24 06.33 +09 10 43.4          20.0 TqET038G40
    CK17S070  C2017 10 02.33550 05 24 02.92 +09 09 41.7          20.0 TqET038G96
    CK17S070  C2017 10 02.34654 05 24 02.76 +09 09 38.1          20.0 TqET038G96
    CK17S070  C2017 10 02.35745 05 24 02.55 +09 09 34.6          19.6 TqET038G96
    CK17S070 HC2017 10 02.36780 05 24 02.31 +09 09 31.3          20.2 ToET038691
    CK17S070  C2017 10 02.36836 05 24 02.31 +09 09 30.9          20.0 TqET038G96
    CK17S070 HC2017 10 02.37999 05 24 02.09 +09 09 27.0          20.2 ToET038691
    CK17S070 HC2017 10 02.39220 05 24 01.87 +09 09 22.6          19.6 ToET038691
    CK17S070 9C2017 10 03.17257 05 23 47.01 +09 04 59.9                UET038G40
    CK17S070 9C2017 10 03.18437 05 23 46.77 +09 04 56.2          19.8 TUET038G40
    CK17S070 KC2017 10 04.41380 05 23 22.62 +08 58 00.6          20.0 TqET038850
    CK17S070 KC2017 10 04.42113 05 23 22.46 +08 57 57.9          20.1 TqET038850
    CK17S070 KC2017 10 04.42853 05 23 22.31 +08 57 55.0          20.0 TqET038850
    CK17S070  C2017 10 06.38790 05 22 42.02 +08 46 49.0          18.7 ToET038926
    CK17S070  C2017 10 06.40833 05 22 41.61 +08 46 42.2          18.1 ToET038926
    CK17S070  C2017 10 06.42913 05 22 41.16 +08 46 35.0          19.3 ToET038926
    CK17S070  C2017 10 07.40293305 22 20.25 +08 41 00.9          19.5 TUET038H01
    CK17S070  C2017 10 07.40939505 22 20.11 +08 40 58.9          19.8 TUET038H01
    CK17S070  C2017 10 07.41801005 22 19.91 +08 40 56.1          19.5 TUET038H01
    CK17S070  C2017 10 07.42343605 22 19.79 +08 40 54.2          19.9 TUET038H01
    CK17S070  C2017 10 07.43928 05 22 19.38 +08 40 49.0          20.2 ToET038926
    CK17S070  C2017 10 07.45791 05 22 19.00 +08 40 42.6          19.8 ToET038926
    CK17S070  C2017 10 07.47218 05 22 18.69 +08 40 38.0          20.7 ToET038926
 
Observer details:
118 Modra.  Observer S. Gajdos.  0.6-m f/5.5 reflector + CCD.
691 Steward Observatory, Kitt Peak.  Observer T. H. Bressi.  0.9-m f/3
    reflector + CCD.
850 Cordell-Lorenz Observatory, Sewanee.  Observer D. T. Durig.  0.3-m f/7.6
    Schmidt-Cassegrain + CCD.
926 Tenagra II Observatory.  Observers M. Schwartz, P. R. Holvorcem.  Measurer
    M. Schwartz.  0.81-m f/7 Ritchey-Chretien + CCD.
A71 Stixendorf.  Observers M. Jaeger, E. Prosperi, S. Prosperi, W. Vollmann.
    Measurer M. Jaeger.  0.3-m f/4 reflector + CCD.
G40 Slooh.com Canary Islands Observatory.  Observers J. L. Tuten,
    K. D. Breedlove, B. Lutkenhoner.  Measurers J. L. Tuten, B. Lutkenhoner.
    0.43-m f/6.8 Corrected Dall-Kirkham + CCD, 0.5-m f/6.8 reflector + CCD.
G96 Mt. Lemmon Survey.  Observers G. J. Leonard, R. G. Matheny, D. C. Fuls.
    Measurers E. J. Christensen, D. C. Fuls, A. R. Gibbs, A. D. Grauer,
    J. A. Johnson, R. A. Kowalski, S. M. Larson, G. J. Leonard, R. G. Matheny,
    R. L. Seaman, F. C. Shelly.  1.5-m reflector + 10K CCD.
H01 Magdalena Ridge Observatory, Socorro.  Observers W. H. Ryan, E. V. Ryan.
    Measurer W. H. Ryan.  2.4-m f/8.9 reflector + CCD.
I52 Steward Observatory, Mt. Lemmon Station.  Observer R. A. Kowalski.
    Measurers E. J. Christensen, D. C. Fuls, A. R. Gibbs, A. D. Grauer,
    J. A. Johnson, R. A. Kowalski, S. M. Larson, G. J. Leonard, R. G. Matheny,
    R. L. Seaman, F. C. Shelly.  1.0-m reflector + CCD.
K88 GINOP-KHK, Piszkesteto.  Observers O. Hanyecz, K. Sarneczky.  Measurer
    K. Sarneczky.  0.60-m Schmidt + CCD.
U69 iTelescope SRO Observatory, Auberry.  Observer H. Sato.  0.61-m f/6.5
    astrograph + CCD.
Z17 Tenerife-LCO Aqawan A #2.  Observers T. Lister, S. Greenstreet, E. Gomez.
    Measurer T. Lister.  0.4-m f/8 Schmidt-Cassegrain + CCD.
 
Orbital elements:
    C/2017 S7 (Lemmon)
Epoch 2017 June 16.0 TT = JDT 2457920.5
T 2017 May 27.92836 TT                                  MPCW
q   7.6141487            (2000.0)            P               Q
z  -0.0002752      Peri.  187.74976     +0.19964863     +0.53590613
 +/-0.0000199      Node   262.78691     +0.93752419     +0.13897361
e   1.0020955      Incl.  124.22083     +0.28493653     -0.83276104
>From 63 observations 2016 Dec. 18-2017 Oct. 7, mean residual 0".4.

    C/2017 S7 (Lemmon)
Epoch 2017 Sept. 4.0 TT = JDT 2458000.5
T 2017 May 27.86080 TT                                  MPCW
q   7.6141284            (2000.0)            P               Q
z  -0.0002862      Peri.  187.74552     +0.19960355     +0.53595643
 +/-0.0000199      Node   262.78749     +0.93751400     +0.13903503
e   1.0021791      Incl.  124.22319     +0.28500162     -0.83271842
>From 63 observations 2016 Dec. 18-2017 Oct. 7, mean residual 0".4.

Ephemeris:
    C/2017 S7 (Lemmon)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2017 09 08    05 28 42.7 +11 18 05   7.6932  7.6412    83.3     7.5  20.3
...
2017 09 23    05 26 31.5 +10 00 56   7.4424  7.6497    98.2     7.5  20.2
...
2017 10 01    05 24 27.4 +09 17 10   7.3131  7.6547   106.3     7.2  20.2
...
2017 10 07    05 22 28.9 +08 43 20   7.2206  7.6586   112.5     6.9  20.1
2017 10 08    05 22 07.1 +08 37 38   7.2056  7.6593   113.5     6.9  20.1
2017 10 09    05 21 44.6 +08 31 54   7.1908  7.6599   114.6     6.8  20.1
...
2017 10 15    05 19 17.4 +07 57 09   7.1055  7.6641   120.8     6.4  20.1
...
2017 10 23    05 15 28.3 +07 10 07   7.0028  7.6700   129.2     5.8  20.1
...
2017 11 07    05 06 48.6 +05 41 36   6.8536  7.6818   144.5     4.3  20.0

Gareth V. Williams           (C) Copyright 2017 MPC           M.P.E.C. 2017-T38




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