[Iaude] MPEC X223: COMET C/2023 T4 (Lemmon)

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Mon Dec 11 19:39:13 EST 2023


M.P.E.C. 2023-X223                            Issued 2023 December 12, 00:35 UT

     The Minor Planet Electronic Circulars contain information on unusual
         minor planets, routine data on comets and natural satellites,
         and occasional editorial announcements.  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 https://www.minorplanetcenter.net/    ISSN 1523-6714

                            COMET C/2023 T4 (Lemmon)                            

     R. Weryk reports the discovery of a comet in four 45-second w-band survey
images taken on Dec. 4 UT by Pan-STARRS 1 (F51), noting a condensed 0".7 coma
and a straight 6" tail at position angle 210 deg. Prediscovery positions were
reported back to Aug. 2023 UT. Additional reports of cometary features are as
follows:

OC   Date        Reporter           Coma    Tail    PA          Exposures

F52  2023-12-07  Y. Ramanjooloo     2".1      2".2  227           4x45s
204  2023-12-07  L. Buzzi           7"       12"    265          99x30s

Observations:
    CK23T040  C2023 08 18.60582304 43 22.868+12 35 12.29         21.79GVEX223F52
    CK23T040  C2023 08 18.61097204 43 22.937+12 35 13.14         22.09GVEX223F52
    CK23T040  C2023 08 18.61608604 43 22.991+12 35 13.56         21.69GVEX223F52
    CK23T040  C2023 08 18.62120304 43 23.043+12 35 14.40         21.97GVEX223F52
    CK23T040  C2023 09 20.55756904 44 41.892+13 36 34.55         21.77GVEX223F52
    CK23T040  C2023 09 20.56972404 44 41.809+13 36 35.84         21.35GVEX223F52
    CK23T040  C2023 09 20.58192104 44 41.734+13 36 37.03         21.52GVEX223F52
    CK23T040  C2023 10 07.49368404 41 35.363+14 06 48.92         21.06GVEX223F52
    CK23T040  C2023 10 07.50541804 41 35.149+14 06 50.35         21.44GVEX223F52
    CK23T040  C2023 10 07.51704204 41 34.996+14 06 51.57         21.30GVEX223F52
    CK23T040  C2023 10 07.52866904 41 34.811+14 06 52.90         21.54GVEX223F52
    CK23T040  C2023 10 12.47050504 40 09.081+14 15 48.74         21.48wXEX223F51
    CK23T040  C2023 10 12.48463104 40 08.803+14 15 50.25         21.61wXEX223F51
    CK23T040  C2023 10 12.49638504 40 08.575+14 15 51.79         21.32wXEX223F51
    CK23T040  C2023 10 12.50809404 40 08.348+14 15 52.56         21.59wXEX223F51
    CK23T040  C2023 10 17.46998004 38 28.173+14 24 57.03         21.53wXEX223F52
    CK23T040  C2023 10 17.48108404 38 27.905+14 24 58.24         21.60wXEX223F52
    CK23T040  C2023 10 17.49217504 38 27.684+14 24 59.50         21.70wXEX223F52
    CK23T040  C2023 10 17.50321404 38 27.462+14 25 00.89         21.82wXEX223F52
    CK23T040 1C2023 11 04.44621904 30 37.184+14 59 06.29         20.44GVEX223G96
    CK23T040 1C2023 11 04.45142204 30 37.033+14 59 06.68         20.31GVEX223G96
    CK23T040 1C2023 11 04.45663004 30 36.886+14 59 07.15         20.62GVEX223G96
    CK23T040 1C2023 11 04.46183004 30 36.731+14 59 07.98         20.37GVEX223G96
    CK23T040  C2023 11 16.39019904 24 07.580+15 23 14.91         20.78wXEX223F52
    CK23T040  C2023 11 16.40332404 24 07.130+15 23 16.71         20.75wXEX223F52
    CK23T040  C2023 11 16.41628904 24 06.654+15 23 18.11         20.75wXEX223F52
    CK23T040  C2023 12 04.31664504 13 21.529+16 02 18.39         20.51wXEX223F51
    CK23T040  C2023 12 04.33254704 13 20.947+16 02 20.61         20.88wXEX223F51
    CK23T040  C2023 12 04.34673104 13 20.410+16 02 22.51         20.63wXEX223F51
    CK23T040*1C2023 12 04.35197304 13 20.172+16 02 22.60         19.74GVEX223G96
    CK23T040 1C2023 12 04.35709804 13 19.978+16 02 23.24         20.24GVEX223G96
    CK23T040  C2023 12 04.36088104 13 19.894+16 02 24.28         20.59wXEX223F51
    CK23T040 1C2023 12 04.36221504 13 19.780+16 02 24.14         20.11GVEX223G96
    CK23T040 1C2023 12 04.36733304 13 19.603+16 02 24.47         19.88GVEX223G96
    CK23T040 4B2023 12 05.05930604 12 54.276+16 04 01.42         19.8 GVEX223X06
    CK23T040 4B2023 12 05.07861104 12 53.645+16 04 03.72         19.9 GVEX223X06
    CK23T040 0C2023 12 06.16035 04 12 13.96 +16 06 31.8                VEX223U94
    CK23T040 0C2023 12 06.16813 04 12 13.67 +16 06 32.4          20.2 GVEX223U94
    CK23T040 KC2023 12 06.74708704 11 52.40 +16 07 53.1          19.9 GVEX223587
    CK23T040 KC2023 12 06.75233404 11 52.23 +16 07 53.5          20.1 GVEX223587
    CK23T040 KC2023 12 06.75758104 11 52.06 +16 07 54.2          19.9 GVEX223587
    CK23T040 KC2023 12 06.81843 04 11 49.87 +16 08 03.3          20.5 GVEX223204
    CK23T040 KC2023 12 06.84939 04 11 48.71 +16 08 06.4                VEX223204
    CK23T040 KC2023 12 06.87963 04 11 47.58 +16 08 11.5                VEX223204
    CK23T040 KC2023 12 07.00317 04 11 42.99 +16 08 28.7          20.5 GVEX223204
    CK23T040 KC2023 12 07.02101 04 11 42.31 +16 08 31.0                VEX223204
    CK23T040  C2023 12 07.33053504 11 31.086+16 09 15.02         20.61wXEX223F52
    CK23T040  C2023 12 07.34287604 11 30.625+16 09 16.60         20.53wXEX223F52
    CK23T040  C2023 12 07.35516304 11 30.164+16 09 18.49         20.60wXEX223F52
    CK23T040  C2023 12 07.36749704 11 29.719+16 09 20.19         20.56wXEX223F52
    CK23T040 KB2023 12 07.79322 04 11 14.19 +16 10 19.0          19.9 GXEX223G00
    CK23T040 KC2023 12 07.79469 04 11 14.18 +16 10 19.0          20.2 GVEX223G00
    CK23T040 KB2023 12 07.80055 04 11 13.97 +16 10 19.9          19.4 GXEX223G00
    CK23T040 KC2023 12 07.80055 04 11 13.96 +16 10 20.0          20.1 GVEX223G00
    CK23T040 KC2023 12 07.80641 04 11 13.71 +16 10 20.2          19.9 GVEX223G00
    CK23T040 KB2023 12 07.80787 04 11 13.67 +16 10 21.1          19.5 GXEX223G00
    CK23T040 KC2023 12 07.92904 04 11 09.19 +16 10 38.6          19.8 GVEX223104
    CK23T040 KC2023 12 07.94477 04 11 08.66 +16 10 39.4          20.1 GVEX223104
    CK23T040 KC2023 12 08.00491404 11 06.38 +16 10 48.5          20.5 GVEX223L01
    CK23T040 KC2023 12 08.01699904 11 05.92 +16 10 50.0          21.0 GVEX223L01
    CK23T040 KC2023 12 08.01952604 11 05.86 +16 10 51.2          20.8 GVEX223L01
    CK23T040 1C2023 12 08.27181704 10 56.684+16 11 26.10               LEX223658
    CK23T040 1C2023 12 08.27628504 10 56.526+16 11 26.76               LEX223658
    CK23T040 1C2023 12 08.28075204 10 56.360+16 11 27.37               LEX223658
    CK23T040 1C2023 12 08.28520804 10 56.198+16 11 27.81               LEX223658
    CK23T040 1C2023 12 08.28967604 10 56.040+16 11 28.47               LEX223658
    CK23T040 KC2023 12 08.79429 04 10 37.68 +16 12 38.6          19.5 VZEX223M63
    CK23T040 KC2023 12 08.80638 04 10 37.23 +16 12 40.6          20.1 VZEX223M63
    CK23T040 KC2023 12 08.81807 04 10 36.84 +16 12 43.0          20.6 VZEX223M63
    CK23T040 KC2023 12 09.05892604 10 28.04 +16 13 16.4          20.1 GXEX223W62
    CK23T040 KC2023 12 09.07296104 10 27.52 +16 13 18.3          19.9 GXEX223W62
    CK23T040 KC2023 12 09.08699504 10 27.01 +16 13 20.4          19.9 GXEX223W62
    CK23T040 KC2023 12 11.19060 04 09 10.62 +16 18 20.2          19.7 GVEX223X03
    CK23T040 KC2023 12 11.20396 04 09 10.14 +16 18 21.2          19.8 GVEX223X03
    CK23T040 KC2023 12 11.21622 04 09 09.70 +16 18 23.1          19.7 GVEX223X03

Observer details:
104 San Marcello Pistoiese.  Observers P. Bacci, M. Maestripieri.  Measurer P.
    Bacci.  0.60-m f/4.0 reflector + CCD.
204 Schiaparelli Observatory.  Observers A. Aletti, L. Buzzi, G. Galli.
    Measurers A. Aletti, M. Auteri, L. Buzzi, G. Galli.  0.36-m f/7.5
    reflector + CCD, 0.84-m f/3.5 reflector + CCD.
587 Sormano.  Observers E. Colzani, G. Ventre.  Measurer P. Sicoli.  0.5-m
    f/6.8 reflector + CCD.
658 National Research Council of Canada.  Observers D. D. Balam, C. E. Spratt.
    Measurers D. D. Balam, D. W. E. Green.  1.82-m Reflector + CCD.
F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, T. Lowe, P. Minguez, A.
    Schultz, I. Smith, J. Herman.  Measurers K. Chambers, T. de Boer, J.
    Fairlamb, H. Gao, M. Huber, C.-C. Lin, E. Magnier, Y. Ramanjooloo, R.
    Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.
F52 Pan-STARRS 2, Haleakala.  Observers J. Herman, T. Lowe, P. Minguez, A.
    Schultz, I. Smith, J. Bulger.  Measurers K. Chambers, T. de Boer, J.
    Fairlamb, H. Gao, M. Huber, C.-C. Lin, E. Magnier, Y. Ramanjooloo, R.
    Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.
G00 AZM Martinsberg, Oed.  Observers M. Jaeger, E. Prosperi, S. Prosperi.
    Measurer M. Jaeger.  0.30-m f/4.0 reflector + CMO, 0.3-m f/4.0 reflector +
    CCD.
G96 Mt. Lemmon Survey.  Observers J. B. Fazekas, J. K. Hogan.  Measurers E. C.
    Beshore, D. Fay, J. B. Fazekas, D. C. Fuls, A. R. Gibbs, A. D. Grauer, H.
    Groeller, J. K. Hogan, R. A. Kowalski, S. M. Larson, G. J. Leonard, D.
    Rankin, R. L. Seaman, F. C. Shelly, K. W. Wierzchos.  1.5-m reflector +
    10K CCD.
L01 Visnjan Observatory, Tican.  Observer K. Korlevic.  1.0-m f/2.9 reflector
    + CCD.
M63 RPF Observatory, Gagliano del Capo.  Observer D. Licchelli.  0.30-m f/5.3
    reflector + CCD.
U94 iTelescope Observatory, Beryl Junction.  Observer H. Sato.  0.43-m f/6.8
    astrograph + CCD.
W62 Comet Hunter Observatory2, New Ringgold.  Observer J. Maikner.  0.30-m
    f/3.8 Riccardi-Honders + CCD.
X03 Observatoire SADR, Poroto.  Observers J. L. Virlichie, P. Traverse, H.
    Roy.  Measurer J. L. Virlichie.  0.36-m f/4.8 reflector + CCD.
X06 Skygems Chile, Rio Hurtado.  Observer J. Camarasa.  0.40-m f/6.6 reflector
    + CMO.

Orbital elements:
    C/2023 T4 (Lemmon)                                                          
Epoch 2023 Sept. 13.0 TT = JDT 2460200.5                                        
T 2025 Dec. 26.29303 TT                                 Bell                    
q   5.1048631            (2000.0)            P               Q                  
z  +0.0000088      Peri.   64.41124     -0.01269381     -0.45151571             
 +/-0.0000699      Node    66.31255     +0.08830966     -0.88926448             
e   0.9999551      Incl.   76.97025     +0.99601218     +0.07309066             
>From 75 observations 2023 Aug. 18-Dec. 11, mean residual 0".3.                  
                                                                                
Ephemeris:
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   m1    m2
2023 11 12    04 26 36.4 +15 14 13   6.6812  7.6221   160.6     2.5  19.9
...
2023 11 27    04 17 49.6 +15 45 55   6.5636  7.5463   174.4     0.7  19.9
...
2023 12 05    04 12 56.5 +16 03 52   6.5320  7.5061   170.6     1.2  19.8
...
2023 12 11    04 09 17.6 +16 17 52   6.5227  7.4760   164.4     2.0  19.8
2023 12 12    04 08 41.5 +16 20 15   6.5223  7.4709   163.3     2.2  19.8
2023 12 13    04 08 05.5 +16 22 38   6.5222  7.4659   162.2     2.3  19.8
...
2023 12 19    04 04 34.1 +16 37 19   6.5288  7.4359   155.6     3.1  19.8
...
2023 12 27    04 00 07.8 +16 57 45   6.5550  7.3960   146.6     4.2  19.8
...
2024 01 11    03 52 58.5 +17 39 02   6.6515  7.3215   129.9     5.9  19.8

M. P. C. Staff               (C) Copyright 2023 MPC           M.P.E.C. 2023-X223




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