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Observation date

image

Photometry

(FOCAS)

Afρ

astrometry

Observatory

20211011

X



X

X02 - Telescope.Live

20221125

X

X

X

X

B96 - BRIXIIS

20221212

X

X

X

X

B96 - BRIXIIS

20240503

X



X

B96 - BRIXIIS

20240513

X



X

B96 - BRIXIIS



















COMET C/2021 T4 (LEMMON)

Photometric data obtained from FOCAS-II software



CATALOG: Gaia DR2 - BAND: G


                                   10x10  20x20  30x30  40x40  50x50  60x60   SNR   SB   COD

COMET         UTC                    +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

------------  -------------------  -----  -----  -----  -----  -----  -----  ----  ----  ---

C/2021 T4     25/11/2022 21:14:49  16.20  15.64  15.41  15.22  15.14  15.05  13.0  17.4  B96

C/2021 T4     25/11/2022 21:14:49*  0.08   0.12   0.14   0.15   0.13   0.10     2   3.7  Gai

C/2021 T4     12/12/2022 18:41:38  16.17  15.61  15.37  15.24  15.15  15.04  10.4  17.1  B96

C/2021 T4     12/12/2022 18:41:38*  0.00   0.00   0.00   0.00   0.00   0.00     1   3.9  Gai


                                                                     AFRHO         LOG

COMET         UTC                   DELTA    r    BOX "   MAG   RSR    CM    +/-  AFRHO  OBS

------------  -------------------   -----  -----  -----  -----  ---  -----  ----  -----  ---

C/2021 T4     25/11/2022 21:14:49    2.75   3.46  10.02  16.14   13    304    23  2.483  B96

C/2021 T4     12/12/2022 18:41:38    2.87   3.29   9.61  16.13   10    303    29  2.481  B96




Af(rho) data according the CARA-approach is available via request to CARA-coordinator


http://cara.uai.it

Comet C/2021 T4 (LEMMON) (astro.vanbuitenen.nl)


Discovery:  [ CBET 5063 ]


     E. Bryssinck reports cometary activity of an asteroidal NEOCP candidate (submitted by Mount Lemmon Survey on Oct. 7 UT) in twelve 120-second images taken on Oct. 11 at Telescope Live (X02), noting a condensed 9" coma elongated in position angle 321 deg. Prediscovery astrometry was reported back to Aug.  2021. Additional reports of cometary features are as follows:


OC   Date        Reporter           Coma    Tail    PA          Exposures


204  2021-10-15  L. Buzzi           4".8

157  2021-10-16  R. Haver           6"                           40x90s

F51  2021-10-27  R. Weryk           0".6     2"    70-115         2x45s

246  2021-10-28  M. Tichy           8".0


MPEC 2021-U187 : COMET C/2021 T4 (Lemmon)