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Observation date

image

Photometry

(FOCAS)

Afρ

astrometry

Observatory

20230517

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X


X

B96 - BRIXIIS

20230604

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X


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B96 - BRIXIIS

20240619

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B96 - BRIXIIS





































Comet C/2019 T4 (ATLAS)

Photometric data obtained from FOCAS-II software


COD B96

OBS BRIXIIS Observatory, Kruibeke, Belgium

CATALOG: Gaia DR2 - BAND: G


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

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

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

C/2019 T4     17/05/2023 20:56:50  15.01  14.28  13.87  13.57  13.38  13.27  21.0  17.3  B96

C/2019 T4     17/05/2023 20:56:50*  0.02   0.06   0.06   0.04   0.02   0.02     3   3.3  Gai

C/2019 T4     04/06/2023 22:46:13  15.16  14.37  13.96  13.70  13.51  13.39  28.4  17.4  B96

C/2019 T4     04/06/2023 22:46:13*  0.00   0.01   0.01   0.01   0.01   0.02     2   3.6  Gai





                                                                     AFRHO         LOG

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

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

C/2019 T4     17/05/2023 20:56:50    4.27   5.09   6.46  15.41   21   3099   148  3.491  B96

C/2019 T4     04/06/2023 22:46:13    4.45   5.17   6.20  15.58   28   2974   105  3.473  B96





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


http://cara.uai.it

Discovery  ( CBET 4681 )


R. Weryk, Institute for Astronomy, University of Hawaii, writes that three 45-s i-band exposures taken on 2019 Oct. 19.6 UT with the Pan-STARRS1 1.8-m reflector at Haleakala, Hawaii, in 1".0 seeing show a very condensed coma of diameter 1".6 and a straight tail about 2" long in p.a. 110 degrees.  Weryk also reports finding pre-discovery images of C/2019 T4 on four stacked 45-s w-band exposures taken on Feb. 2.3, which again show a very condensed coma of diameter about 1".5 (and magnitude 22.1-22.6) and no tail in 1".4 seeing; however, he remarks that the image appeared slightly extended.  H. Sato, Tokyo, Japan, finds a strongly condensed coma 8" in diameter and no tail on twelve stacked 60-s exposures taken with a 0.51-m f/6.8 astrograph at Siding Spring on Oct. 22.7; the magnitude was 19.0 as measured within a circular aperture of radius 4".9