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Observation date

image

Photometry

(FOCAS)

Afρ

astrometry

Observatory

20200106

X

X


X

I89 - Nerpio, Spain

20200115

X

X


X

B96 - BRIXIIS

20200119

X

X


X

B96 - BRIXIIS

















































Comet C/2019 Y4 (ATLAS)

Photometric data obtained from FOCAS-II software


COD B96

OBS BRIXIIS Observatory

CATALOG: Gaia DR2 - BAND: G


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

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

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

C/2019 Y4     06/01/2020 04:18:14  18.90  18.60  18.64                        6.3  20.6  I89

C/2019 Y4     06/01/2020 04:18:14*  0.14   0.25   0.22                          7   2.5  Gai

C/2019 Y4     19/01/2020 23:26:57  18.09  17.60  17.43                        4.1  17.5  B96

C/2019 Y4     19/01/2020 23:26:57*  0.30   0.27   0.39                          3   3.7  Gai


                                                                     AFRHO         LOG

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

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

C/2019 Y4     06/01/2020 04:18:14    2.22   2.81  12.43  18.81    6     11     2  1.049  I89

C/2019 Y4     19/01/2020 23:26:57    1.89   2.62  14.56  17.84    4     17     4  1.237  B96



FoCAs 3.66

www.astrosurf.com/cometas-obs

es.groups.yahoo.com/group/Cometas_Obs

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


http://cara.uai.it

M.P.E.C. : 2020 - A112        



                                 COMET C/2019 Y4 (ATLAS)                            


     This object was reported on 2019 Dec. 28 UT as possibly cometary in appearance by L. Denneau on behalf of ATLAS-MLO (T08) and placed on PCCP.  Stacked observations taken on Dec. 31 by L. Buzzi at Schiaparelli Observatory (204) revealed a 10" coma elongated toward the north-west.  

The orbital elements for this object are very similar to those for C/1844 Y1 (Great Comet).  The suggestion was initially made by M. Meyer when the 2019-2020 arc was ~three days.  Additional reports of cometary features are as follows:


OC   Date     Reporter           Coma    Tail    PA          Exposures

Q11  Dec. 31  H. Sato            18"                         10x90s

K88  Jan. 1   K. Sarneczky        8"                         3x120s

G40  Jan. 1   B. Lutkenhoener    10"

T08  Dec. 28  H. Flewelling       2"

T12  Jan. 1   D. J. Tholen                       315

203  Jan. 6   G. Galli            4"

I89  Jan. 6   E. Bryssinck       21"      17"    280-287     

A71  Jan. 3   M. Jaeger          10"      25"    270-275

H06  Jan. 4   H. Sato             8"      15"    280         10x60s

A77  Jan. 8   F. Kugel           20"      30"    280

G40  Jan. 9   G. Gasparovic      10"      20"     10         23x50s

Maik Meyer (DE) has established that the orbital elements are similar to those of comet C/1844 Y1 (Great Comet) and comet C/2019 Y4.

T. Kobayashi then recalculated the orbit of the great comet of 1844 based on 44 observations

the calculations and orbital element show a periodicity of about 2700 years

Comet C/2019 Y4 (ATLAS) - Orbit - The Sky Live