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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Telescopic comet ATLAS - 26.4.2020 at 00.05 - 26.4.2020 at 00.24 Orimattila, Artjärvi, Tähtikallio Observation number 90344

Visibility III / V


The comet C / 2019 Y4 (ATLAS) was filmed on the second night of the April work. The comet was discovered by ATLAS's asteroid search program The Asteroid Terrestrial-impact Last Alert System & #40;T08& #41; December 20, 2019. The asteroid was discovered by Mauna Loan (ATLAS-MLO) and identified as a comet by Larry Denneau, a senior software engineer at the University of Hawaii. The comet has an orbital period of about 4400 years. When photographing the comet was 0.956au away, the closest it will be 0.781au on May 24, 2020. 1Picture. stacked Average by comet. The comet has dimmed dramatically, with the core broken down into several parts.
2Picture. stacked according to the average comet. MaximDL Histogram Specification tool / Straight-Line stretch. Is there a large coma that is probably caused by the recent disintegration of the comet core?
3Picture. stacked Summit by the stars. The movement is displayed. Not less than 24.0mag asteroids.
4Picture. First image measured, A-fragment 2020-04-25T 21: 05: 00UT 2458965.37847JDUT 05h37m51.39s + 62d18'12.5 "N15.9mag Std Dev 190.947, JPL Horizon C / 2019 Y4-A (ATLAS) 21: 05: 00UT 05h37m54.01s + 62d18'29.6 "T15.47mag.
5Picture. Last image measured, A-fragment 21: 23: 46UT 2458965.39150JDUT 05h37m48.20s + 62d17'53.4 "N16.0mag Std Dev 184.092, JPL Horizon C / 2019 Y4-A (ATLAS) 21: 23: 46UT 05h37m50.89s + 62d18 '10 .6 "T15.47mag. TYC 4085-744-1 11.99mag stars used to calibrate the brightness measurement.



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Additional information
  • Observation target
    • Comet
  • Name of the observation target
    • C/2019 Y4 (ATLAS)
    • Keskitaso
  • Title for the comet
    • Telescopic comet
Technical information

Alluna RC16, C415 / 3320, SBIG 1001E, filter L, 10 x 120s

Comments: 2 pcs
Veikko Mäkelä - 2.5.2020 at 15.30 Report this

Enpä nyt ihan dramaattiseksi tuo himmenemistä sanoisi.  Kirkkais on pudonnut ehkä magnitudin verran, hiukan toista, huippustasosta.  Kohde on sinnitellyt tuossa 9 magnitudissa (koma kirkkaus siis) jo nelisen viikkoa.

Kari Laihia - 2.5.2020 at 17.26 Report this

Vertailin omia kuukauden takaisia mittauksiani 12.7mag=> 16mag . Näitten kirkkaushavaintojen kanssa on vähän niin ja näin. On monenlaisia menetelmiä, omat on ainakin jollain tavoin pyritty vakioimaan. En osaa verrata niitä muiden mittauksiin . Ehkä ei sitten kovin dramaattista :) .

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