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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Binocular comet ZTF - 2.12.2022 at 20.58 - 2.12.2022 at 21.13 Orimattila, Artjärvi, Tähtikallio Observation number 111424

Visibility III / V

Comet C/2020 V2 (ZTF) was imaged on the first night of the 2022 December talcos. A comet on a hyperbolic orbit was discovered by the Palomar Mountain ZTF Variable Object Discovery Program (I41 Palomar Mountain ZTF) on 2020 November 2. The Zwicky Transient Facility (ZTF) is a wide-field search program for supernovae and other rapidly changing objects based on the Samuel Oschin telescope, a 48" Schmidt telescope and a wide-field camera. The perihelion comet will arrive on 2023-05-08 2.235au from the sun. When photographing the comet, it was 2.3609au away in Ursa Major, the closest it will be is 1.855 au on September 17, 2023. The comet will be at its brightest between June and September 2023, estimated at T9-10 mag. We have photographed this comet several times. The photographing was hampered by a nearby cell phone tower, which caused a strong gradient, the direction of which was exactly in the direction of a possible tail. From changing weather conditions was also a disadvantage.

1Fig. stacked 1-11 images L120s sum image according to stars, movement is not visible. There are no asteroids under 24.0 mag in the picture.

2Fig. stacked 1-11 images L120s sum image by comet. Coma 77" (1.3') and tail 174" (2.9').

3Fig. first image measured, 2022-12-02T 18:58:32UT 2459916.29064JDUT 11h04m32.95s +74d53'37.5" N12.677mag Std Dev 875.055 SNR209.117 FWHM12.659" ,JPL Horizon 18:58:32UT +72d723m 14h054s '35.6" T12.001mag .

4Fig. last image measured, 2022-12-02T 19:13:03UT 2459916.30072JDUT 11h04m31.89s +74d53'59.2" N13.130mag Std Dev 439.166 SNR80.759 FWHM8.491" ,JPL Horizon 19:13:03UT 11.75d734m3 '57.8" T12.001mag .

TYC 4391-1216-1 12.93mag star used for brightness measurement calibration.

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Additional information
  • Observation target
    • Comet
  • Visibility of the comet
    • Binocular comet
  • Name of the observation target
    • C/2020 V2 (ZTF)
  • Tail length
  • 2.9 arc minutes
  • Coma diameter
  • 1.3 kaariminuuttia
  • Weather
    • Säätilan muuttuessa ainoastaan sarjan 8 kuvaa 11 oli mittauskelpoisia.

Technical information

Alluna RC16, C415/3320, Moravian G4-16000EC MkII, filter L, bin3 8 x 120s

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