Contact information

Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

C/2022 E3 (ZTF) - 20.1.2023 at 21.04 - 20.1.2023 at 21.25 Orimattila, Artjärvi, Tähtikallio Observation number 111799

Visibility V / V

C/2022 E3 (ZTF) The comet was imaged on the first evening of the 2023 January talcos. A comet on a hyperbolic orbit was discovered by the Palomar Mountain ZTF variable object search program (I41 Palomar Mountain ZTF) on 2022 March 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 comet will enter perihelion on January 12, 2023. 1.11au from the sun. When photographing the comet, it was 0.48464au away in the Bear Guard, closest to it. it will be 0.29au on February 2, 2023. At its brightest, the comet will be clearly visible through binoculars (perhaps with the naked eye) at the end of January 2023. We have photographed this before.

1Fig. stacked 1-11 images L120s sum image according to stars, fast movement is visible. There are no asteroids below 24.0 mag in the picture.

2Fig. Stacked L120s sum image of images 1-11 by comet.

3Fig. Same stack MaximDL Histogram Specification with Gaussian stretching. Tail 2000" went over the picture area (33'), comma 730" (12').

4Figure Same stack with MaximDL Histogram Specification Rayleight stretch. This comet would have needed a wider field of view.

5Fig. first image measured, 2023-01-20T 19:04:13UT 2459965.29459JDUT 15h33m24.12s +50d45'52.4" N11.922mag Std Dev 9178.676 SNR257.469 FWHM12.718" ,JPL Horizon 19:04:13m24.12s +25d45'52.4" '45.4" T9.148mag .

6Fig. last image measured, 2023-01-20 19:24:54UT 2459965.30895JDUT 15h33m21.11s +50d47'42.4" N10.970mag Std Dev 11050.509 SNR144.331 FWHM10.149" ,JPL Horizon 19:24:573m247m 15hd47'42.4" '37.9" T9.148magmag .

TYC 3489-158-1 12.12mag star used for brightness measurement calibration.

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • C/2022 E3 (ZTF)
  • Seeing
    • Average
Technical information

Alluna RC16, C415/3320, Moravian G4-16000EC MkII, filter L, bin3 11 x 120s

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