Newest observations

Contact information

Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Binocular comet ZTF - 20.1.2023 at 23.35 - 21.1.2023 at 00.45 Parainen Observation number 111531

Visibility III / V

Juha Ojanperä, Porin Karhunvartijat

My second observation of comet C/2022 E3 (ZTF), this time finally under dark skies and without hurry.

The first thing you notice about the comet is a round, hazy coma with a clear central brightness in the middle. The coma brightens rather sharply towards the center. The comet seems to be leaving a very dim and faint tail in the northwest direction. The tail is so flimsy that it is hard to tell how far the tail continues, but I estimate the length of the tail to be approx. 16'.

I also made a brightness observation of the comet with 10x50 binoculars. The observation method is the imprecise-inaccurate method. Reference stars: tau Her (3.9 mag) and TYC 3489-1588-1 (5.9 mag). Unfocused, the comet's brightness was almost the same as TYC 3489-1588-1, so I estimate the comet's brightness to be 5.9 magnitude. The comet was not visible to the naked eye, but it was easily visible with binoculars.

Coma diameter estimated using stars X (TYC 3489-48-1) and Y (TYC 3489-235-1)

DC: 7
Coma diameter: 7'
Tail direction: 338°
Tail length: about 16'
Brightness: 5.9 magnitude

More similar observations
Additional information
  • Observation target
    • Comet
  • Visibility of the comet
    • Binocular comet
  • Name of the observation target
    • C/2022 E3 (ZTF)
  • Brightness in magnitudes
    • 5.9
  • Tail length
  • 16 arc minutes
  • Coma diameter
  • 7 kaariminuuttia
  • Weather
    • Selkeää, tyyntä, ei kuuta, ei lunta, -1C, SQM: 21.07

Technical information

Telescope: N250/1200 mm, magnification: 50x, eyepiece: Baader Hyperion 24 mm, field of view: 82', graphite and pencil drawing for deep sky observation card

Send a comment

Comments are checked and moderated before publication If you want to contact the observer directly about possibilities to use these images, use the Media -form.



characters left

By sending in this comment I confirm, that I've read and understood the the observation system's privacy policy.