What to expect from Green Comet C/2022 E3 ZTF in February 2023

Comet C/2022 E3 ZTF dims as it rapidly heads south this month. Catch it while you can!

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Published: January 31, 2023 at 3:21 pm

Assuming that it continues to follow predictions, comet C/2022 E3 ZTF will be in naked-eye territory this month, and fairly well-placed for viewing from the UK.

On 1 February, the comet is located at high declination in the constellation of Camelopardalis, the Giraffe.

Not known for strong patterns, the faint stars of Camelopardalis will make finding the comet that little bit harder.

Find out more in our Comet C/2022 E3 ZTF blog

Comet C/2022 E3 ZTF is expected to dim as it rapidly heads south in February 2023. Credit: Pete Lawrence

Comet C2022 E3 ZTF: February dates and times

At 00:00 UT on 1 February, Comet E3 is located 2° south of mag. 4.6 HIP 33694, the star that marks the top of the giraffe’s head.

This star is, in itself, quite tricky to identify.

The best we can do is to suggest looking at the point midway between Dubhe (Alpha (α) Ursae Majoris) and Segin (Epsilon (ε) Cassiopeiae).

HIP 33694 sits more or less half way between these two brighter and more identifiable stars.

C/2022 E3 (ZTF) photographed on 19 January 2023 by José J. Chambo from Valles, Valencia, Spain.

At 00:00 UT on 2 February, Comet E3 will have progressed to another ‘main’ star of Camelopardalis, HIP 29997, with C/2022 E3 lying 1° to the north of this mag. 4.8 star on this date.

As it continues on its south-southwest journey, the comet thankfully passes into a region of more identifiable stars within Auriga, the Charioteer.

Unfortunately, as it does so it will be slowly beginning to fade.

5/6 February: Comet C/2022 E3 ZTF passes close to Capella, although a bright Moon will spoil the view. Credit: Pete Lawrence

On the night of 5/6 February, C/2022 E3 ZTF is very conveniently positioned 1° west-northwest to west of Capella (Alpha (α) Aurigae).

At 03:00 UT on 6 February, the comet is located 1.5° due west of the star and expected to appear at mag. 5.2.

It passes immediately west of the Kids asterism formed by Eta (η) and Zeta (ζ) Aurigae during the morning of 7 February, and lies two-thirds of a degree to the west of Hassaleh (Iota (ι) Aurigae) on the evening of 8 February.

Credit: Pete Lawrence

Its subsequent track takes it east of Mars. On the night of 10/11 February it lies northeast of the mag. 0.0 planet, and on 11/12 February it can be found to the southeast.

This is the time C/2022 E3 ZTF is expected to have an integrated magnitude of +6.0, theoretically moving into binocular territory, although in truth it was probably here for most of the month anyway.

At 00:00 UT on 15 February, the comet sits 1.5° east of Aldebaran (Alpha (α) Tauri), heading south to track just west of the curved line formed from Pi1 (≠1) to Pi6 (≠6) Orionis between 18 February through to the start of March.

By the time the end of the month has arrived, it is expected to have faded to mag. +8.1.

This guide originally appeared in the February 2023 issue of BBC Sky at Night Magazine.

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