Comet – Astronomy Now

Comet 2P/Encke on close approach to Earth

11 September 2023 Mark Armstrong

For the next month or so you can see the return of periodic comet 2P/Encke (Encke’s Comet).

Comet C/2023 P1 (Nishimura) brightening with nice tail

4 September 2023 Mark Armstrong

Comet C/2023 P1 (Nishimura) was discovered by on August 11 by Hideo Nishimura of Japan. It’s currently in the pre-dawn sky and visible through large binoculars, but you’ll need to observe as soon as possible this week.

New comet predicted to brighten rapidly as it sprints Sunwards

18 August 2023 Mark Armstrong

Comet C/2023 P1 (Nishimura) is a brand new comet discovered by on August 11 by Hideo Nishimura of Japan. In its one and only visit to the Solar System, it may reach magnitude +2 when at perihelion in September.

Catch Comet 2022 E3 (ZTF) this month

20 January 2023 Mark Armstrong

Comet 2022 E3 (ZTF) is of special interest this January as at the time of writing (mid-November) it appears well on-course to be an easy binocular object and perhaps a marginal naked-eye comet.

The largest comet ever seen has been measured – and it’s a whopper

14 April 2022 Keith Cooper

The nucleus of the largest known comet in the Solar System, C/2014 UN271 (Bernardinelli–Bernstein), has been measured by the Hubble Space Telescope to be 129 kilometres across.

Interstellar comet 2I/Borisov may be most pristine ever seen

31 March 2021 Astronomy Now

The interstellar comet 2I/Borisov may be the most pristine ever observed, astronomers say, an untarnished remnant of another star’s nursery.

A naked-eye comet graces our skies

7 July 2020 Mark Armstrong

Comet 2020 F3 (NEOWISE) is putting on a fine showing in the pre-dawn northern sky after emerging intact from perihelion (closest point to the Sun).

’Oumuamua was a unique object. Now astronomers think there could be trillions just like it

14 April 2020 Keith Cooper

The mysterious interstellar object 1I/‘Oumuamua, and trillions of others like it, could have formed when its parent body was pulled apart by gravitational tides from a star, resulting in elongated shards being ejected into interstellar space.

Get ready for Comet ATLAS (C/2019 Y4) in the northern spring sky!

2 April 2020 Ade Ashford

Comet C/2019 Y4 was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) on 28 December last year and brightened 6000-fold in just two months to attain magnitude +7.5 on 1 April. Alas, the comet’s nucleus has now fragmented, dashing hopes for a conspicuous naked-eye spectacle in the constellation of Perseus. Here’s our telescopic observing guide.

See Comet Iwamoto’s dash through Leo, Cancer and Gemini before full Moon

10 February 2019 Ade Ashford

Grab your binoculars to catch a glimpse of speedy Comet C/2018 Y1 Iwamoto over the coming week before the glare from a full Moon on 19 February drowns it out. Potentially attaining magnitude +6, the comet passes closest to Earth on 12 February when it can be found traversing Leo at a rate of 7.2 degrees/day. Don’t miss C/2018 Y1’s close enounter with galaxy NGC 2903 on 13 February – by eye, camera, or live online.