Comet Chasing in June

Comet chasing is the visual observation of telescopic comets.  Jump to:  Observing synopses    Summary data

News

There are two comets visible in a 6-inch (15cm)  telescope this month. Many more are visible in larger instruments. 

  • C/2023 E1 (ATLAS) was discovered by the ATLAS survey on March 1. Later that month, on March 23, Norbert Mrozek reported that the comet was significantly brighter than initially anticipated. Towards the end of April, its brightness appeared to increase again, potentially by up to three magnitudes. However, these measurements show a large degree of variability, which may be due to the inclusion of varying amounts of the faint outer diameter of the comet. The comet is set to reach its perihelion, or closest point to the sun, in early July. It will also approach relatively close to earth, at a distance of 0.4 Astronomical Units (AU), on July 1. Current predictions estimate that the comet will achieve its maximum brightness, with a magnitude of 11.3, in early August, although it could potentially become even brighter.

  • C/2023 A3 (Tsuchinshan-ATLAS) is a discovery made independently by Purple Mountain Observatory (China) and the ATLAS survey (South Africa) that has the potential to be a bright naked eye comet. Currently it is magnitude 18. It will reach perihelion on September 28, 2024, when it will be within 0.5 AU of the earth and 0.4 AU from the sun.. It is predicted to reach maximum brightness in early October. On October 12, 2024 this comet will be moving quickly across the sky at a peak rate of 14 "/min.

  • C/2020 K1 (PANSTARRS) will reach perihelion in early May. It is predicted to obtain a maximum brightness of magnitude 12.5 in early June.

  • 237P/LINEAR will next reach perihelion in mid May. It is predicted to reach maximum brightness of magnitude 12.5 in early July.

  • C/2017 K2 (PANSTARRS) passed perihelion in mid December 2022 and is fading.

  • C/2021 T4 (ATLAS) C/2019 T4 (ATLAS) is past perihelion, which occurred in early June 2022, and is fading.

  • C/2020 V2 (ZTF) will reach perihelion in early May 2023. It is predC/2022 E3 (ZTF) passed perihelion in mid January 2023. On January 12 this comet passed within 0.3 AU of the earth. It was brightest, at magnitude 4.2, in late January, but will be observable in the evening in early February. This comet has been dubbed the "Green Comet" in the mass media, although that color isn't unusual for comets. This is actually a fainter comet, which only appears bright to us because it happened to pass close to the earth as it was closest to the sun. This is also the reason its tail geometry has been so complex and quickly changing. 

  • 96P/Machholz is a sun grazing comet with an orbital period of 5.3 years. It passed close to the sun on January 30, when it was best observed via solar monitoring satellites such as SOHO. 

  • C/2022 A2 (PANSTARRS) passed perihelion in mid February.  

  • 81P/Wild passed perihelion in mid December and is fading. 

  • C/2019 L3 (ATLAS) is well past perihelion, which occurred in early January 2022. 

  • 73P/Schwassmann-Wachmann passed perihelion on August 25. This comet has a long history of fragmentation, and some very faint fragments have been identified. 

  • C/2022 P1 (NEOWISE) passed perihelion in late November. It was reported to have brightned in late August and is currently predicted to reach maximum brightness of magnitude 13.3 in early November. It appears to be a periodic comet with a period of 94 years, leading to a previous perihelion in approximately 1928.

  • 29P/Schwassmann-Wachmann has frequent outbursts, typically resulting in a brightening of 0.5 - 1.0 magnitudes, which occur roughly every 59 days, typically taking 5-10 days to subside. Up to three subsequent outbursts may occur 5-10 days afterward, each typically smaller than the last, although on some occasions they can be even brighter than the first. These outbursts make 29P one of the most interesting comets to follow, both visually and scientifically. 29P/Schwassmann-Wachmann has a 14.8-year orbital period, and last passed perihelion in early March 2019. It varies in its distance from the Sun from 5.8 AU (at perihelion) to 6.3 AU (at aphelion), which is an unusually small variation for a comet, and remains quite far from the sun at all times. This means that it can be observed more or less continuously.

  • C/2014 UN271 (Bernardinelli-Bernstein) is an interesting Oort cloud comet that was reported as a result of the Dark Energy Survey. Soon after it was made public, images showed a cometary coma. Discovery credit goes to Pedro Bernardinelli and Gary Bernstein. This is a remarkable comet that was at 29 AU in 2014, with a perihelion of 10.9 AU in 2031. Its orbit extends out to 40,000 AU! It was unusually bright for its distance. Recent HST obsrvations that isolate the nucleus estimate the diamter to be between 120 and 140 km, making this possibly the largest comet nucleus yet measured. Because of its distant perihelion, this comet is not expected to become bright enough to be visually observed except in large instruments, and not until the end of the decade, but it is likely going to be the subject of intense scientific scrutiny. 

Comets that have apparently disentegrated: CC/2022 S3 (PANSTARRS), C/2021 P4 (ATLAS), C/2020 Q1 (Borisov), C/2020 P1 (NEOWISE), and C/2019 Y4 (ATLAS). Beware that various other sources often fail to keep track of whether or not a comet still exists!

Comet Visibility in the Eyepiece

This page uses code developed for SkyTools to predict the visibility of a comet in the eyepiece.  Predicting how much aperture is required to see a comet is a very complex task.  Have a look for yourself: a comparison of the predictions below (such as "visible in small telescopes") to the magnitude of each comet shows just how poor an indicator the magnitude alone really is. When you read below that a particular aperture is required to see a comet you can have a reasonable degree of confidence that the comet can in fact be seen in the eyepiece. But always remember, comets are like cats. They both have tails and do what they want, and not always what we expect. This is one of the things that makes comet chasing interesting!

Observing Synopses for June

Explanation of Comet Synopses and charts (read this if you have questions)

C/2017 K2 (PANSTARRS): A southern hemisphere evening comet visible in a 6-inch (15 cm) telescope
This comet begins the month in Eridanus at magnitude 10.4. Look for a 2' coma. It should fade by about 0.8 magnitudes, moving into Lepus by month's end. The best visibility is early in the month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Not visible Not visible Not visible Not visible Not visible  
Equator Low in the western sky during evening twilight at ~19:00 Low in the western sky during evening twilight at ~19:00 Not visible Not visible Not visible 1-15, 17-18
30o S Fairly high during evening twilight at ~18:40 Fairly high in the western sky during evening twilight at ~18:30 Fairly high in the western sky during evening twilight at ~18:40 Low in the western sky during evening twilight at ~18:30 Low in the western sky during evening twilight at ~18:30 1-

C/2021 T4 (Lemmon): A southern hemisphere morning comet visible in a 6-inch (15 cm) telescope
This comet begins the month in Cetus at magnitude 13.2. Look for a 1' coma. It should brighten by about 1.2 magnitudes by month's end. The best visibility is late in the month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Not visible Not visible Not visible Not visible Not visible  
Equator Not visible Not visible Fairly high in the eastern sky during morning twilight at ~04:50 Fairly high in the eastern sky during morning twilight at ~04:40 Fairly high during morning twilight at ~04:40 1-
30o S Not visible Not visible Fairly high during morning twilight at ~05:20 Fairly high at ~05:20 High at ~05:20 1-

C/2022 A2 (PANSTARRS): A morning comet visible in a 10-inch (25 cm) telescope
This comet begins the month in Andromeda at magnitude 11.1. Look for a 1.5' coma. It should fade slowly.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Low in the northern sky during morning twilight at ~02:00 Low in the northern sky during morning twilight at ~01:30 Low in the northern sky during morning twilight at ~01:00 Low in the northern sky during morning twilight at ~00:50 Low in the eastern sky during morning twilight at ~00:40 1-
40o N Low in the eastern sky during morning twilight at ~03:30 Fairly high in the eastern sky during morning twilight at ~03:20 Fairly high in the eastern sky during morning twilight at ~03:00 Fairly high in the eastern sky during morning twilight at ~02:50 Fairly high in the eastern sky during morning twilight at ~02:50 1-
Equator Very low in the eastern sky during morning twilight at ~04:50 Low in the eastern sky during morning twilight at ~04:50 Low in the eastern sky during morning twilight at ~04:40 Fairly high in the eastern sky during morning twilight at ~04:40 Fairly high in the eastern sky during morning twilight at ~04:40 1-
30o S Not visible Not visible Not visible Not visible Low in the northern sky during morning twilight at ~05:30 20-

C/2020 K1 (PANSTARRS): A southern hemisphere morning comet visible in a 10-inch (25 cm) telescope
This comet begins the month in Indus at magnitude 12.6. Look for a 1.5' coma. It should brighten slowly, moving into Pavo by month's end. The best visibility is mid-month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Not visible Not visible Not visible Not visible Not visible  
Equator Fairly high at ~04:40 Fairly high in the southern sky during morning twilight at ~04:50 Fairly high in the southern sky in moonlight at ~04:30 Fairly high in the southern sky at ~04:30 Low in the southern sky at ~04:30 1-
30o S High at ~05:00 High during morning twilight at ~05:20 High in moonlight at ~04:50 High at ~05:00 High at ~04:50 1-

237P/LINEAR: A morning comet visible in a 10-inch (25 cm) telescope
This comet begins the month in Sagittarius at magnitude 13.1. Look for a 1.5' coma. It should brighten slowly, moving into Aquila by month's end.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible 1-
40o N Fairly high in the southern sky during morning twilight at ~03:20 Fairly high during morning twilight at ~03:20 Fairly high at ~03:00 Fairly high at ~02:50 Fairly high at ~02:40 1-
Equator High at ~04:30 High during morning twilight at ~04:50 High in moonlight at ~02:20 High at ~04:00 High at ~03:40 1-
30o S High at ~04:50 High during morning twilight at ~05:20 High in moonlight at ~02:20 High at ~04:00 High at ~03:40 1-

C/2019 L3 (ATLAS): An evening comet visible in a 10-inch (25 cm) telescope
This comet begins the month in Pyxis at magnitude 12.6. Look for a 50" coma. It should fade slowly. The best visibility is early in the month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Low in the southern sky during evening twilight at ~20:20 Not visible Not visible Not visible Not visible 1-13
Equator High in moonlight at ~19:10 High during evening twilight at ~19:10 High at ~19:20 High at ~19:20 High in moonlight at ~19:10 1-
30o S High in moonlight at ~18:50 High during evening twilight at ~18:30 High at ~18:50 High at ~18:40 High in moonlight at ~18:40 1-

C/2019 U5 (PANSTARRS): An evening comet visible in a 14-inch (36 cm) telescope
This comet begins the month in Leo at magnitude 12.6. Look for a 1.5' coma. It should fade slowly, moving into Sextans by month's end.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Fairly high in the southern sky during evening twilight at ~22:00 Fairly high in the southern sky during evening twilight at ~22:20 Low in the western sky during evening twilight at ~22:40 Not visible Not visible 1-19
40o N High in moonlight at ~20:40 High during evening twilight at ~20:40 High at ~21:00 Fairly high during evening twilight at ~21:00 Fairly high during evening twilight at ~21:00 1-
Equator Fairly high in the western sky in moonlight at ~01:00 High during evening twilight at ~19:10 High at ~19:30 High at ~19:20 High in moonlight at ~19:20 1-
30o S Fairly high in the western sky at ~00:50 High during evening twilight at ~18:30 High at ~19:20 High at ~18:50 High in moonlight at ~18:40 1-

C/2022 E3 (ZTF): A southern hemisphere evening comet visible in an 18-inch (46 cm) telescope
This comet begins the month in Lepus at magnitude 12.1. Look for a 1.5' coma. It should fade by about 1.1 magnitudes by month's end. The best visibility is early in the month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Not visible Not visible Not visible Not visible Not visible  
Equator Fairly high in the western sky during evening twilight at ~19:10 Low in the western sky during evening twilight at ~19:10 Low in the western sky during evening twilight at ~19:00 Not visible Not visible 1-17
30o S Fairly high during evening twilight at ~18:50 Fairly high in the western sky during evening twilight at ~18:40 Fairly high in the western sky during evening twilight at ~18:40 Fairly high in the western sky during evening twilight at ~18:30 Low in the western sky during evening twilight at ~18:30 1-

364P/PANSTARRS: A southern hemisphere morning comet visible in an 18-inch (46 cm) telescope
This comet begins the month in Aquarius at magnitude 13.2. Look for a 45" coma. It should fade rapidly, moving into Cetus by month's end. The best visibility is early in the month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Not visible Not visible Not visible Not visible Not visible  
Equator Fairly high in the eastern sky during morning twilight at ~04:50 Fairly high in the eastern sky during morning twilight at ~04:50 Fairly high in the eastern sky during morning twilight at ~04:40 Fairly high in the eastern sky during morning twilight at ~04:40 Fairly high in the eastern sky during morning twilight at ~04:40 1-
30o S Fairly high in the eastern sky during morning twilight at ~05:10 Fairly high during morning twilight at ~05:20 Fairly high during morning twilight at ~05:20 Fairly high at ~05:20 Fairly high at ~05:20 1-

C/2023 E1 (ATLAS): A northern hemisphere evening comet visible in very large telescopes
This comet begins the month in Ursa Major at magnitude 13.7. Look for a 2.5' coma. It should brighten by about 0.9 magnitudes, moving into Draco by month's end.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N High during morning twilight at ~02:00 High during evening twilight at ~22:20 High during evening twilight at ~23:40 High during evening twilight at ~23:50 High during evening twilight at ~00:00 1-
40o N High at ~02:30 High during evening twilight at ~20:40 High at ~21:20 High at ~21:20 High at ~00:50 1-
Equator Fairly high in the northern sky at ~01:20 Fairly high in the northern sky during evening twilight at ~19:10 Fairly high in the northern sky at ~20:50 Fairly high in the northern sky at ~20:20 Fairly high in the northern sky in moonlight at ~20:00 5-
30o S Not visible Not visible Not visible Not visible Not visible  

71P/Clark: A southern hemisphere morning comet visible in very large telescopes
This comet begins the month in Aquarius at magnitude 13.2. Look for a 1.5' coma. It should fade slowly, moving into Cetus by month's end. The best visibility is early in the month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Not visible Not visible Not visible Not visible Not visible  
Equator Fairly high in the eastern sky during morning twilight at ~04:40 Fairly high during morning twilight at ~04:50 Fairly high during morning twilight at ~04:40 Fairly high at ~04:40 Fairly high at ~04:40 1-
30o S Fairly high at ~05:10 Fairly high during morning twilight at ~05:20 Fairly high in moonlight at ~05:10 High at ~05:10 High at ~05:20 1-

C/2019 T4 (ATLAS): An evening comet visible in very large telescopes
This comet begins the month in Serpens Caput at magnitude 13.3. Look for a 1.5' coma. It should fade slowly.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N High during morning twilight at ~02:00 High during evening twilight at ~22:20 High during evening twilight at ~00:00 High during evening twilight at ~23:50 High during morning twilight at ~00:00 1-
40o N High at ~02:30 Fairly high during evening twilight at ~20:40 High at ~00:00 High at ~23:30 High at ~00:50 1-
Equator High at ~01:50 Fairly high in the eastern sky in moonlight at ~20:10 High at ~00:00 High at ~23:30 High at ~00:20 1-
30o S High at ~01:10 High in moonlight at ~00:40 High at ~00:00 Fairly high at ~23:30 Fairly high at ~23:40 1-4, 6-

C/2022 P1 (NEOWISE): A southern hemisphere morning comet visible in very large telescopes
This comet begins the month in Norma at magnitude 13.7. Look for a 5.5' coma. It should fade by about 1.2 magnitudes, moving into Centaurus by month's end. The best visibility is early in the month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Not visible Not visible Not visible Not visible Not visible  
Equator High at ~01:50 Not visible Not visible Not visible Not visible 1-2, 10-12
30o S High at ~01:40 Not visible High at ~23:40 Not visible Not visible 1-3, 9-18

C/2021 Y1 (ATLAS): A southern hemisphere evening comet visible in very large telescopes
This comet begins the month in Eridanus at magnitude 13.9. Look for a 1' coma. It should remain constant, moving into Columba by month's end. The best visibility is early in the month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Not visible Not visible Not visible Not visible Not visible  
Equator Low in the western sky during evening twilight at ~19:00 Low in the western sky during evening twilight at ~19:00 Not visible Not visible Not visible 1-9
30o S Fairly high in the western sky during evening twilight at ~18:40 Fairly high in the western sky during evening twilight at ~18:30 Fairly high in the western sky during evening twilight at ~18:40 Fairly high in the western sky during evening twilight at ~18:30 Fairly high in the western sky during evening twilight at ~18:30 1-

29P/Schwassmann-Wachmann: An evening comet visible in very large telescopes
This comet begins the month in Gemini at magnitude 14.0. Look for a 1' coma. It should fade slowly.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Fairly high during evening twilight at ~20:30 Fairly high in the western sky during evening twilight at ~20:40 Fairly high in the western sky during evening twilight at ~20:50 Not visible Not visible 6-18
Equator Fairly high in moonlight at ~19:10 Fairly high during evening twilight at ~19:10 Fairly high in the western sky at ~19:10 Fairly high in the western sky during evening twilight at ~19:10 Not visible 6-26
30o S Not visible Not visible Not visible Not visible Not visible 7-12

C/2021 S3 (PANSTARRS): A southern hemisphere evening comet visible in very large telescopes
This comet begins the month in Lepus at magnitude 14.4. Look for a 45" coma. It should brighten slowly, moving into Canis Major by month's end. The best visibility is mid-month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Not visible Not visible Not visible Not visible Not visible  
Equator Fairly high in the western sky during evening twilight at ~19:10 Fairly high in the western sky during evening twilight at ~19:10 Low in the western sky during evening twilight at ~19:10 Low in the western sky during evening twilight at ~19:10 Low in the western sky during evening twilight at ~19:00 1-27
30o S High during evening twilight at ~18:50 High during evening twilight at ~18:30 Fairly high at ~18:40 Fairly high during evening twilight at ~18:30 Fairly high in the western sky during evening twilight at ~18:30 1-

77P/Longmore: An evening comet visible in very large telescopes
This comet begins the month in Centaurus at magnitude 14.5. Look for a 50" coma. It should fade slowly. The best visibility is mid-month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Low in the southern sky in moonlight at ~23:40 Low in the southern sky at ~21:10 Low in the southern sky at ~22:10 Low in the southern sky at ~21:40 Low in the southern sky in moonlight at ~21:20 1-2, 6-29
Equator High at ~01:40 Fairly high in the eastern sky during evening twilight at ~19:10 High at ~22:10 High at ~21:40 Fairly high at ~00:00 1-3, 5-30
30o S High at ~01:10 Fairly high during evening twilight at ~18:30 High at ~22:10 High at ~21:40 High at ~23:40 1-3, 5-30

81P/Wild: A morning comet visible in very large telescopes
This comet begins the month in Sagittarius at magnitude 14.6. Look for a 1.5' coma. It should fade by about 1.4 magnitudes, moving into Ophiuchus by month's end. The best visibility is early in the month as seen from the southern hemisphere.  FINDER CHART
Latitude Visibility April 29 Visibility May 6 Visibility May 13 Visibility May 20 Visibility May 27 Nights Visible
55o N Not visible Not visible Not visible Not visible Not visible  
40o N Fairly high at ~03:10 Not visible Not visible Not visible Not visible 1-2
Equator High at ~03:20 Not visible High at ~01:50 High at ~01:50 Not visible 1-3, 11-20
30o S High at ~03:20 Not visible High at ~01:30 High at ~01:50 Not visible 1-3, 11-20

Summary Data for This Month's Telescopic Comets

Comets brighter than 16th magnitude.  This table is updated as necessary. The last column indicates the date of the last observation used to compute these values.  The constellation listed is where the comet was on the first of the month.
Comet Constellation

June 1st

June 15th

June 30th

 Observations as of (UT)
Mag Diam Mag Diam Mag Diam
C/2020 V2 (ZTF) Aries 10.3 3.0' 10.2 3.2' 10.2 3.4' 2023 April 18
C/2017 K2 (PANSTARRS) Lepus 11.2 1.9' 11.6 1.8' 11.9 1.8' 2023 April 23
C/2022 A2 (PANSTARRS) Andromeda 11.5 1.5' 11.7 1.6' 11.8 1.6' 2023 April 28
C/2021 T4 (Lemmon) Cetus 11.5 1.6' 10.7 2.1' 9.6 3.2' 2023 May 24
C/2020 K1 (PANSTARRS) Pavo 12.4 1.3' 12.4 1.3' 12.5 1.3' 2023 April 30
C/2023 E1 (ATLAS) Draco 12.5 2.7' 12.0 2.9' 11.7 3.2' 2023 May 31
237P/LINEAR Aquila 12.6 1.1' 12.5 1.2' 12.4 1.3' 2023 May 31
C/2019 L3 (ATLAS) Pyxis 13.0 48" 13.1 46" 13.3 44" 2023 April 26
C/2019 U5 (PANSTARRS) Sextans 13.1 1.5' 13.3 1.4' 13.5 1.3' 2023 May 27
C/2022 E3 (ZTF) Lepus 13.2 1.4' 13.6 1.3' 14.0 1.3' 2023 April 29
C/2019 T4 (ATLAS) Serpens Caput 13.5 1.2' 13.7 1.2' 13.9 1.1' 2023 April 28
71P/Clark Cetus 13.6 58" 13.8 60" 13.9 1.0' 2023 May 25
C/2021 Y1 (ATLAS) Columba 13.7 1.0' 13.8 1.0' 13.9 1.0' 2023 May 19
364P/PANSTARRS Cetus 13.9 21" 15.2 18" 16.7 15" 2023 May 23
C/2021 S3 (PANSTARRS) Canis Major 14.0 43" 13.7 44" 13.5 46" 2023 April 11
77P/Longmore Centaurus 14.4 44" 14.6 41" 14.9 37" 2023 May 23
81P/Wild Ophiuchus 14.5 56" 15.0 53" 15.7 48" 2023 May 26
185P/Petriew Pisces 14.7 1.3' 14.3 1.4' 14.0 1.4' 2023 May 25
126P/IRAS Cetus 14.7 3.4' 14.4 3.6' 14.2 3.9' 2023 May 19
29P/Schwassmann-Wachmann Gemini 14.7 33" 14.8 33" 14.8 32" 2023 May 6
C/2022 P1 (NEOWISE) Hydra 15.1 3.3' 15.8 2.9' 16.6 2.4' 2023 May 19
C/2022 L2 (ATLAS) Hercules 15.3 43" 15.1 45" 15.0 45" 2023 May 28
C/2022 W3 (Leonard) Cassiopeia 15.3 30" 15.0 33" 14.6 38" 2023 April 18
C/2021 X1 (Maury-Attard) Cetus 15.4 34" 15.3 36" 15.2 38" 2023 March 11
C/2021 G2 (Atlas) Pyxis 15.4 40" 15.4 40" 15.4 39" 2023 April 13
C/2022 E2 (ATLAS) Hydra 15.6 31" 15.6 30" 15.5 30" 2023 May 19
117P/Helin-Roman-Alu Cetus 15.9 1.3' 15.9 1.4' 15.8 1.4' 2023 May 25
C/2020 R7 (ATLAS) Hercules 16.0 47" 16.1 45" 16.3 42" 2023 May 29
103P/Hartley Pegasus 16.4 1.3' 15.5 1.5' 14.5 1.8' 2023 May 21
*In solar conjunction and generally not visible 

For information about specific comets see Gary W. Kronk's Cometography 

Further reading: see Comet Chasing, Sky & Telescope, April 2005, pg. 83.

Make your own visual observing custom charts for your location and telescope/binoculars: Software for visual comet observing 

Select comets that are appropriate for your imaging system, and plan when they are best imaged: Software for comet imaging 
 

Links

Skyhound's Guide to Comets
Skyhound's Guide to Finding Comets
BAA Comet Section
Weekly Information About Bright Comets
Cometography