Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:45  
clear_day Transit: 12:57  
SunsetSet: 21:09 south
wb_twilight Astronomical TwilightWhat's Visible Now

Bright Comets

This page provides a comprehensive list of the bright comets currently visible in the sky. This list is updated with new information several times per day. Comets for which there is data from recent observations reported in the Comet Observation database (COBS) are listed first, in order of decreasing brightness. When data from recent observations is not available, the magnitude provided by the JPL Horizons datasets is used as an estimation of the brightness.

Credits for comet observation data: COBS Comet Observation Database – CC BY-NA-SA 4.0

Visibility from selected location
visibility = visible to the naked eye
stars = binocular, brighter than 10th magnitude
launcher_assistant_on Current altitude ≥ 30°   launcher_assistant_on Current altitude < 30°   launcher_assistant_on Below the horizon
 From: Greenwich, United Kingdom edit_location_alt
C/2021 T4 (Lemmon)

C/2021 T4 (Lemmon)   launcher_assistant_on

Magnitude: 10.4 (Observed - COBS) trending_up
Coma Diameter: 4.0'
Tail Length: n/a
Observation Date: 2023-05-31
RA: 00h 42m 03s   Decl: -15° 01’ 39”
in Cetus
C/2023 E1 (ATLAS)

C/2023 E1 (ATLAS)   launcher_assistant_on

Magnitude: 11.7 (Observed - COBS) trending_up
Coma Diameter: 4.2'
Tail Length: n/a
Observation Date: 2023-06-02
RA: 12h 28m 47s   Decl: +70° 50’ 47”
in Draco
C/2022 A2 (PANSTARRS)

C/2022 A2 (PANSTARRS)   launcher_assistant_on

Magnitude: 12.1 (Observed - COBS) trending_down
Coma Diameter: 1.3'
Tail Length: n/a
Observation Date: 2023-05-31
RA: 00h 57m 12s   Decl: +36° 17’ 49”
in Andromeda
C/2019 U5 (PANSTARRS)

C/2019 U5 (PANSTARRS)   launcher_assistant_on

Magnitude: 12.2 (Observed - COBS) trending_down
Coma Diameter: n/a
Tail Length: n/a
Observation Date: 2023-05-27
RA: 10h 25m 01s   Decl: -05° 15’ 07”
in Sextans
C/2020 K1 (PANSTARRS)

C/2020 K1 (PANSTARRS)   launcher_assistant_on

Magnitude: 12.3 (Observed - COBS) trending_flat
Coma Diameter: 1.0'
Tail Length: n/a
Observation Date: 2023-05-27
RA: 21h 09m 54s   Decl: -75° 33’ 18”
in Octans
237P/LINEAR

237P/LINEAR   launcher_assistant_on

Magnitude: 12.5 (Observed - COBS) trending_flat
Coma Diameter: 0.9'
Tail Length: n/a
Observation Date: 2023-05-31
RA: 20h 00m 48s   Decl: -06° 37’ 52”
in Aquila
C/2019 T4 (ATLAS)

C/2019 T4 (ATLAS)   launcher_assistant_on

Magnitude: 14.0 (Observed - COBS) trending_down
Coma Diameter: 2.2'
Tail Length: n/a
Observation Date: 2023-06-02
RA: 15h 18m 37s   Decl: +21° 29’ 18”
in Serpens
C/2022 W3 (Leonard)

C/2022 W3 (Leonard)   launcher_assistant_on

Magnitude: 14.7 (Observed - COBS) trending_up
Coma Diameter: 1.8'
Tail Length: 1.3'
Observation Date: 2023-05-28
RA: 01h 45m 28s   Decl: +63° 48’ 51”
in Cassiopeia
C/2022 L2 (ATLAS)

C/2022 L2 (ATLAS)   launcher_assistant_on

Magnitude: 15.8 (Observed - COBS) trending_up
Coma Diameter: 1.1'
Tail Length: n/a
Observation Date: 2023-06-02
RA: 17h 11m 28s   Decl: +22° 54’ 38”
in Hercules
C/2020 R7 (ATLAS)

C/2020 R7 (ATLAS)   launcher_assistant_on

Magnitude: 16.0 (Observed - COBS) trending_down
Coma Diameter: 0.6'
Tail Length: n/a
Observation Date: 2023-05-29
RA: 16h 32m 54s   Decl: +32° 10’ 33”
in Hercules
C/2023 A3 (Tsuchinshan-ATLAS)

C/2023 A3 (Tsuchinshan-ATLAS)   launcher_assistant_on

Magnitude: 17.1 (Observed - COBS) trending_up
Coma Diameter: n/a
Tail Length: n/a
Observation Date: 2023-05-28
RA: 14h 25m 25s   Decl: +03° 17’ 49”
in Virgo
12P/Pons-Brooks

12P/Pons-Brooks   launcher_assistant_on

Magnitude: 17.3 (Observed - COBS) trending_up
Coma Diameter: 0.4'
Tail Length: n/a
Observation Date: 2023-05-28
RA: 19h 20m 52s   Decl: +50° 26’ 59”
in Cygnus
C/2020 V2 (ZTF)

C/2020 V2 (ZTF)   launcher_assistant_on

Magnitude: 12.1 (Predicted - JPL) trending_up
RA: 02h 58m 14s   Decl: +20° 09’ 16”
in Aries
C/2017 K2 (PANSTARRS)

C/2017 K2 (PANSTARRS)   launcher_assistant_on

Magnitude: 13.8 (Predicted - JPL) trending_down
RA: 05h 31m 37s   Decl: -15° 28’ 27”
in Lepus
C/2021 S3 (PANSTARRS)

C/2021 S3 (PANSTARRS)   launcher_assistant_on

Magnitude: 13.8 (Predicted - JPL) trending_up
RA: 06h 24m 26s   Decl: -23° 49’ 38”
in Canis Majoris
81P/Wild

81P/Wild   launcher_assistant_on

Magnitude: 14.4 (Predicted - JPL) trending_down
RA: 17h 25m 04s   Decl: -18° 15’ 42”
in Ophiucus
126P/IRAS

126P/IRAS   launcher_assistant_on

Magnitude: 14.4 (Predicted - JPL) trending_up
RA: 01h 14m 07s   Decl: -05° 31’ 30”
in Cetus
C/2022 E3 (ZTF)

C/2022 E3 (ZTF)   launcher_assistant_on

Magnitude: 14.6 (Predicted - JPL) trending_down
RA: 05h 44m 32s   Decl: -16° 24’ 06”
in Lepus
185P/Petriew

185P/Petriew   launcher_assistant_on

Magnitude: 14.6 (Predicted - JPL) trending_up
RA: 01h 44m 15s   Decl: +18° 17’ 44”
in Pisces
364P/PANSTARRS

364P/PANSTARRS   launcher_assistant_on

Magnitude: 15.3 (Predicted - JPL) trending_down
RA: 01h 26m 04s   Decl: -06° 27’ 09”
in Cetus
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