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Comet C/2023 A3 (Tsuchinshan-ATLAS)

Below the horizon.  Rise: 18:54 | Tran: 3:47 | Set: 12:36
Alt: -2.60°   Az: 34.57°   Direction: North-East

Comet C/2023 A3 (Tsuchinshan-ATLAS) is in the constellation of Cygnus, at a distance of 519,736,099.0 kilometers from Earth. The current Right Ascension is 19h 38m 17s and the Declination is +28° 28’ 16” (apparent coordinates). The latest observed magnitude of Comet C/2023 A3 (Tsuchinshan-ATLAS) is 16.2 (data provided by COBS).

Finder Charts

Map showing Comet C/2023 A3 (Tsuchinshan-ATLAS) in Cygnus on June, 04 2025. Field of view: 50x30 degrees
View interactive star map
Sky map showing Comet C/2023 A3 (Tsuchinshan-ATLAS) in Cygnus on June, 04 2025. Field of view: 15x9 degrees. View in interactive sky chart

High precision deep sky finder chart, 60 arcmin wide, showing where Comet C/2023 A3 (Tsuchinshan-ATLAS) is right now. Click on the image to see a more detailed fullscreen tracker view.

C/2023 A3 (Tsuchinshan-ATLAS)
RA: 19h 37m 15s
Dec: +28° 24’ 45”
Deep sky finder chart for Comet C/2023 A3 (Tsuchinshan-ATLAS). Field of view: 60x40 arcmins. View in deep sky object tracker

Also check out Where is Comet C/2023 A3 (Tsuchinshan-ATLAS)?, a page that provides all the information needed to find Comet C/2023 A3 (Tsuchinshan-ATLAS) in the sky and additional links to sky charts.

Celestial Coordinates

Apparent

19h 38m 17s
+28° 28’ 16”
14h 40m 37s
10h 18m 55s

J2000

19h 37m 15s
+28° 24’ 45”

Additional Information

Cygnus
16.2
0.0'
n/a
2025-06-03
14.47

The observed values of Magnitude, Coma Diameter and Tail Length are derived from the most recent observation recorded at the Comet Observers Database. The value of Predicted Magnitude comes from the JPL Horizons ephemerides service and, in the case of comets, might be inaccurate given the highly dynamic and unpredictable behavior of these objects. When available, please refer to the Observed Magnitude value and consider the Predicted Magnitude as a directional indication. We acknowledge with thanks the comet observations from the COBS Comet Observation Database contributed by observers worldwide and used in this table to report recent comet observations.

Rise and Set Times

Today's rise, transit and set times of Comet C/2023 A3 (Tsuchinshan-ATLAS) from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 61.5°
Max altitude: 66.9°
Azimuth: 298.5°
  • C/2023 A3 (Tsuchinshan-ATLAS) is below the horizon from Greenwich, UK.
  • Given its current magnitude, C/2023 A3 (Tsuchinshan-ATLAS) is visible only through long exposure photography.
  • Go to interactive sky chart

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Distance from Earth

The distance of Comet C/2023 A3 (Tsuchinshan-ATLAS) from Earth is currently 519,736,099.0 kilometers, equivalent to 3.4742212344 Astronomical Units. Light takes 28m 53.653s to travel from Comet C/2023 A3 (Tsuchinshan-ATLAS) and arrive to us.

519,736,099.0
3.4742212344
28m 53.653s

The following chart shows the distance of Comet C/2023 A3 (Tsuchinshan-ATLAS) from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Chart of the distance of Comet C/2023 A3 (Tsuchinshan-ATLAS) from Earth in Astronomical Units (au)

The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of C/2023 A3 (Tsuchinshan-ATLAS) from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach

Between 1 January 2000 and 31 December 2099, the closest approach of Comet C/2023 A3 (Tsuchinshan-ATLAS) to Earth happens on Sun Oct 13 2024 at a distance of 0.472744 Astronomical Units, or 70,721,499 kilometers:

Sun Oct 13 2024
70,721,499
0.472744

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Comet C/2023 A3 (Tsuchinshan-ATLAS), according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Chart of the magnitude of Comet C/2023 A3 (Tsuchinshan-ATLAS) as a function of time

Orbital Elements

The following table lists the orbital elements of Comet C/2023 A3 (Tsuchinshan-ATLAS) at epoch 24 January 2024 00:00 UTC (JD: 2460334.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00012475
Orbit inclination i 139.11502467°
Perihelion distance q 0.39145906 AU
58,561,442 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp 2024-Sep-27 17:38:45
2,460,581.2353 JD
Argument of perihelion peri 308.4872848828°
Longitude of the ascending node node 21.558609111275°
Mean anomaly M -0.0013834563352416°
Mean motion n 0.00000561°/day
2h1>Orbit Visualization
Orbit Diagram of Comet C/2023 A3 (Tsuchinshan-ATLAS)
View Comet C/2023 A3 (Tsuchinshan-ATLAS) in the 3D Solar System Simulator

15 Days Ephemeris

The following table lists the ephemerides of Comet C/2023 A3 (Tsuchinshan-ATLAS) computed for the past and next 7 days, with a 24 hours interval. Apparent celestial coordinates are provided.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2025 May 28 19h 48m 35s +27° 47’ 09” 14.42 Vulpecula
2025 May 29 19h 47m 18s +27° 53’ 13” 14.42 Vulpecula
2025 May 30 19h 46m 01s +27° 59’ 06” 14.43 Cygnus
2025 May 31 19h 44m 41s +28° 04’ 44” 14.44 Cygnus
2025 Jun 01 19h 43m 21s +28° 10’ 09” 14.44 Cygnus
2025 Jun 02 19h 42m 01s +28° 15’ 21” 14.45 Cygnus
2025 Jun 03 19h 40m 39s +28° 20’ 17” 14.46 Cygnus
2025 Jun 04 19h 39m 17s +28° 25’ 00” 14.47 Cygnus
2025 Jun 05 19h 37m 54s +28° 29’ 28” 14.47 Cygnus
2025 Jun 06 19h 36m 30s +28° 33’ 41” 14.48 Cygnus
2025 Jun 07 19h 35m 05s +28° 37’ 40” 14.49 Cygnus
2025 Jun 08 19h 33m 40s +28° 41’ 23” 14.49 Cygnus
2025 Jun 09 19h 32m 14s +28° 44’ 51” 14.50 Cygnus
2025 Jun 10 19h 30m 47s +28° 48’ 04” 14.51 Cygnus

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