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public LocationGreenwich, UK
Sunrise: 4:57 
Transit: 13:04 
Sunset: 21:10
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Comets » 

Comet C/2023 A3 (Tsuchinshan-ATLAS)

Above the horizon.  Rise: 10:34 | Tran: 16:43 | Set: 22:52
Altitude: 37.9°   Azimuth: 154.7°   Direction: South-South-East

Comet C/2023 A3 (Tsuchinshan-ATLAS) is currently in the constellation of Leo, at a distance of 303,850,745 kilometers from Earth.

The current Right Ascension of Comet C/2023 A3 (Tsuchinshan-ATLAS) is 11h 07m 45s and the Declination is +02° 08’ 03” (topocentric coordinates computed for Greenwich, UK).

The latest observed magnitude of Comet C/2023 A3 (Tsuchinshan-ATLAS) is 10.4 (data provided by COBS)

Finder chart of C/2023 A3 (Tsuchinshan-ATLAS) in Leo on July,12 2024
Map showing Comet C/2023 A3 (Tsuchinshan-ATLAS) in Leo on July, 12 2024. Field of view: 50x30 degrees
View interactive star map

Comet C/2023 A3 (Tsuchinshan-ATLAS) was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) on 22 February 2023 and it was also independently observed few weeks before in January 2023 at the Tsuchinshan Chinese Observatory (Purple Mountain Observatory of the Chinese Academy of Sciences). The official designation includes both Tsuchinshan and ATLAS due to these independent observations. Its retrograde orbit, meaning it moves in the opposite direction to most major solar system objects, is parabolic-like with a perihelion distance of 0.39 astronomical units (AU). Comet C/2023 A3 (Tsuchinshan-ATLAS) is notable and actively observed because, based on current estimations, it is could become bright enough to be visible to the naked eye during its perihelion passage between September and October 2024.

11h 07m 45s
+02° 08’ 03”

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.

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: 87.9°
Max altitude: 40.7°
Azimuth: 272.1°
  • C/2023 A3 (Tsuchinshan-ATLAS) is above the horizon from Greenwich, UK.
  • Right now it is placed in the South-South-East direction at an altitude of 38° above the horizon.
  • Given its current magnitude, C/2023 A3 (Tsuchinshan-ATLAS) is visible with the help of a binocular with a 80mm aperture or a small telescope.
  • 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.

Additional Resources

Comet C/2023 A3 (Tsuchinshan-ATLAS) Position and Finder Charts

Finder chart of C/2023 A3 (Tsuchinshan-ATLAS)
Sky map showing Comet C/2023 A3 (Tsuchinshan-ATLAS) in Leo on July, 12 2024. Field of view: 10x6 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: 11h 07m 45s
Dec: +02° 08’ 03”
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.

Comet C/2023 A3 (Tsuchinshan-ATLAS) Distance from Earth

The distance of Comet C/2023 A3 (Tsuchinshan-ATLAS) from Earth is currently 303,850,745 kilometers, equivalent to 2.031117 Astronomical Units. Light takes 16 minutes and 53.5370 seconds to travel from Comet C/2023 A3 (Tsuchinshan-ATLAS) and arrive to us.

16 minutes and 53.5370 seconds

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 of Comet C/2023 A3 (Tsuchinshan-ATLAS) to Earth

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 0.476126 Astronomical Units, or 71,227,371 kilometers:

Sun Oct 13 2024

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

Comet C/2023 A3 (Tsuchinshan-ATLAS) Brightness and 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

Comet C/2023 A3 (Tsuchinshan-ATLAS) Orbital Elements

The following table lists the orbital elements of Comet C/2023 A3 (Tsuchinshan-ATLAS) at epoch 17 October 2023 00:00 UTC (JD: 2460235.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.00015108
Orbit inclination i 139.11961923°
Perihelion distance q 0.39146947 AU
58,562,999 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 17:18:36
2,460,581.2213 JD
Argument of perihelion peri 308.48269677916°
Longitude of the ascending node node 21.556440041516°
Mean anomaly M -0.0025832899218413°
Mean motion n 0.00000747°/day

Visualization of Comet C/2023 A3 (Tsuchinshan-ATLAS) Orbit

Orbit Diagram of Comet C/2023 A3 (Tsuchinshan-ATLAS)
View Comet C/2023 A3 (Tsuchinshan-ATLAS) in the 3D Solar System Simulator

Comet C/2023 A3 (Tsuchinshan-ATLAS) 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.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2024 Jul 05 11h 13m 49s +02° 33’ 56” 10.23 Leo
2024 Jul 06 11h 12m 56s +02° 30’ 59” 10.20 Leo
2024 Jul 07 11h 12m 05s +02° 27’ 52” 10.17 Leo
2024 Jul 08 11h 11m 15s +02° 24’ 38” 10.14 Leo
2024 Jul 09 11h 10m 27s +02° 21’ 16” 10.11 Leo
2024 Jul 10 11h 09m 39s +02° 17’ 48” 10.08 Leo
2024 Jul 11 11h 08m 54s +02° 14’ 09” 10.05 Leo
2024 Jul 12 11h 08m 11s +02° 10’ 26” 10.02 Leo
2024 Jul 13 11h 07m 27s +02° 06’ 33” 9.99 Leo
2024 Jul 14 11h 06m 46s +02° 02’ 32” 9.96 Leo
2024 Jul 15 11h 06m 06s +01° 58’ 27” 9.92 Leo
2024 Jul 16 11h 05m 26s +01° 54’ 12” 9.89 Leo
2024 Jul 17 11h 04m 49s +01° 49’ 51” 9.86 Leo
2024 Jul 18 11h 04m 12s +01° 45’ 24” 9.82 Leo