Comet C/2023 A3 (Tsuchinshan-ATLAS) | TheSkyLive (2024)


Below the horizon.Rise:10:48|Tran:16:57|Set:23:06

Altitude: -24.3°Azimuth: 50.3°Direction: North-East

Comet C/2023 A3 (Tsuchinshan-ATLAS) is currently in the constellation of Leo,at a distance of 302,035,267 kilometers from Earth.

The current Right Ascension of Comet C/2023 A3 (Tsuchinshan-ATLAS) is 11h 10m 13s and the Declination is +02° 20’ 13” (topocentric coordinatescomputed for Greenwich, UK).

The latest observed magnitude of Comet C/2023 A3 (Tsuchinshan-ATLAS) is 9.7 (data provided by COBS)

Map showing Comet C/2023 A3 (Tsuchinshan-ATLAS) in Leo on July, 09 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 10m 13s

+02° 20’ 13”






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 Magnitudecomes from the JPL Horizons ephemerides service and, in the case of comets, might beinaccurate given the highly dynamic and unpredictablebehavior of these objects. When available, please refer to the Observed Magnitude value and consider the Predicted Magnitude as adirectional indication. We acknowledge with thanks the comet observations from the COBS Comet ObservationDatabase contributed by observers worldwide and used in this table toreport recent comet observations.

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

Azimuth: 87.7°

Max altitude: 40.8°

Azimuth: 272.3°

  • C/2023 A3 (Tsuchinshan-ATLAS) isbelow the horizon from Greenwich, UK.
  • 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
  • Position and finder charts (see also Where is Comet C/2023 A3 (Tsuchinshan-ATLAS)?)
  • Distance from Earth (see also How far is Comet C/2023 A3 (Tsuchinshan-ATLAS) from Earth?)
  • When does Comet C/2023 A3 (Tsuchinshan-ATLAS) rise and set?
  • Brightness (see also How bright is Comet C/2023 A3 (Tsuchinshan-ATLAS)?)
  • Orbital elements. Detailed informationabout Comet C/2023 A3 (Tsuchinshan-ATLAS) orbital parameters.
  • Interactive orbit visualization. 3dvisualization showing the orbit of Comet C/2023 A3 (Tsuchinshan-ATLAS) with respect to the major Solar System objects.
  • 15 days ephemerides. Table showing celestial coordinates and magnitude of Comet C/2023 A3 (Tsuchinshan-ATLAS) for the past and next 7 days.
  • Interactive sky chart. An online planetarium application that shows where to locate Comet C/2023 A3 (Tsuchinshan-ATLAS)in the sky from your location.
  • Live position tracker. A high precision sky chart that uses real deep sky imagery to help locate Comet C/2023 A3 (Tsuchinshan-ATLAS)with your telescope or on your astrophotographies.

Sky map showing Comet C/2023 A3 (Tsuchinshan-ATLAS) in Leo on July, 09 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 10m 13s
Dec: +02° 20’ 13”

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.

The distance of Comet C/2023 A3 (Tsuchinshan-ATLAS) from Earth is currently 302,035,267 kilometers,equivalent to 2.018981 Astronomical Units.Light takes16 minutes and 47.4812 seconds to travel from Comet C/2023 A3 (Tsuchinshan-ATLAS) and arrive to us.



16 minutes and 47.4812 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 theLive Position and Data Tracker.

Between 1 January 2000 and 31 December 2099,the closest approach ofComet C/2023 A3 (Tsuchinshan-ATLAS) to Earth happens on Sun Oct 13 2024 at a distance of 0.476126 Astronomical Units, or71,227,371 kilometers:

Sun Oct 13 2024



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

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 inaccuraciesfor objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepanciesbetween 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

The following table lists the orbital elements of Comet C/2023 A3 (Tsuchinshan-ATLAS)at epoch17 October 2023 00:00 UTC (JD: 2460235.5).Source: JPL Small-Body Database

Orbit eccentricitye1.00015108
Orbit inclinationi139.11961923°
Perihelion distanceq0.39146947 AU
58,562,999 km
Aphelion distanceQn.a.
Semi-major axisan.a.
Orbital periodperiodn.a.
Date of perihelion transitTp2024-Sep-27 17:18:36
2,460,581.2213 JD
Argument of perihelionperi308.48269677916°
Longitude of the ascending nodenode21.556440041516°
Mean anomalyM-0.0025832899218413°
Mean motionn0.00000747°/day

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

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.

DateRight AscensionR.A.DeclinationDec.MagnitudeMagConstellation
2024 Jul 0211h 16m 37s+02° 41’ 57”10.31Leo
2024 Jul 0311h 15m 39s+02° 39’ 25”10.28Leo
2024 Jul 0411h 14m 44s+02° 36’ 44”10.25Leo
2024 Jul 0511h 13m 49s+02° 33’ 56”10.23Leo
2024 Jul 0611h 12m 56s+02° 30’ 59”10.20Leo
2024 Jul 0711h 12m 05s+02° 27’ 52”10.17Leo
2024 Jul 0811h 11m 15s+02° 24’ 38”10.14Leo
2024 Jul 0911h 10m 27s+02° 21’ 16”10.11Leo
2024 Jul 1011h 09m 39s+02° 17’ 48”10.08Leo
2024 Jul 1111h 08m 54s+02° 14’ 09”10.05Leo
2024 Jul 1211h 08m 11s+02° 10’ 26”10.02Leo
2024 Jul 1311h 07m 27s+02° 06’ 33”9.99Leo
2024 Jul 1411h 06m 46s+02° 02’ 32”9.96Leo
2024 Jul 1511h 06m 06s+01° 58’ 27”9.92Leo

Compute the position of Comet C/2023 A3 (Tsuchinshan-ATLAS)for any date and time between 1 January 2000and 31 December 2099and display the results on an interactive star map.

Comet C/2023 A3 (Tsuchinshan-ATLAS) | TheSkyLive (2024)
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