Comet 3I/ATLAS (C/2025 N1)
Comet 3I/ATLAS (C/2025 N1) is in the constellation of Sagittarius, at a distance of
Finder Charts
The sky charts below show, at different resolutions, the position of comet 3I/ATLAS (C/2025 N1) in the sky. Click on each chart to access the interactive star map tool.
The following map uses photographic imagery from the Digitized Sky Survey (DSS) to realistically visualize the precise position of comet 3I/ATLAS (C/2025 N1) against the stars in the background. The horizontal size of the map measures 60 arcminutes. Click on the image to access a more detailed full-screen view.
Equatorial Coordinates
Apparent
J2000
Additional Information
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
The following table lists today's rise, transit and set times of comet 3I/ATLAS (C/2025 N1) from Shuozhou, China (all times relative to the local timezone Asia/Shanghai):
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 3I/ATLAS (C/2025 N1) from Earth is currently
The following graph shows the distance of comet 3I/ATLAS (C/2025 N1) from Earth as a function of time. In the chart the distance is measured in Astronomical Units and the data is sampled with an interval of 1 day.
Note: The values in this chart may not be entirely accurate around the time of closest approach for objects passing very close to Earth at high speed (e.g., Near-Earth Objects).
The value of the distance of 3I/ATLAS (C/2025 N1) from Earth is also available as a real time updated value in the live position tracker.
Closest Approach to Earth
In the period between January 1, 2000 and December 31, 2099, the closest approach of comet 3I/ATLAS (C/2025 N1) to Earth will happen on Friday 19 December 2025 at a distance of 1.800328 Astronomical Units, or 269,325,166 kilometers:
Note: the values for the closest approach are computed with a sampling interval of 1 day.
Light Curve
The following chart shows the light curve of comet 3I/ATLAS (C/2025 N1), i.e., its apparent magnitude as a function of time. The curve is calculated using the latest ephemerides provided by JPL Horizons. The magnitude data is sampled with the interval of 2 days. Because of this sampling, inaccuracies may occur for objects that have large variations of brightness over a few days. For comets, large discrepancies can arise between the calculated brightness and the observations due to their highly dynamic, and not always precisely predictable, behavior.
Orbital Elements
The following table lists the orbital elements of comet 3I/ATLAS (C/2025 N1) at epoch June, 30 2025 00:00 UTC (JD: 2460857.5). Source: JPL Small-Body Database
| Element | Symbol | Value |
|---|---|---|
| Orbit eccentricity | e | 6.15150928 |
| Orbit inclination | i | 175.11223850° |
| Perihelion distance | q | 1.35844968 AU 203,221,180 km |
| Aphelion distance | Q | n.a. |
| Semi-major axis | a | n.a. |
| Orbital period | period | n.a. |
| Date of perihelion transit | Tp | October 29, 2025 2,460,977.9792 JD |
| Argument of perihelion | peri | 127.97037690766° |
| Longitude of the ascending node | node | 322.15206403641° |
| Mean anomaly | M | -876.90474244975° |
| Mean motion | n | 7.27847624°/day |
Orbit Visualization
The following chart is a 3D animated visualization of the orbit of comet 3I/ATLAS (C/2025 N1) relative to the other major objects in the Solar System. You can access more advanced features using our 3D Solar System Viewer.
15 Days Ephemeris
The following table lists the ephemerides of comet 3I/ATLAS (C/2025 N1) 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 |
|---|---|---|---|---|
| Jun 26 2025 | 18h 19m 10s | -18° 43’ 37” | 18.24 | Sagittarius |
| Jun 27 2025 | 18h 17m 17s | -18° 43’ 20” | 18.18 | Sagittarius |
| Jun 28 2025 | 18h 15m 21s | -18° 42’ 58” | 18.12 | Sagittarius |
| Jun 29 2025 | 18h 13m 24s | -18° 42’ 33” | 18.06 | Sagittarius |
| Jun 30 2025 | 18h 11m 25s | -18° 42’ 04” | 18.00 | Sagittarius |
| Jul 01 2025 | 18h 09m 23s | -18° 41’ 31” | 17.94 | Sagittarius |
| Jul 02 2025 | 18h 07m 20s | -18° 40’ 54” | 17.88 | Sagittarius |
| Jul 03 2025 | 18h 05m 14s | -18° 40’ 13” | 17.82 | Sagittarius |
| Jul 04 2025 | 18h 03m 07s | -18° 39’ 26” | 17.76 | Sagittarius |
| Jul 05 2025 | 18h 00m 58s | -18° 38’ 35” | 17.69 | Sagittarius |
| Jul 06 2025 | 17h 58m 46s | -18° 37’ 39” | 17.63 | Sagittarius |
| Jul 07 2025 | 17h 56m 33s | -18° 36’ 37” | 17.57 | Sagittarius |
| Jul 08 2025 | 17h 54m 18s | -18° 35’ 29” | 17.51 | Sagittarius |
| Jul 09 2025 | 17h 52m 02s | -18° 34’ 16” | 17.45 | Sagittarius |
Additional Resources on TheSkyLive
- Comet 3I/ATLAS (C/2025 N1): Complete reference information on TheSkyLive.com.
- Where is comet 3I/ATLAS (C/2025 N1)?: Key information on where to find comet 3I/ATLAS (C/2025 N1) in the sky.
- Distance of comet 3I/ATLAS (C/2025 N1) from Earth: Find out how far comet 3I/ATLAS (C/2025 N1) is from Earth right now.
- How Bright is comet 3I/ATLAS (C/2025 N1)?: Current visual brightness (magnitude) and apparent size.
- Rise and Set Times: Rise and set times of comet 3I/ATLAS (C/2025 N1) from your location.
- Interactive Sky Map: Planetarium-style interactive visualization of comet 3I/ATLAS (C/2025 N1)'s position in the sky.
- Live Position Tracker: High precision real time tracker of comet 3I/ATLAS (C/2025 N1)'s position using deep space imagery.
- Ephemeris: 15 days comet 3I/ATLAS (C/2025 N1)'s computed ephemeris.
- Orbital elements: Information about comet 3I/ATLAS (C/2025 N1) orbital parameters.
- Orbit Visualization: 3D interactive visualization showing the orbit of comet 3I/ATLAS (C/2025 N1) with respect to the major Solar System objects.