Comet C/2025 R2 (SWAN)
Comet C/2025 R2 (SWAN) is in the constellation of Aquarius, at a distance of
Finder Charts
The sky charts below show, at different resolutions, the position of comet C/2025 R2 (SWAN) 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 C/2025 R2 (SWAN) 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 C/2025 R2 (SWAN) from Greenwich, UK (all times relative to the local timezone Europe/London):
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/2025 R2 (SWAN) from Earth is currently
The following graph shows the distance of comet C/2025 R2 (SWAN) 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 C/2025 R2 (SWAN) 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 C/2025 R2 (SWAN) to Earth happened on Monday 20 October 2025 at a distance of 0.261140 Astronomical Units, or 39,066,052 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 C/2025 R2 (SWAN), 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 C/2025 R2 (SWAN) at epoch September, 16 2025 00:00 UTC (JD: 2460935.5). Source: JPL Small-Body Database
| Element | Symbol | Value |
|---|---|---|
| Orbit eccentricity | e | 0.99330818 |
| Orbit inclination | i | 4.47362734° |
| Perihelion distance | q | 0.50404843 AU 75,404,573 km |
| Aphelion distance | Q |
150.14211646 AU 22,460,940,970 km |
| Semi-major axis | a |
75.32308245 AU 11,268,172,771 km |
| Orbital period | period |
653.7329 years 238,775.9345 days |
| Date of perihelion transit | Tp | September 12, 2025 2,460,931.3294 JD |
| Next perihelion transit | June 12, 2679 2,699,707.2639 JD |
|
| Argument of perihelion | peri | 308.31474201277° |
| Longitude of the ascending node | node | 335.34811311174° |
| Mean anomaly | M | 0.0062879193042896° |
| Mean motion | n | 0.00150769°/day |
Orbit Visualization
The following chart is a 3D animated visualization of the orbit of comet C/2025 R2 (SWAN) 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 C/2025 R2 (SWAN) 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 |
|---|---|---|---|---|
| Oct 28 2025 | 21h 09m 04s | -04° 50’ 04” | 9.75 | Aquarius |
| Oct 29 2025 | 21h 21m 48s | -03° 55’ 04” | 9.89 | Aquarius |
| Oct 30 2025 | 21h 33m 37s | -03° 03’ 20” | 10.03 | Aquarius |
| Oct 31 2025 | 21h 44m 35s | -02° 14’ 53” | 10.18 | Aquarius |
| Nov 01 2025 | 21h 54m 43s | -01° 29’ 43” | 10.32 | Aquarius |
| Nov 02 2025 | 22h 04m 07s | -00° 47’ 40” | 10.46 | Aquarius |
| Nov 03 2025 | 22h 12m 50s | -00° 08’ 37” | 10.61 | Aquarius |
| Nov 04 2025 | 22h 20m 55s | +00° 27’ 38” | 10.75 | Aquarius |
| Nov 05 2025 | 22h 28m 26s | +01° 01’ 18” | 10.89 | Aquarius |
| Nov 06 2025 | 22h 35m 26s | +01° 32’ 37” | 11.03 | Aquarius |
| Nov 07 2025 | 22h 41m 59s | +02° 01’ 45” | 11.16 | Aquarius |
| Nov 08 2025 | 22h 48m 05s | +02° 28’ 54” | 11.30 | Aquarius |
| Nov 09 2025 | 22h 53m 48s | +02° 54’ 14” | 11.43 | Pisces |
| Nov 10 2025 | 22h 59m 11s | +03° 17’ 56” | 11.56 | Pisces |
Additional Resources on TheSkyLive
- Comet C/2025 R2 (SWAN): Complete reference information on TheSkyLive.com.
- Where is comet C/2025 R2 (SWAN)?: Key information on where to find comet C/2025 R2 (SWAN) in the sky.
- Distance of comet C/2025 R2 (SWAN) from Earth: Find out how far comet C/2025 R2 (SWAN) is from Earth right now.
- How Bright is comet C/2025 R2 (SWAN)?: Current visual brightness (magnitude) and apparent size.
- Rise and Set Times: Rise and set times of comet C/2025 R2 (SWAN) from your location.
- Interactive Sky Map: Planetarium-style interactive visualization of comet C/2025 R2 (SWAN)'s position in the sky.
- Live Position Tracker: High precision real time tracker of comet C/2025 R2 (SWAN)'s position using deep space imagery.
- Ephemeris: 15 days comet C/2025 R2 (SWAN)'s computed ephemeris.
- Orbital elements: Information about comet C/2025 R2 (SWAN) orbital parameters.
- Orbit Visualization: 3D interactive visualization showing the orbit of comet C/2025 R2 (SWAN) with respect to the major Solar System objects.