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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 4:46 
Transit: 13:03 
Sunset: 21:19
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Comets » 

Comet C/2025 A6 (Lemmon)

Above the horizon.  Rise: 4:46 | Tran: 13:18 | Set: 21:51
Alt: 31.51°   Az: 86.02°   Direction: East

Comet C/2025 A6 (Lemmon) is in the constellation of Gemini, at a distance of 516,633,882.0 kilometers from Earth. The current Right Ascension is 06h 46m 10s and the Declination is +26° 28’ 25” (apparent coordinates). The estimated magnitude of comet C/2025 A6 (Lemmon), computed using JPL Horizons's data, is 19.50).

Finder Charts

The sky charts below show, at different resolutions, the position of comet C/2025 A6 (Lemmon) in the sky. Click on each chart to access the interactive star map tool.

Star map showing the position of comet C/2025 A6 (Lemmon) in the constellation of Gemini on F, d Y. Field of view: 50x30 degrees. View interactive star map.
Star map showing the position of comet C/2025 A6 (Lemmon) in the constellation of Gemini on F, d Y. Field of view: 15x9 degrees. View in interactive star map.

The following map uses photographic imagery from the Digitized Sky Survey (DSS) to realistically visualize the precise position of comet C/2025 A6 (Lemmon) 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.

C/2025 A6 (Lemmon)
RA: 06h 44m 35s
Dec: +26° 30’ 05”
Simplified high-resolution deep sky chart showing the current position of comet C/2025 A6 (Lemmon). Field of view: 60 x 40 arcminutes. Go to the dedicated page

Equatorial Coordinates

Apparent

06h 46m 10s
+26° 28’ 25”
19h 12m 42s
01h 58m 53s

J2000

06h 44m 35s
+26° 30’ 05”

Additional Information

Gemini
n/a
n/a
n/a
n/a
19.50

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 A6 (Lemmon) from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 63.5°
Max altitude: 65.0°
Azimuth: 296.5°

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 A6 (Lemmon) from Earth is currently 516,633,882.0 kilometers, equivalent to 3.4534841945 Astronomical Units. Light takes 28m 43.305s to travel from comet C/2025 A6 (Lemmon) and arrive to us.

516,633,882.0
3.4534841945
28m 43.305s

The following graph shows the distance of comet C/2025 A6 (Lemmon) 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.

Chart of the distance of comet C/2025 A6 (Lemmon) from Earth in Astronomical Units (au)
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 A6 (Lemmon) 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 A6 (Lemmon) to Earth will happen on Tuesday 21 October 2025 at a distance of 0.596130 Astronomical Units, or 89,179,743 kilometers:

Tuesday 21 October 2025
89,179,743
0.596130

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 A6 (Lemmon), 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.

Chart of the magnitude of comet C/2025 A6 (Lemmon) as a function of time

Orbital Elements

The following table lists the orbital elements of comet C/2025 A6 (Lemmon) at epoch January, 21 2025 00:00 UTC (JD: 2460697.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.99575642
Orbit inclination i 143.62971264°
Perihelion distance q 0.52911433 AU
79,154,378 km
Aphelion distance Q 248.84229536 AU
37,226,277,601 km
Semi-major axis a 124.68570485 AU
18,652,715,989 km
Orbital period period 1,392.3012 years
508,538.0155 days
Date of perihelion transit Tp November 8, 2025
2,460,987.9877 JD
Argument of perihelion peri 132.99917370342°
Longitude of the ascending node node 108.09833729353°
Mean anomaly M 359.7943603451°
Mean motion n 0.00070791°/day

Orbit Visualization

The following chart is a 3D animated visualization of the orbit of comet C/2025 A6 (Lemmon) 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 A6 (Lemmon) 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 21 2025 06h 40m 26s +26° 07’ 09” 19.68 Gemini
Jun 22 2025 06h 41m 11s +26° 10’ 00” 19.66 Gemini
Jun 23 2025 06h 41m 58s +26° 12’ 54” 19.63 Gemini
Jun 24 2025 06h 42m 45s +26° 15’ 47” 19.61 Gemini
Jun 25 2025 06h 43m 32s +26° 18’ 40” 19.58 Gemini
Jun 26 2025 06h 44m 19s +26° 21’ 36” 19.56 Gemini
Jun 27 2025 06h 45m 07s +26° 24’ 32” 19.53 Gemini
Jun 28 2025 06h 45m 55s +26° 27’ 29” 19.51 Gemini
Jun 29 2025 06h 46m 44s +26° 30’ 27” 19.48 Gemini
Jun 30 2025 06h 47m 33s +26° 33’ 27” 19.45 Gemini
Jul 01 2025 06h 48m 23s +26° 36’ 28” 19.42 Gemini
Jul 02 2025 06h 49m 13s +26° 39’ 30” 19.40 Gemini
Jul 03 2025 06h 50m 04s +26° 42’ 34” 19.37 Gemini
Jul 04 2025 06h 50m 55s +26° 45’ 39” 19.34 Gemini

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