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public  Greenwich, UK Greenwich, UK  ⓘ
Timezone: Europe/London
Sunrise: 5:06 
Transit: 12:56 
Sunset: 20:47
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In Evidence

New Comet C/2025 J1 (Borisov) Discovered in May 2025
Detailed information about the discovery of Comet C/2025 J1 (Borisov) and pointers to useful resources to track and observe it. Read more...

Other deep sky objects in Gemini
All Constellations »  Gemini »  Deep Sky Objects » 

IC 2157 - Open Cluster in Gemini

Above the horizon.  Rise: 7:10 | Tran: 15:24 | Set: 23:38
Alt: 40.41°   Az: 257.91°   Direction: West-South-West

IC 2157 is a Open Cluster in the Gemini constellation. IC 2157 is situated close to the celestial equator and, as such, it is at least partly visible from both hemispheres in certain times of the year. Given its visual magnitude of 8.4, IC 2157 is visible with the help of a binocular with a 40-50mm aperture or a small telescope.

The image below is a photograph of IC 2157 from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5000x0.5000 degrees (30.00x30.00 arcmins).

Image of IC 2157 - Open Cluster in Gemini star
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DSS2 image of IC 2157 in the Red band. The green region on the image is a representation of the major (2.7 arcmin) and minor (2.7 arcmin) axes of the object's apparent size.

Celestial Coordinates

Apparent

06h 06m 21s
+24° 04’ 03”
03h 38m 32s
09h 44m 53s

J2000

06h 04m 48s
+24° 04’ 15”

Finder Chart

The simplified sky charts below show the position of IC 2157 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.

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Finder chart for IC 2157 - Open Cluster in Gemini.

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Finder chart for IC 2157 - Open Cluster in Gemini.

Photometric Information

The following table lists the magnitude of IC 2157 in different bands of the electomagnetic spectrum (when available), from the B band (445nm wavelength, corresponding to the Blue color), to the V band ( 551nm wavelength, corresponding to Green/Yellow color), to the J, H, K bands (corresponding to 1220nm, 1630nm, 2190nm wavelengths respectively, which are colors not visible to the human eye).

8.91
8.4

For more information about photometry in astronomy, check the photometric system article on Wikipedia.

Apparent Size

The following table reports IC 2157 apparent angular size. The green area displayed on top of the DSS2 image of IC 2157 is a visual representation of it.
2.7 arcmin
2.7 arcmin

Rise and Set Times

Location: Greenwich, UK
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's IC 2157 - Open Cluster in Gemini rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 65.9°
Max altitude: 62.6°
Azimuth: 294.1°