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public  Greenwich, UK Greenwich, UK  ⓘ
Timezone: Europe/London
Sunrise: 5:03 
Transit: 12:56 
Sunset: 20:50
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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 Triangulum
All Constellations »  Triangulum »  Deep Sky Objects » 

NGC 684 - Spiral Galaxy in Triangulum

Above the horizon.  Rise: 2:19 | Tran: 11:02 | Set: 19:45
Alt: 34.81°   Az: 87.83°   Direction: East

NGC 684 is a Spiral Galaxy in the Triangulum constellation. NGC 684 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere. Given its B magnitude of 13.2, NGC 684 is visible with the help of a telescope having an aperture of 10 inches (250mm) or more.

The image below is a photograph of NGC 684 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 NGC 684 - Spiral Galaxy in Triangulum star
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DSS2 image of NGC 684 in the Red band. The green region on the image is a representation of the major (2.95 arcmin) and minor (0.82 arcmin) axes of the object's apparent size.

Celestial Coordinates

Apparent

01h 51m 40s
+27° 46’ 14”
19h 27m 55s
21h 19m 35s

J2000

01h 50m 13s
+27° 38’ 44”

Finder Chart

The simplified sky charts below show the position of NGC 684 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 NGC 684 - Spiral Galaxy in Triangulum.

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Finder chart for NGC 684 - Spiral Galaxy in Triangulum.

Photometric Information

The following table lists the magnitude of NGC 684 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).

13.2
9.88
9.09
8.79

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

The surface brightess reported below is an indication of the brightness per unit of angular area of NGC 684.

23.55 mag/arcsec2

Apparent Size

The following table reports NGC 684 apparent angular size. The green area displayed on top of the DSS2 image of NGC 684 is a visual representation of it.
2.95 arcmin
0.82 arcmin
90°

Morphological Classification

NGC 684 - Spiral Galaxy in Triangulum is classified as Spiral (SAb) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of NGC 684 - Spiral Galaxy in Triangulum in the Hubble de Vaucouleurs sequence.

NGC 684 - Spiral Galaxy in Triangulum
Visualization of the morphological classification of NGC 684 - Spiral Galaxy in Triangulum, Spiral (SAb).
Credits for the background image: Antonio Ciccolella / M. De Leo / CC BY

Rise and Set Times

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

Today's NGC 684 - Spiral Galaxy in Triangulum rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 62.2°
Max altitude: 66.3°
Azimuth: 297.8°