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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 804 - Lenticular Galaxy in Triangulum

Above the horizon.  Rise: 2:03 | Tran: 11:16 | Set: 20:28
Alt: 8.35°   Az: 49.44°   Direction: North-East

NGC 804 is a Lenticular Galaxy in the Triangulum constellation. NGC 804 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere. Given its B magnitude of 14.7, NGC 804 is visible with the help of a telescope having an aperture of 20 inches (500mm) or more.

The image below is a photograph of NGC 804 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 804 - Lenticular Galaxy in Triangulum star
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DSS2 image of NGC 804 in the Red band. The green region on the image is a representation of the major (1.27 arcmin) and minor (0.33 arcmin) axes of the object's apparent size.

Celestial Coordinates

Apparent

02h 05m 30s
+30° 57’ 13”
16h 04m 53s
18h 10m 23s

J2000

02h 04m 01s
+30° 49’ 58”

Finder Chart

The simplified sky charts below show the position of NGC 804 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 804 - Lenticular Galaxy in Triangulum.

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Finder chart for NGC 804 - Lenticular Galaxy in Triangulum.

Photometric Information

The following table lists the magnitude of NGC 804 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).

14.7
11.35
10.68
10.41

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 804.

23.79 mag/arcsec2

Apparent Size

The following table reports NGC 804 apparent angular size. The green area displayed on top of the DSS2 image of NGC 804 is a visual representation of it.
1.27 arcmin
0.33 arcmin
8°

Morphological Classification

NGC 804 - Lenticular Galaxy in Triangulum is classified as Lenticular (S0) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of NGC 804 - Lenticular Galaxy in Triangulum in the Hubble de Vaucouleurs sequence.

NGC 804 - Lenticular Galaxy in Triangulum
Visualization of the morphological classification of NGC 804 - Lenticular Galaxy in Triangulum, Lenticular (S0).
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 804 - Lenticular Galaxy in Triangulum rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 59.0°
Max altitude: 69.5°
Azimuth: 301.0°