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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:14 
Transit: 13:06 
Sunset: 20:58
wb_twilight   (Nautical Twilight)   What's Visible Now?
All Constellations »  Ursa Major »  Deep Sky Objects » 

NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major

Above the horizon.  Circumpolar today
Alt: 13.49°   Az: 355.92°   Direction: North

NGC 3931 is a Elliptical/Spiral Galaxy in the Ursa Major constellation. NGC 3931 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere. Given its B magnitude of 14.6, NGC 3931 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 3931 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 3931 - Elliptical/Spiral Galaxy in Ursa Major star
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DSS2 image of NGC 3931 in the Red band. The green region on the image is a representation of the major (1.13 arcmin) and minor (0.88 arcmin) axes of the object's apparent size.

Celestial Coordinates

Apparent

11h 52m 30s
+51° 51’ 51”
11h 34m 17s
23h 26m 47s

J2000

11h 51m 12s
+52° 00’ 03”

Finder Chart

The simplified sky charts below show the position of NGC 3931 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.

Finder chart NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major star
Simplified finder chart for NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major.

Finder chart NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major star
Simplified finder chart for NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major.

Photometric Information

The following table lists the magnitude of NGC 3931 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).

14.6
11.44
10.8
10.6

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 3931.

23.28 mag/arcsec2

Apparent Size

The following table reports NGC 3931 apparent angular size. The green area displayed on top of the DSS2 image of NGC 3931 is a visual representation of it.
1.13 arcmin
0.88 arcmin
157°

Morphological Classification

NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major is classified as Elliptical/Spiral (E-S0) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major in the Hubble de Vaucouleurs sequence.

NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major
Visualization of the morphological classification of NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major, Elliptical/Spiral (E-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

NGC 3931 - Elliptical/Spiral Galaxy in Ursa Major is circumpolar and transits at 15:41 UTC (altitude: 89.6°)