NGC 1931 - Star Cluster + Nebula in Auriga
NGC 1931 is a Star Cluster + Nebula in the Auriga constellation. NGC 1931 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere.
Photometric information of NGC 1931
The following table lists the magnitude of NGC 1931 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).
For more information about photometry in astronomy, check the photometric system article on Wikipedia.
Apparent size of NGC 1931The following table reports NGC 1931 apparent angular size. The green area displayed on top of the DSS2 image of NGC 1931 is a visual representation of it.
Digitized Sky Survey image of NGC 1931
The image below is a photograph of NGC 1931 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 0.5x0.5 degrees (30x30 arcmins).
Celestial coordinates and finder chart of NGC 1931
Celestial coordinates for the J2000 equinox of NGC 1931 are provided in the following table:
The simplified sky charts below show the position of NGC 1931 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.