IC 491 - Spiral Galaxy in Cancer
IC 491 is a Spiral Galaxy in the Cancer constellation. IC 491 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere.
Photometric information of IC 491
The following table lists the magnitude of IC 491 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.
The surface brightess reported below is an indication of the brightness per unit of angular area of IC 491.
Apparent size of IC 491The following table reports IC 491 apparent angular size. The green area displayed on top of the DSS2 image of IC 491 is a visual representation of it.
Digitized Sky Survey image of IC 491
The image below is a photograph of IC 491 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).
IC 491 - Spiral Galaxy in Cancer morphological classification
IC 491 - Spiral Galaxy in Cancer is classified as Spiral (SAc) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of IC 491 - Spiral Galaxy in Cancer in the Hubble de Vaucouleurs sequence.
Celestial coordinates and finder chart of IC 491
Celestial coordinates for the J2000 equinox of IC 491 are provided in the following table:
The simplified sky charts below show the position of IC 491 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.