IC 138 - Intermediate Spiral Galaxy in Cetus
IC 138 is a Intermediate Spiral Galaxy in the Cetus constellation. IC 138 is situated close to the celestial equator and, as such, it is at least partly visible from both hemispheres in certain times of the year.
Photometric information of IC 138
The following table lists the magnitude of IC 138 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 138.
Apparent size of IC 138The following table reports IC 138 apparent angular size. The green area displayed on top of the DSS2 image of IC 138 is a visual representation of it.
Digitized Sky Survey image of IC 138
The image below is a photograph of IC 138 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 138 - Intermediate Spiral Galaxy in Cetus morphological classification
IC 138 - Intermediate Spiral Galaxy in Cetus is classified as Intermediate Spiral (SABc) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of IC 138 - Intermediate Spiral Galaxy in Cetus in the Hubble de Vaucouleurs sequence.
Celestial coordinates and finder chart of IC 138
Celestial coordinates for the J2000 equinox of IC 138 are provided in the following table:
The simplified sky charts below show the position of IC 138 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.