NGC 688 - Spiral Galaxy in Triangulum
NGC 688 is a Spiral Galaxy in the Triangulum constellation. NGC 688 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere.
Photometric information of NGC 688
The following table lists the magnitude of NGC 688 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 NGC 688.
Apparent size of NGC 688The following table reports NGC 688 apparent angular size. The green area displayed on top of the DSS2 image of NGC 688 is a visual representation of it.
Digitized Sky Survey image of NGC 688
The image below is a photograph of NGC 688 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).
NGC 688 - Spiral Galaxy in Triangulum morphological classification
NGC 688 - Spiral Galaxy in Triangulum is classified as Spiral (SAb) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of NGC 688 - Spiral Galaxy in Triangulum in the Hubble de Vaucouleurs sequence.
Celestial coordinates and finder chart of NGC 688
Celestial coordinates for the J2000 equinox of NGC 688 are provided in the following table:
The simplified sky charts below show the position of NGC 688 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.