NGC 639 - Spiral Galaxy in Sculptor
NGC 639 is a Spiral Galaxy in the Sculptor constellation. NGC 639 is situated south of the celestial equator and, as such, it is more easily visible from the southern hemisphere.
See also NGC 639 rise and set times.
Given its B magnitude of 14.67, NGC 639 is visible with the help of a telescope having an aperture of 20 inches (500mm) or more.
Photometric information of NGC 639
The following table lists the magnitude of NGC 639 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 639.
Apparent size of NGC 639The following table reports NGC 639 apparent angular size. The green area displayed on top of the DSS2 image of NGC 639 is a visual representation of it.
Digitized Sky Survey image of NGC 639
The image below is a photograph of NGC 639 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 639 - Spiral Galaxy in Sculptor morphological classification
NGC 639 - Spiral Galaxy in Sculptor is classified as Spiral (SAa) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of NGC 639 - Spiral Galaxy in Sculptor in the Hubble de Vaucouleurs sequence.
Celestial coordinates and finder chart of NGC 639
Celestial coordinates for the J2000 equinox of NGC 639 are provided in the following table:
The simplified sky charts below show the position of NGC 639 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.
Rise ans set times of NGC 639 from your location
Today's NGC 639 - Spiral Galaxy in Sculptor rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):