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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 4:57 
Transit: 13:04 
Sunset: 21:10
sunny   (Daytime)   What's Visible Now?
All Constellations »  Sculptor »  Deep Sky Objects » 

NGC 639 - Spiral Galaxy in Sculptor

Below the horizon.  Rise: 4:22 | Tran: 7:16 | Set: 10:10
Altitude: -56.4°   Azimuth: 296.4°   Direction: West-North-West

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.

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).

Image of NGC 639 - Spiral Galaxy in Sculptor star
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DSS2 image of NGC 639 in the Red band. The green region on the image is a representation of the major (1.04 arcmin) and minor (0.3 arcmin) axes of the object's apparent size.

Key facts about NGC 639

NGC 639
Galaxy
Sculptor

NGC 639 is below the horizon from Greenwich, UK.

Altitude: -56.4°
Azimuth: 296.4°
Direction: West-North-West

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.

Available Resources for NGC 639 - Spiral Galaxy in Sculptor

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).

14.67
12.32
11.61
11.32

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.

22.94 mag/arcsec2

Apparent size of NGC 639

The 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.
1.04 arcmin
0.3 arcmin
32°

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.

NGC 639 - Spiral Galaxy in Sculptor
Visualization of the morphological classification of NGC 639 - Spiral Galaxy in Sculptor, Spiral (SAa).
Credits for the background image: Antonio Ciccolella / M. De Leo / CC BY

Celestial coordinates and finder chart of NGC 639

Celestial coordinates for the J2000 equinox of NGC 639 are provided in the following table:

01h 38m 58s
-29° 55’ 31”

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°.

Finder chart NGC 639 - Spiral Galaxy in Sculptor star
Simplified finder chart for NGC 639 - Spiral Galaxy in Sculptor.

Finder chart NGC 639 - Spiral Galaxy in Sculptor star
Simplified finder chart for NGC 639 - Spiral Galaxy in Sculptor.

Rise and set times of NGC 639 from your location

Location: Greenwich, UK
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's NGC 639 - Spiral Galaxy in Sculptor rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 119.9°
Max altitude: 8.6°
Azimuth: 240.1°