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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:15 
Transit: 13:06 
Sunset: 20:56
sunny   (Daytime)   What's Visible Now?
All Constellations »  Sculptor »  Deep Sky Objects » 

NGC 491A - Spiral Galaxy in Sculptor

Below the horizon.  Rise: 3:56 | Tran: 6:07 | Set: 8:18
Alt: -1.13°   Az: 209.77°   Direction: South-South-West

NGC 491A is a Spiral Galaxy in the Sculptor constellation. NGC 491A is situated south of the celestial equator and, as such, it is more easily visible from the southern hemisphere. Given its B magnitude of 14.32, NGC 491A is visible with the help of a telescope having an aperture of 14 inches (350mm) or more.

The image below is a photograph of NGC 491A 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 0.5000x0.5000 degrees (30.00x30.00 arcmins).

Image of NGC 491A - Spiral Galaxy in Sculptor star
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DSS2 image of NGC 491A in the Red band. The green region on the image is a representation of the major (1.88 arcmin) and minor (0.85 arcmin) axes of the object's apparent size.

Celestial Coordinates

Apparent

01h 21m 12s
-33° 46’ 15”
02h 26m 41s
03h 47m 54s

J2000

01h 20m 04s
-33° 53’ 57”

Finder Chart

The simplified sky charts below show the position of NGC 491A 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 491A - Spiral Galaxy in Sculptor star
Simplified finder chart for NGC 491A - Spiral Galaxy in Sculptor.

Finder chart NGC 491A - Spiral Galaxy in Sculptor star
Simplified finder chart for NGC 491A - Spiral Galaxy in Sculptor.

Photometric Information

The following table lists the magnitude of NGC 491A 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).

14.32
13.05
12.92
12.28

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 491A.

23.72 mag/arcsec2

Apparent Size

The following table reports NGC 491A apparent angular size. The green area displayed on top of the DSS2 image of NGC 491A is a visual representation of it.
1.88 arcmin
0.85 arcmin
97°

Morphological Classification

NGC 491A - Spiral Galaxy in Sculptor is classified as Spiral (SAcd) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of NGC 491A - Spiral Galaxy in Sculptor in the Hubble de Vaucouleurs sequence.

NGC 491A - Spiral Galaxy in Sculptor
Visualization of the morphological classification of NGC 491A - Spiral Galaxy in Sculptor, Spiral (SAcd).
Credits for the background image: Antonio Ciccolella / M. De Leo / CC BY

Rise and Set Times

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

Today's NGC 491A - 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: 123.8°
Max altitude: 4.7°
Azimuth: 236.2°