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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:06 
Transit: 12:56 
Sunset: 20:47
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All Constellations »  Ara »  Deep Sky Objects » 

IC 4646 - Spiral Galaxy in Ara

Below the horizon.  Never rises today
Alt: -23.75°   Az: 194.81°   Direction: South-South-West

IC 4646 is a Spiral Galaxy in the Ara constellation. IC 4646 is situated south of the celestial equator and, as such, it is more easily visible from the southern hemisphere. Given its B magnitude of 12.65, IC 4646 is visible with the help of a telescope having an aperture of 10 inches (250mm) or more.

The image below is a photograph of IC 4646 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 IC 4646 - Spiral Galaxy in Ara star
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DSS2 image of IC 4646 in the Red band. The green region on the image is a representation of the major (2.77 arcmin) and minor (1.85 arcmin) axes of the object's apparent size.

Celestial Coordinates

Apparent

17h 26m 09s
-60° 01’ 15”
01h 51m 41s
19h 17m 50s

J2000

17h 23m 53s
-59° 59’ 57”

Finder Chart

The simplified sky charts below show the position of IC 4646 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.

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Finder chart for IC 4646 - Spiral Galaxy in Ara.

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Finder chart for IC 4646 - Spiral Galaxy in Ara.

Photometric Information

The following table lists the magnitude of IC 4646 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).

12.65
10.57
9.89
9.63

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 4646.

23.23 mag/arcsec2

Apparent Size

The following table reports IC 4646 apparent angular size. The green area displayed on top of the DSS2 image of IC 4646 is a visual representation of it.
2.77 arcmin
1.85 arcmin
179°

Morphological Classification

IC 4646 - Spiral Galaxy in Ara is classified as Spiral (SAc) according to the Hubble and de Vaucouleurs galaxy morphological classification. The diagram below shows a visual representation of the position of IC 4646 - Spiral Galaxy in Ara in the Hubble de Vaucouleurs sequence.

IC 4646 - Spiral Galaxy in Ara
Visualization of the morphological classification of IC 4646 - Spiral Galaxy in Ara, Spiral (SAc).
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

IC 4646 - Spiral Galaxy in Ara is currently not visible from Greenwich, UK