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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:00 
Transit: 13:04 
Sunset: 21:07
wb_twilight   (Civil Twilight)   What's Visible Now?
All Constellations »  Ophiuchus »  Deep Sky Objects » 

IC 4688 - Spiral Galaxy in Ophiuchus

Above the horizon.  Rise: 16:34 | Tran: 23:32 | Set: 6:34
Alt: 44.80°   Az: 142.00°   Direction: South-East

IC 4688 is a Spiral Galaxy in the Ophiuchus constellation. IC 4688 is situated close to the celestial equator and, as such, it is at least partly visible from both hemispheres in certain times of the year. Given its B magnitude of 14.7, IC 4688 is visible with the help of a telescope having an aperture of 20 inches (500mm) or more.

The image below is a photograph of IC 4688 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 4688 - Spiral Galaxy in Ophiuchus star
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DSS2 image of IC 4688 in the Red band. The green region on the image is a representation of the major (1.3 arcmin) and minor (0.95 arcmin) axes of the object's apparent size.

Celestial Coordinates

Apparent

18h 09m 20s
+11° 43’ 02”
22h 14m 01s
16h 23m 22s

J2000

18h 08m 12s
+11° 42’ 43”

Finder Chart

The simplified sky charts below show the position of IC 4688 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 IC 4688 - Spiral Galaxy in Ophiuchus star
Simplified finder chart for IC 4688 - Spiral Galaxy in Ophiuchus.

Finder chart IC 4688 - Spiral Galaxy in Ophiuchus star
Simplified finder chart for IC 4688 - Spiral Galaxy in Ophiuchus.

Photometric Information

The following table lists the magnitude of IC 4688 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).

14.7
11.24
10.56
10.24

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 4688.

23.54 mag/arcsec2

Apparent Size

The following table reports IC 4688 apparent angular size. The green area displayed on top of the DSS2 image of IC 4688 is a visual representation of it.
1.3 arcmin
0.95 arcmin
174°

Morphological Classification

IC 4688 - Spiral Galaxy in Ophiuchus 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 4688 - Spiral Galaxy in Ophiuchus in the Hubble de Vaucouleurs sequence.

IC 4688 - Spiral Galaxy in Ophiuchus
Visualization of the morphological classification of IC 4688 - Spiral Galaxy in Ophiuchus, 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

Today's IC 4688 - Spiral Galaxy in Ophiuchus rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 78.3°
Max altitude: 50.2°
Azimuth: 281.7°