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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:57  
clear_day Transit: 12:48  
SunsetSet: 18:39 south
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All Constellations » Delphinus » 

Sualocin - α Delphini (alpha Delphini)

Altitude: 28.8°   Azimuth: 259.1°   Direction: West

Sualocin, also designated as α Delphini (alpha Delphini), is a variable and multiple sub-giant star in the constellation of Delphinus.

Sualocin visual magnitude is 3.77. Because of its moderate brightness, Sualocin should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about Sualocin:


Sualocin - α Delphini (alpha Delphini) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 28.8°
Azimuth: 259.1°
Direction: West

Celestial coordinates and finder chart of Sualocin

Sualocin is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Sualocin are provided in the following table:

20h 39m 38s
+15° 54’ 42”

The simplified sky map below shows the position of Sualocin in the sky:

Finder chart Sualocin - α Delphini (alpha Delphini) star
Simplified finder chart for Sualocin - α Delphini (alpha Delphini).

Visibility of Sualocin from your location

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

Today's Sualocin - α Delphini (alpha Delphini) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 74.1°
Max altitude: 54.4°
Azimuth: 285.9°

Digitized Sky Survey image of Sualocin

The image below is a photograph of Sualocin 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). The proper motion of Sualocin is 0.066 arcsec per year in Right Ascension and -0.002 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Sualocin - α Delphini (alpha Delphini) star
DSS2 image of Sualocin. The red arrow shows the motion of Sualocin during the next 10000 years (11.00 arcmin in Right Ascension and -0.33 arcmin in declination);

Distance of Sualocin from the Sun and relative movement

Sualocin is distant 240.59 light years from the Sun and it is moving towards the Sun at the speed of 3 kilometers per second.

73.80 pc
240.59 ly
-3 km/s
0.066 arcsec/year
-0.002 arcsec/year

Spectral properties of Sualocin

Sualocin belongs to spectral class B9 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where Sualocin is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of Sualocin. Attribution: Richard Powell / CC BY-SA

Sualocin star system properties

Sualocin is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Sualocin double sysyem:

43.4 arcsec

Alternative designations of Sualocin

α Delphini
(alpha Delphini)