Your Guide to the Solar System and the Night Sky
This site is free and ad-free thanks to the support of our users. If you can, please consider a donation.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:55  
clear_day Transit: 12:49  
SunsetSet: 18:41 south
sleep NighttimeWhat's Visible Now
All Constellations » Delphinus » 

17 Delphini

Altitude: 33.1°   Azimuth: 248.6°   Direction: West-South-West

17 Delphini is a variable hypergiant star in the constellation of Delphinus.

17 Delphini visual magnitude is 5.17. Because of its reltive faintness, 17 Delphini should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 17 Delphini:


17 Delphini is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 33.1°
Azimuth: 248.6°
Direction: West-South-West

Celestial coordinates and finder chart of 17 Delphini

17 Delphini 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 17 Delphini are provided in the following table:

20h 55m 36s
+13° 43’ 17”

The simplified sky map below shows the position of 17 Delphini in the sky:

Finder chart 17 Delphini star
Simplified finder chart for 17 Delphini.

Visibility of 17 Delphini 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 17 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: 76.3°
Max altitude: 52.2°
Azimuth: 283.7°

Digitized Sky Survey image of 17 Delphini

The image below is a photograph of 17 Delphini 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 17 Delphini is 0.021 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 17 Delphini star
DSS2 image of 17 Delphini. The red arrow shows the motion of 17 Delphini during the next 10000 years (3.50 arcmin in Right Ascension and -2.33 arcmin in declination);

Distance of 17 Delphini from the Sun and relative movement

17 Delphini is distant 473.84 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

145.35 pc
473.84 ly
-10 km/s
0.021 arcsec/year
-0.014 arcsec/year

Spectral properties of 17 Delphini

17 Delphini belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 17 Delphini is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of 17 Delphini. Attribution: Richard Powell / CC BY-SA

Alternative designations of 17 Delphini

17 Delphini