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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 » 

Rotanev - β Delphini (beta Delphini)

Altitude: 29.5°   Azimuth: 255.8°   Direction: West-South-West

Rotanev, also designated as β Delphini (beta Delphini), is a multiple sub-giant star in the constellation of Delphinus.

Rotanev visual magnitude is 3.63. Because of its moderate brightness, Rotanev 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 Rotanev:


Rotanev - β Delphini (beta Delphini) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 29.5°
Azimuth: 255.8°
Direction: West-South-West

Celestial coordinates and finder chart of Rotanev

Rotanev 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 Rotanev are provided in the following table:

20h 37m 32s
+14° 35’ 43”

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

Finder chart Rotanev - β Delphini (beta Delphini) star
Simplified finder chart for Rotanev - β Delphini (beta Delphini).

Visibility of Rotanev 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 Rotanev - β Delphini (beta 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: 75.4°
Max altitude: 53.1°
Azimuth: 284.6°

Digitized Sky Survey image of Rotanev

The image below is a photograph of Rotanev 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 Rotanev is 0.113 arcsec per year in Right Ascension and -0.033 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Rotanev - β Delphini (beta Delphini) star
DSS2 image of Rotanev. The red arrow shows the motion of Rotanev during the next 1000 years (1.88 arcmin in Right Ascension and -0.55 arcmin in declination);

Distance of Rotanev from the Sun and relative movement

Rotanev is distant 97.34 light years from the Sun and it is moving towards the Sun at the speed of 23 kilometers per second.

29.86 pc
97.34 ly
-23 km/s
0.113 arcsec/year
-0.033 arcsec/year

Spectral properties of Rotanev

Rotanev belongs to spectral class F5 and has a luminosity class of IV corresponding to a sub-giant star.


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

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

Rotanev star system properties

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

0.6 arcsec

Alternative designations of Rotanev

β Delphini
(beta Delphini)