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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
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All Constellations » Vulpecula » 

21 Vulpeculae

Altitude: 30.8°   Azimuth: 278.5°   Direction: West

21 Vulpeculae is a variable sub-giant star in the constellation of Vulpecula.

21 Vulpeculae visual magnitude is 5.18. Because of its reltive faintness, 21 Vulpeculae 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 21 Vulpeculae:


21 Vulpeculae is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 30.8°
Azimuth: 278.5°
Direction: West

Celestial coordinates and finder chart of 21 Vulpeculae

21 Vulpeculae is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 21 Vulpeculae are provided in the following table:

20h 14m 14s
+28° 41’ 40”

The simplified sky map below shows the position of 21 Vulpeculae in the sky:

Finder chart 21 Vulpeculae star
Simplified finder chart for 21 Vulpeculae.

Visibility of 21 Vulpeculae 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 21 Vulpeculae 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: 61.3°
Max altitude: 67.2°
Azimuth: 298.7°

Digitized Sky Survey image of 21 Vulpeculae

The image below is a photograph of 21 Vulpeculae 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 21 Vulpeculae is 0.014 arcsec per year in Right Ascension and -0.022 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 21 Vulpeculae star
DSS2 image of 21 Vulpeculae. The red arrow shows the motion of 21 Vulpeculae during the next 10000 years (2.33 arcmin in Right Ascension and -3.67 arcmin in declination);

Distance of 21 Vulpeculae from the Sun and relative movement

21 Vulpeculae is distant 326.98 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

100.30 pc
326.98 ly
7 km/s
0.014 arcsec/year
-0.022 arcsec/year

Spectral properties of 21 Vulpeculae

21 Vulpeculae belongs to spectral class A7 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where 21 Vulpeculae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 21 Vulpeculae. Attribution: Richard Powell / CC BY-SA

Alternative designations of 21 Vulpeculae

21 Vulpeculae