21 Vulpeculae

Above the horizon. Rise: 10:44 | Tran: 19:36 | Set: 4:31

Alt: 47.90° Az: 103.74° Direction: East-South-East

21 Vulpeculae is a variable sub-giant star of spectral class A7 in the constellation of Vulpecula.

21 Vulpeculae visual magnitude is 5.18. Because of its faintness, 21 Vulpeculae is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

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);

Celestial Coordinates

Apparent

Right Ascension 20h 15m 15s

Declination +28° 46’ 16”

Hour Angle 20h 48m 03s

Sidereal Time 17h 03m 19s

J2000

Right Ascension 20h 14m 14s

Declination +28° 41’ 40”

Galactic Coordinates

Galactic Longitude 67.66°

Galactic Latitude -3.27°

Finder Chart

Simplified finder chart for 21 Vulpeculae.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.18

Class Sub-giant

Absolute magnitude 0.17

Spectral Type A7IV

Color Index (B-V) 0.18

Temperature 8321K

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

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

Distance, Radial Speed, Proper Motion

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.

Distance (parsec) 100.30

Distance (light year) 326.98

Radial Speed 7 km/s

Proper Motion RA 0.014 arcsec/y

Proper Motion Dec -0.022"/y

Alternative Designations

Flamsteed designation 21 Vulpeculae

Henry Draper Catalogue HD192518

SAO Catalogue SAO88391

Hipparcos Catalogue HIP99738

Durchmusterung Catalogue BD+28 3675

General Catalogue of Variable Stars NU Vul

Visibility from Your Location

Today's 21 Vulpeculae rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 61.2° RISE 10:44

Max altitude: 67.3° TRANSIT 19:36

Azimuth: 298.8° SET 4:31

Set Location

Other stars in Vulpecula