21 Aquarii

Below the horizon. Rise: 17:16 | Tran: 22:56 | Set: 4:41

Alt: -40.99° Az: 344.50° Direction: North-North-West

21 Aquarii is a giant star of spectral class K4 in the constellation of Aquarius.

21 Aquarii visual magnitude is 5.49. Because of its faintness, 21 Aquarii 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 Aquarii. The red arrow shows the motion of 21 Aquarii during the next 10000 years (-1.33 arcmin in Right Ascension and -10.83 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 21h 26m 34s

Declination -03° 26’ 56”

Hour Angle 11h 13m 22s

Sideral Time 08h 39m 56s

J2000

Right Ascension 21h 25m 17s

Declination -03° 33’ 24”

Galactic Coordinates

Galactic Longitude 49.19°

Galactic Latitude -35.51°

Finder Chart

Simplified finder chart for 21 Aquarii.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.49

Class Giant

Absolute magnitude 0.00

Spectral Type K4III

Color Index (B-V) 1.46

Temperature 3855K

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

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

Distance, Radial Speed, Proper Motion

21 Aquarii is distant 408.01 light years from the Sun and it is moving towards the Sun at the speed of 24 kilometers per second.

Distance (parsec) 125.16

Distance (light year) 408.01

Radial Speed -24 km/s

Proper Motion RA -0.008 arcsec/y

Proper Motion Dec -0.065"/y

Alternative Designations

Flamsteed designation 21 Aquarii

Henry Draper Catalogue HD203926

SAO Catalogue SAO145384

Hipparcos Catalogue HIP105767

Durchmusterung Catalogue BD-04 5446

FK5 Catalogue 3708

Visibility from Your Location

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

Azimuth: 93.4° RISE 17:16

Max altitude: 35.1° TRANSIT 22:56

Azimuth: 266.6° SET 4:41

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Aquarius