25 Aquarii

Above the horizon. Rise: 21:29 | Tran: 3:43 | Set: 9:53

Alt: 19.52° Az: 247.97° Direction: West-South-West

25 Aquarii is a double hypergiant star of spectral class K0 in the constellation of Aquarius.

25 Aquarii visual magnitude is 5.1. Because of its faintness, 25 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 25 Aquarii. The red arrow shows the motion of 25 Aquarii during the next 10000 years (-4.33 arcmin in Right Ascension and -13.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 21h 40m 50s

Declination +02° 21’ 36”

Hour Angle 04h 03m 55s

Sidereal Time 01h 44m 46s

J2000

Right Ascension 21h 39m 33s

Declination +02° 14’ 36”

Galactic Coordinates

Galactic Longitude 57.54°

Galactic Latitude -35.28°

Finder Chart

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Finder chart for 25 Aquarii.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.1

Class Hypergiant

Absolute magnitude 0.76

Spectral Type K0III

Color Index (B-V) 1.04

Temperature 4649K

The red dot in the diagram below shows where 25 Aquarii is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 25 Aquarii. Attribution: Richard Powell / CC BY-SA

Star System Properties

25 Aquarii is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the 25 Aquarii double sysyem:

Main star magnitude 5.1

Secondary star magnitude 11.4

Magnitude difference 6.3

Separation 136.8 arcsec

Distance, Radial Speed, Proper Motion

25 Aquarii is distant 240.59 light years from the Sun and it is moving towards the Sun at the speed of 35 kilometers per second.

Distance (parsec) 73.80

Distance (light year) 240.59

Radial Speed -35 km/s

Proper Motion RA -0.026 arcsec/y

Proper Motion Dec -0.082"/y

Alternative Designations

Flamsteed designation 25 Aquarii

Henry Draper Catalogue HD206067

SAO Catalogue SAO126965

Hipparcos Catalogue HIP106944

Durchmusterung Catalogue BD+01 4517

FK5 Catalogue 3729

Visibility from Your Location

Today's 25 Aquarii rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 87.6° RISE 21:29

Max altitude: 40.9° TRANSIT 3:43

Azimuth: 272.4° SET 9:53

Set Location

Other stars in Aquarius