81 Aquarii

Below the horizon. Rise: 2:38 | Tran: 8:02 | Set: 13:25

Alt: -41.71° Az: 30.64° Direction: North-North-East

81 Aquarii is a giant star of spectral class K5 in the constellation of Aquarius.

81 Aquarii visual magnitude is 6.21. Because of its faintness, 81 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 81 Aquarii. The red arrow shows the motion of 81 Aquarii during the next 10000 years (-2.50 arcmin in Right Ascension and -1.83 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 23h 02m 42s

Declination -06° 55’ 27”

Hour Angle 13h 30m 08s

Sidereal Time 12h 32m 51s

J2000

Right Ascension 23h 01m 23s

Declination -07° 03’ 39”

Galactic Coordinates

Galactic Longitude 65.42°

Galactic Latitude -57.08°

Finder Chart

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Finder chart for 81 Aquarii.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 6.21

Class Giant

Absolute magnitude 0.67

Spectral Type K5III

Color Index (B-V) 1.41

Temperature 3934K

The red dot in the diagram below shows where 81 Aquarii is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 81 Aquarii. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

81 Aquarii is distant 418.49 light years from the Sun and it is moving towards the Sun at the speed of 2 kilometers per second.

Distance (parsec) 128.37

Distance (light year) 418.49

Radial Speed -2 km/s

Proper Motion RA -0.015 arcsec/y

Proper Motion Dec -0.011"/y

Alternative Designations

Flamsteed designation 81 Aquarii

Henry Draper Catalogue HD217531

SAO Catalogue SAO146447

Hipparcos Catalogue HIP113674

Durchmusterung Catalogue BD-07 5910

Visibility from Your Location

Today's 81 Aquarii rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 96.9° RISE 2:38

Max altitude: 31.6° TRANSIT 8:02

Azimuth: 263.1° SET 13:25

Set Location

Other stars in Aquarius