Sadalsuud - β Aquarii (beta Aquarii)

Sadalsuud, also designated as β Aquarii (beta Aquarii), is a multiple hypergiant star in the constellation of Aquarius.

Sadalsuud visual magnitude is 2.91. Thanks to its high brightness, Sadalsuud is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Sadalsuud:

Color of Sadalsuud ⬤

Magnitude of Sadalsuud 2.91

Class Hypergiant

VISIBILITY RIGHT NOW Sadalsuud - β Aquarii (beta Aquarii) is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of Sadalsuud

Sadalsuud is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Sadalsuud are provided in the following table:

Right Ascension J2000 21h 31m 33s

Declination J2000 -05° 34’ 15”

Galactic Longitude 48.02°

Galactic Latitude -37.88°

Constellation Aquarius

The simplified sky map below shows the position of Sadalsuud in the sky:

Finder chart Sadalsuud - β Aquarii (beta Aquarii) star

Simplified finder chart for Sadalsuud - β Aquarii (beta Aquarii).

Visibility of Sadalsuud from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Sadalsuud - β Aquarii (beta Aquarii) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 95.6° RISE 4:10

Max altitude: 32.9° TRANSIT 9:40

Azimuth: 264.4° SET 15:10

RIGHT NOW Sadalsuud - β Aquarii (beta Aquarii) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Sadalsuud

The image below is a photograph of Sadalsuud 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 Sadalsuud is 0.021 arcsec per year in Right Ascension and -0.008 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Sadalsuud - β Aquarii (beta Aquarii) star

DSS2 image of Sadalsuud. The red arrow shows the motion of Sadalsuud during the next 10000 years (3.50 arcmin in Right Ascension and -1.33 arcmin in declination);

Distance of Sadalsuud from the Sun and relative movement

Sadalsuud is distant 611.63 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

Distance (parsec) 187.62 pc

Distance (light year) 611.63 ly

Heliocentric radial velocity 7 km/s

Proper Motion RA 0.021 arcsec/year

Proper Motion Dec -0.008 arcsec/year

Spectral properties of Sadalsuud

Sadalsuud belongs to spectral class G0 and has a luminosity class of I corresponding to a hypergiant star.

Absolute magnitude -3.46

Spectral Type G0I

Color Index (B-V) 0.83

Temperature of Sadalsuud 5192K

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

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

Sadalsuud star system properties

Sadalsuud 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 Sadalsuud double sysyem:

Main star magnitude 2.91

Secondary star magnitude 10.81

Magnitude difference 7.9

Separation 35.5 arcsec

Alternative designations of Sadalsuud

Proper Name Sadalsuud

Bayer designation β Aquarii
(beta Aquarii)

Flamsteed designation 22 Aquarii

Henry Draper Catalogue HD204867

SAO Catalogue SAO145457

Hipparcos Catalogue HIP106278

Durchmusterung Catalogue BD-06 5770

FK5 Catalogue 808

Aitken Double Star Catalogue ADS15050

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