Sadalmelik - α Aquarii (alpha Aquarii)

Sadalmelik, also designated as α Aquarii (alpha Aquarii), is a double supergiant star in the constellation of Aquarius.

Sadalmelik visual magnitude is 2.96. Thanks to its high brightness, Sadalmelik 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 Sadalmelik:

Color of Sadalmelik ⬤

Magnitude of Sadalmelik 2.96

Class Supergiant

VISIBILITY RIGHT NOW Sadalmelik - α Aquarii (alpha Aquarii) is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of Sadalmelik

Sadalmelik 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 Sadalmelik are provided in the following table:

Right Ascension J2000 22h 05m 47s

Declination J2000 -00° 19’ 10”

Galactic Longitude 59.93°

Galactic Latitude -42.07°

Constellation Aquarius

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

Finder chart Sadalmelik - α Aquarii (alpha Aquarii) star

Simplified finder chart for Sadalmelik - α Aquarii (alpha Aquarii).

Visibility of Sadalmelik from your location

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

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

Azimuth: 90.3° RISE 4:35

Max altitude: 38.2° TRANSIT 10:31

Azimuth: 269.7° SET 16:28

RIGHT NOW Sadalmelik - α Aquarii (alpha Aquarii) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Sadalmelik

The image below is a photograph of Sadalmelik 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 Sadalmelik is 0.02 arcsec per year in Right Ascension and -0.01 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Sadalmelik - α Aquarii (alpha Aquarii) star

DSS2 image of Sadalmelik. The red arrow shows the motion of Sadalmelik during the next 10000 years (3.33 arcmin in Right Ascension and -1.67 arcmin in declination);

Distance of Sadalmelik from the Sun and relative movement

Sadalmelik is distant 758.14 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

Distance (parsec) 232.56 pc

Distance (light year) 758.14 ly

Heliocentric radial velocity 8 km/s

Proper Motion RA 0.02 arcsec/year

Proper Motion Dec -0.01 arcsec/year

Spectral properties of Sadalmelik

Sadalmelik belongs to spectral class G2 and has a luminosity class of I corresponding to a supergiant star.

Absolute magnitude -3.87

Spectral Type G2I

Color Index (B-V) 0.98

Temperature of Sadalmelik 4791K

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

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

Sadalmelik star system properties

Sadalmelik 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 Sadalmelik double sysyem:

Main star magnitude 2.96

Secondary star magnitude 11.96

Magnitude difference 9

Separation 113 arcsec

Alternative designations of Sadalmelik

Proper Name Sadalmelik

Bayer designation α Aquarii
(alpha Aquarii)

Flamsteed designation 34 Aquarii

Henry Draper Catalogue HD209750

SAO Catalogue SAO145862

Hipparcos Catalogue HIP109074

Durchmusterung Catalogue BD-01 4246

FK5 Catalogue 827

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