η Aquarii (eta Aquarii)

η Aquarii is a sub-giant star in the constellation of Aquarius.

η Aquarii visual magnitude is 4.02. Because of its moderate brightness, η Aquarii should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about η Aquarii:

Color of η Aquarii ⬤

Magnitude of η Aquarii 4.02

Class Sub-giant

VISIBILITY RIGHT NOW η Aquarii (eta Aquarii) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 9°.

Celestial coordinates and finder chart of η Aquarii

η Aquarii 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 η Aquarii are provided in the following table:

Right Ascension J2000 22h 35m 21s

Declination J2000 -00° 07’ 02”

Galactic Longitude 66.84°

Galactic Latitude -47.61°

Constellation Aquarius

The simplified sky map below shows the position of η Aquarii in the sky:

Finder chart η Aquarii (eta Aquarii) star

Simplified finder chart for η Aquarii (eta Aquarii).

Visibility of η Aquarii from your location

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

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

Azimuth: 90.1° RISE 4:43

Max altitude: 38.4° TRANSIT 10:40

Azimuth: 269.9° SET 16:38

RIGHT NOW η Aquarii (eta Aquarii) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of η Aquarii

The image below is a photograph of η Aquarii 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 η Aquarii is 0.091 arcsec per year in Right Ascension and -0.056 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of η Aquarii. The red arrow shows the motion of η Aquarii during the next 1000 years (1.52 arcmin in Right Ascension and -0.93 arcmin in declination);

Distance of η Aquarii from the Sun and relative movement

η Aquarii is distant 183.46 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

Distance (parsec) 56.27 pc

Distance (light year) 183.46 ly

Heliocentric radial velocity -8 km/s

Proper Motion RA 0.091 arcsec/year

Proper Motion Dec -0.056 arcsec/year

Spectral properties of η Aquarii

η Aquarii belongs to spectral class B9 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude 0.27

Spectral Type B9IV

Color Index (B-V) -0.09

Temperature of η Aquarii 11407K

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

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

Alternative designations of η Aquarii

Bayer designation η Aquarii
(eta Aquarii)

Flamsteed designation 62 Aquarii

Henry Draper Catalogue HD213998

SAO Catalogue SAO146181

Hipparcos Catalogue HIP111497

Durchmusterung Catalogue BD-00 4384

FK5 Catalogue 850

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Other stars in Aquarius