η Delphini (eta Delphini)

Above the horizon. Rise: 19:20 | Tran: 2:30 | Set: 9:35

Alt: 50.36° Az: 199.07° Direction: South-South-West

η Delphini is a variable sub-giant star of spectral class A3 in the constellation of Delphinus.

η Delphini visual magnitude is 5.38. Because of its faintness, η Delphini 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 η Delphini. The red arrow shows the motion of η Delphini during the next 10000 years (12.00 arcmin in Right Ascension and 4.33 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 20h 35m 09s

Declination +13° 06’ 57”

Hour Angle 00h 49m 26s

Sidereal Time 21h 24m 35s

J2000

Right Ascension 20h 33m 56s

Declination +13° 01’ 37”

Galactic Coordinates

Galactic Longitude 57.02°

Galactic Latitude -15.8°

Finder Chart

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Finder chart for η Delphini (eta Delphini).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.38

Class Sub-giant

Absolute magnitude 1.76

Spectral Type A3IV

Color Index (B-V) 0.07

Temperature 9328K

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

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

Distance, Radial Speed, Proper Motion

η Delphini is distant 172.94 light years from the Sun and it is moving towards the Sun at the speed of 25 kilometers per second.

Distance (parsec) 53.05

Distance (light year) 172.94

Radial Speed -25 km/s

Proper Motion RA 0.072 arcsec/y

Proper Motion Dec 0.026"/y

Alternative Designations

Bayer designation η Delphini
(eta Delphini)

Flamsteed designation 3 Delphini

Henry Draper Catalogue HD195943

SAO Catalogue SAO106248

Hipparcos Catalogue HIP101483

Durchmusterung Catalogue BD+12 4378

General Catalogue of Variable Stars 13147

Visibility from Your Location

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

Azimuth: 76.9° RISE 19:20

Max altitude: 51.6° TRANSIT 2:30

Azimuth: 283.1° SET 9:35

Set Location

Other stars in Delphinus