90 Herculis

90 Herculis is a variable and double giant star in the constellation of Hercules.

90 Herculis visual magnitude is 5.16. Because of its reltive faintness, 90 Herculis should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 90 Herculis:

Color of 90 Herculis ⬤

Magnitude of 90 Herculis 5.16

Class Giant

VISIBILITY RIGHT NOW 90 Herculis is above the horizon from Greenwich, United Kingdom [change]. Altitude: 78°.

Celestial coordinates and finder chart of 90 Herculis

90 Herculis is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 90 Herculis are provided in the following table:

Right Ascension J2000 17h 53m 18s

Declination J2000 +40° 00’ 29”

Galactic Longitude 66.09°

Galactic Latitude 27.66°

Constellation Hercules

The simplified sky map below shows the position of 90 Herculis in the sky:

Simplified finder chart for 90 Herculis.

Visibility of 90 Herculis from your location

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

90 Herculis is circumpolar and transits at 05:31 UTC (altitude: 78.5°)

Digitized Sky Survey image of 90 Herculis

The image below is a photograph of 90 Herculis 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 90 Herculis is 0.011 arcsec per year in Right Ascension and 0.053 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 90 Herculis. The red arrow shows the motion of 90 Herculis during the next 10000 years (1.83 arcmin in Right Ascension and 8.83 arcmin in declination);

Distance of 90 Herculis from the Sun and relative movement

90 Herculis is distant 363.43 light years from the Sun and it is moving towards the Sun at the speed of 35 kilometers per second.

Distance (parsec) 111.48 pc

Distance (light year) 363.43 ly

Heliocentric radial velocity -35 km/s

Proper Motion RA 0.011 arcsec/year

Proper Motion Dec 0.053 arcsec/year

Spectral properties of 90 Herculis

90 Herculis belongs to spectral class K1 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -0.08

Spectral Type K1III

Color Index (B-V) 1.18

Temperature of 90 Herculis 4348K

The red dot in the diagram below shows where 90 Herculis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 90 Herculis. Attribution: Richard Powell / CC BY-SA

90 Herculis star system properties

90 Herculis is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the 90 Herculis double sysyem:

Main star magnitude 5.16

Secondary star magnitude 8.46

Magnitude difference 3.3

Separation 1.6 arcsec

Alternative designations of 90 Herculis

Flamsteed designation 90 Herculis

Henry Draper Catalogue HD163217

SAO Catalogue SAO47037

Hipparcos Catalogue HIP87563

Durchmusterung Catalogue BD+40 3233

General Catalogue of Variable Stars 9834

Aitken Double Star Catalogue ADS10875

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In Evidence

Other stars in Hercules