4 Herculis

4 Herculis is a variable star in the constellation of Hercules.

4 Herculis visual magnitude is 5.75. Because of its reltive faintness, 4 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 4 Herculis:

Color of 4 Herculis ⬤

Magnitude of 4 Herculis 5.75

Class

VISIBILITY RIGHT NOW 4 Herculis is above the horizon from Greenwich, United Kingdom [change]. Altitude: 19°.

Celestial coordinates and finder chart of 4 Herculis

4 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 4 Herculis are provided in the following table:

Right Ascension J2000 15h 55m 30s

Declination J2000 +42° 33’ 57”

Galactic Longitude 67.77°

Galactic Latitude 49.78°

Constellation Hercules

The simplified sky map below shows the position of 4 Herculis in the sky:

Simplified finder chart for 4 Herculis.

Visibility of 4 Herculis from your location

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

4 Herculis is circumpolar and transits at 03:18 UTC (altitude: 81.1°)

Digitized Sky Survey image of 4 Herculis

The image below is a photograph of 4 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 4 Herculis is -0.025 arcsec per year in Right Ascension and 0.015 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 4 Herculis. The red arrow shows the motion of 4 Herculis during the next 10000 years (-4.17 arcmin in Right Ascension and 2.50 arcmin in declination);

Distance of 4 Herculis from the Sun and relative movement

4 Herculis is distant 481.54 light years from the Sun and it is moving towards the Sun at the speed of 17 kilometers per second.

Distance (parsec) 147.71 pc

Distance (light year) 481.54 ly

Heliocentric radial velocity -17 km/s

Proper Motion RA -0.025 arcsec/year

Proper Motion Dec 0.015 arcsec/year

Spectral properties of 4 Herculis

4 Herculis belongs to spectral class B9

Absolute magnitude -0.10

Spectral Type B9

Color Index (B-V) -0.11

Temperature of 4 Herculis 11744K

The red dot in the diagram below shows where 4 Herculis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 4 Herculis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 4 Herculis

Flamsteed designation 4 Herculis

Henry Draper Catalogue HD142926

SAO Catalogue SAO45790

Hipparcos Catalogue HIP77986

Durchmusterung Catalogue BD+42 2652

General Catalogue of Variable Stars Var?

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In Evidence

Other stars in Hercules