73 Herculis

73 Herculis is a variable hypergiant star in the constellation of Hercules.

73 Herculis visual magnitude is 5.74. Because of its reltive faintness, 73 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 73 Herculis:

Color of 73 Herculis ⬤

Magnitude of 73 Herculis 5.74

Class Hypergiant

VISIBILITY RIGHT NOW 73 Herculis is above the horizon from Greenwich, United Kingdom [change]. Altitude: 3°.

Celestial coordinates and finder chart of 73 Herculis

73 Herculis 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 73 Herculis are provided in the following table:

Right Ascension J2000 17h 24m 06s

Declination J2000 +22° 57’ 37”

Galactic Longitude 45.53°

Galactic Latitude 28.86°

Constellation Hercules

The simplified sky map below shows the position of 73 Herculis in the sky:

Simplified finder chart for 73 Herculis.

Visibility of 73 Herculis from your location

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

Today's 73 Herculis rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 67.0° RISE 21:52

Max altitude: 61.5° TRANSIT 6:02

Azimuth: 293.0° SET 14:08

RIGHT NOW 73 Herculis is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 73 Herculis

The image below is a photograph of 73 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 73 Herculis is -0.046 arcsec per year in Right Ascension and -0.032 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 73 Herculis. The red arrow shows the motion of 73 Herculis during the next 10000 years (-7.67 arcmin in Right Ascension and -5.33 arcmin in declination);

Distance of 73 Herculis from the Sun and relative movement

73 Herculis is distant 139.50 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

Distance (parsec) 42.79 pc

Distance (light year) 139.50 ly

Heliocentric radial velocity -20 km/s

Proper Motion RA -0.046 arcsec/year

Proper Motion Dec -0.032 arcsec/year

Spectral properties of 73 Herculis

73 Herculis belongs to spectral class F0 and has a luminosity class of IV corresponding to a hypergiant star.

Absolute magnitude 2.58

Spectral Type F0IV

Color Index (B-V) 0.21

Temperature of 73 Herculis 8086K

The red dot in the diagram below shows where 73 Herculis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 73 Herculis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 73 Herculis

Flamsteed designation 73 Herculis

Henry Draper Catalogue HD157728

SAO Catalogue SAO85062

Hipparcos Catalogue HIP85157

Durchmusterung Catalogue BD+23 3100

FK5 Catalogue 3383

General Catalogue of Variable Stars 8606

How to support us

In Evidence

Other stars in Hercules