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Hercules Constellation
Constellation Hercules the Strongman Star Map

Hercules, the Strongman (Her)


The Northern constellation of Hercules, the Strongman, is best viewed in Summer during the month of July.

Hercules is the 5th largest constellation. It's brightest star is Kornephorus at magnitude 2.78. The boundary of the Hercules constellation contains 23 stars that host known exoplanets.

      1. Pronunciation:
      2. HER-q-leez
      1. Meaning:
      2. Strongman
      1. Genitive:
      2. Herculis
      1. Abbreviation:
      2. Her
      1. Asterism:
      2. Keystone
      1. Constellation Family:
      2. Hercules
      1. Hemisphere:
      2. Northern
      1. Quadrant:
      2. NQ3
      1. Visibility:
      2. 90° N - 50° S
      1. Best viewing month*:
      2. July
      1. Area:
      2. 1225 sq. degrees
      1. Size:
      2. 5th largest
      1. Right Ascension (avg):
      2. 17h 26m
      1. Declination (avg):
      2. 27°
      1. Brightest star:
      2. Kornephorus  (2.78)
      1. Stars with planets:
      2. 23

    Brightest Stars in Hercules

    The 10 brightest stars in the constellation Hercules by magnitude.

        1. Star
        2. Magnitude
        3. Spectral class

      Double Stars in hercules

      These are the brightest and easiest-to-find double, triple, and quadruple star systems in the constellation hercules. Also see all star clusters.

          1. Star system
          2. Magnitudes
          3. Type
          1. Kappa herculis
          2. 5.1, 6.2
          3. double
          1. Alpha herculis
          2. 3.5, 5.4
          3. double
          1. Delta herculis
          2. 3.1, 8.3
          3. double
          1. Rho herculis
          2. 4.5, 5.4
          3. double
          1. 95 herculis
          2. 4.9, 5.2
          3. double

        Star Clusters in Hercules

        The most notable and easy-to-find star clusters in the constellation Hercules . Also see all star clusters.

            1. Star cluster
            2. Catalog #
            3. Cluster type

          Nebulae in Hercules

          Notable and easy-to-find nebulae in the constellation Hercules. Also see all nebulae.

              1. Nebula name
              2. Catalog #
              3. Nebula type

            Galaxies in Hercules

            The most notable galaxies in the constellation Hercules. Also see all galaxies.

                1. Name
                2. Alt name
                3. Type

              Milky Way Satellites in Hercules

              Dwarf satellite galaxies that orbit the Milky Way Galaxy located in the constellation Hercules. Also see all Milky Way satellite galaxies.

                  1. Galaxy name
                  2. Alt name
                  3. Magnitude
                  1. Hercules Dwarf
                  2. 14.7

                Neutron Stars in Hercules

                These are the most well-known neutron stars in the constellation Hercules. Although neutron stars cannot be seen in any amateur telescope, they are at the center of many supernova remnant nebulae, which can be seen. Also see all neutron stars.

                    1. Neutron star
                    2. Type

                  The Hero of the Night Sky

                  Hercules, known for the legendary Greek hero, is a constellation located in the Northern Hemisphere. As the fifth-largest of the 88 modern constellations, it spans a significant area of the night sky. The constellation is rich in deep sky objects and is home to one of the brightest globular clusters in the Northern Hemisphere.

                  Historical Overview

                  Hercules is one of the oldest constellations, with roots in ancient Babylon and Greece. To the ancient Greeks, this constellation represented Hercules, the demigod known for his strength and his twelve labors. Ptolemy, the Greco-Roman astronomer, listed it among his 48 constellations in the 2nd century. Despite its ancient origins, the constellation's shape doesn't resemble the hero and is often depicted as a man kneeling or a man wearing a cloak.

                  Location and Main Features

                  Hercules is located in the fourth quadrant of the Northern Hemisphere (NQ4) and can be seen at latitudes between +90? and -50?. It is bordered by constellations such as Draco, Bootes, Corona Borealis, Serpens Caput, Ophiuchus, Aquila, Sagitta, and Lyra. It spans 1225 square degrees, making it one of the larger constellations in the night sky.

                  Major Stars

                  Despite its large size, Hercules does not have any exceptionally bright stars. The brightest star, Alpha Herculis or Rasalgethi, is a red giant variable star with an apparent magnitude that varies from 3.1 to 3.9. The star's name comes from the Arabic phrase meaning "the kneeler's head," referring to the constellation's depiction as a kneeling man.

                  Beta Herculis or Kornephoros, meaning "club-bearer" in Greek, is another significant star. It's a yellow giant with a magnitude of 2.81, making it nearly as bright as Alpha Herculis. Gamma Herculis and Delta Herculis are other notable stars, both of them being binary star systems.

                  Deep Sky Objects

                  Hercules is home to several deep-sky objects, the most famous of which is M13 or the Hercules Globular Cluster. This is one of the brightest globular clusters in the Northern Hemisphere and can be seen with the naked eye under good conditions. The cluster contains hundreds of thousands of stars and is about 25,000 light-years away.

                  In addition to M13, Hercules houses another globular cluster, M92, which is often overshadowed by the larger M13 but is a worthy target for amateur astronomers. Several galaxies also reside within the boundaries of Hercules, including NGC 6210 and Abell 2151 (the Hercules Cluster of galaxies).


                  Hercules reaches its highest point in the sky during the months of July and August, making these the best months for observation. In mid-northern latitudes, Hercules is visible in the evening from late spring through the summer and into early fall. The "Keystone" asterism, a quadrilateral formed by the stars Epsilon, Zeta, Eta, and Pi Herculis, can serve as a guide to finding the constellation and its deep-sky objects.

                  Hercules in Modern Astronomy

                  Today, Hercules serves as an important navigation aid for astronomers and is a popular target for amateur astronomers due to its prominent globular clusters and galaxies. Moreover, the search for exoplanets has revealed several within the constellation, adding another dimension to our understanding of this vast celestial expanse.

                  * Constellation shown for northen hemisphere skies. For the southern hemisphere, constellations appear rotated 180 degrees (upside-down and left-right reversed) from what is shown. Remember that seasons are reversed too - summer in northern latitudes is winter in southern latitudes.

                  ** Circumpolar constellations are visible year-round in the hemisphere listed (and not at all in the opposite hemisphere).