The Delphinus Constellation: A Comprehensive Guide

The Delphinus constellation, also known as the Dolphin constellation, is a small yet fascinating constellation located in the northern sky. This guide will delve into the history, mythology, and scientific aspects of this celestial wonder.

Historical Overview of Delphinus Constellation

The Delphinus constellation is one of the 88 modern constellations recognized by the International Astronomical Union. Despite its small size, it has a rich history that dates back to ancient times.

It was first catalogued by the Greek astronomer Ptolemy in the 2nd century. The constellation is visible in the summer months in the northern hemisphere, making it a popular feature in ancient stargazing.

The Name 'Delphinus'

The name 'Delphinus' is Latin for 'dolphin'. This name is a testament to the constellation's visual appearance, which resembles a dolphin leaping out of the water. The constellation's shape and name have remained consistent throughout history, highlighting its significance in various cultures.

It is one of the few constellations that has retained its original Latin name, further emphasizing its historical importance and widespread recognition.

Mythology Associated with Delphinus Constellation

Like many constellations, Delphinus is steeped in mythology. The constellation is often associated with several Greek myths, most notably those involving the god Poseidon.

One popular myth involves Poseidon's quest for a wife. According to the story, Poseidon desired to marry Amphitrite, a sea nymph. However, she fled to the Atlas mountains to avoid him. Poseidon sent several messengers to find her, one of which was a dolphin. The dolphin was successful in persuading Amphitrite to marry Poseidon, and as a reward, Poseidon placed the dolphin in the sky, creating the Delphinus constellation.

Other Mythological Associations

Delphinus is also associated with the story of Arion, a famous Greek poet and musician. According to the myth, Arion was kidnapped by pirates while returning from a music competition. To thank them for appreciating his music, Arion offered to play one last song before his death. This song attracted a group of dolphins, and when Arion was thrown overboard, a dolphin carried him to safety. In honor of this event, a dolphin was placed among the stars.

These myths not only add a layer of intrigue to the Delphinus constellation but also highlight the cultural significance of this celestial feature.

Scientific Aspects of Delphinus Constellation

From a scientific perspective, the Delphinus constellation is equally fascinating. Despite its small size, it contains several notable stars and deep sky objects.

The constellation consists of five main stars that form the shape of a dolphin. These stars are Sualocin, Rotanev, Gamma Delphini, Delta Delphini, and Beta Delphini. Each of these stars has unique characteristics and contributes to the overall brightness of the constellation.

Notable Stars and Objects

Sualocin and Rotanev are the brightest stars in the Delphinus constellation. Sualocin is a triple star system, while Rotanev is a binary star. Both stars are visible to the naked eye and contribute significantly to the constellation's visibility.

Gamma Delphini is a binary star located at the nose of the dolphin. This star is known for its contrasting color, with one star appearing gold and the other blue when viewed through a small telescope.

Delphinus also contains several deep sky objects. These include the globular cluster NGC 6934 and the planetary nebula NGC 6891. Both objects are challenging to observe due to their faintness but offer a rewarding view for experienced stargazers.

Observing Delphinus Constellation

Observing the Delphinus constellation can be a rewarding experience for both novice and experienced stargazers. The constellation is best viewed in the summer months in the northern hemisphere.

Despite its small size, Delphinus is relatively easy to locate due to its distinctive shape and proximity to other notable constellations. It is surrounded by several larger constellations, including Aquila, Pegasus, and Cygnus, which can serve as useful reference points.

Stargazing Tips

When observing Delphinus, it's helpful to use a star chart or app to locate the constellation. Once you've found the constellation, take some time to observe its distinctive shape and the brightness of its stars.

If you have a telescope, try observing the binary stars Gamma Delphini and Rotanev. These stars offer a beautiful contrast in color and a fascinating glimpse into the vastness of our universe.

Remember, stargazing is best done in a dark location away from city lights. Patience is also key, as it can take some time to locate specific constellations and objects.


The Delphinus constellation, with its rich history, fascinating mythology, and scientific interest, offers a wealth of exploration for stargazers of all levels. Whether you're drawn to its ancient stories or its celestial features, Delphinus is a testament to the beauty and mystery of our universe.

So, the next time you gaze up at the night sky, take a moment to locate this small but significant constellation. Who knows, you might just find yourself captivated by the celestial dolphin leaping among the stars.