It is this celestial constellation of the northern hemisphere of the sky Tri (short Latin name for Triangulum) that is one of the most interesting objects for amateurs to explore.
Location in the sky
On a dark night, in the absence of bright light sources, we can detect it in the form of a figure clearly formed by three stars, similar to an elongated triangle. Their star magnitudes are expressed as follows: 3m and two 4m each.
So it can be seen with the naked eye.
By neighboring constellations, you can navigate in the starry sky to find the constellation Triangulum. Andromeda, Perseus, Aries and Pisces will help you with this.
From history and mythology
This constellation has been known since antiquity, but where exactly the name came from remains unknown. There are notes about him in Babylonian catalogs and manuscripts, which are recorded around 1100 BC. The constellation has been known since the dawn of astronomy and was described by the Greek Ptolemy in the second century BC. The constellation Triangulum was present on the star charts of the Cretans and Phoenicians. Everything is talking aboutthat it has a long history. To one of the ancient astronomers, Eratosthenes, the constellation Triangulum resembled the resemblance to the delta of the Nile River, and in Greece it was called Deltonon because of the outlines that resembled the capital Greek letter "delta".
From written sources on Greek mythology it is known that the constellation The triangle was identified with the island of Demeter - Sicily - and its three main cities.
Let's talk about characteristic peaks
The constellation Triangle forms a shape that resembles a geometric figure, as its name suggests.
Delineated by the three most prominent stars in this constellation. The brightest cosmic objects Alpha, Beta and Gamma form the actual shape of the triangle. The most significant cosmic bodies in the constellation Triangulum include the brightest object in its star system, a beta called Deltotum. From Earth to this star, the distance is approximately 125 light years. The second brightest in this constellation - Alpha - according to the classification, belongs to the white-yellow subgiants. It is also called the top of the triangle, it is a double star of a complex spectrum. The distance to the stellar object is 64.2 light years. Gamma, the third brightest star, is a white dwarf, located at a distance of 188 light years from Earth. Delta has the same structure as Alpha. It consists of two dwarfs - yellow and orange. The distance between our planet and these stars is at least 35 light years.
Spiral galaxy M33
The constellation is easily recognizable and contains in its visible boundaries at least not the brightest, but one fairly well-known spiral galaxy M33, which belongs to the Sc type and is part of the group of local galaxies.
There are several nebulae in it, there are many massive bright blue stars and star clusters with increasing density towards its center. The distance from the Sun to the spiral galaxy M33 is three million light years. More than 110 variable stars have been discovered in this galaxy so far.
The largest objects in this region of the sky are the Andromeda galaxy, the Milky Way and the Triangulum galaxy, also known as M33 or NGC598.
These largest spiral galaxies have their own subgroups of galaxies. Most of them are associated with "maternal" huge gravitational forces. The Triangulum Galaxy honorably ranks third (after Andromeda and the Milky Way) in the local group of galaxies. Its diameter is approximately 50-55.6 thousand light years.
A fairly large black hole M33 X-7 has been discovered in the Triangulum galaxy. The mass of the cosmic body is 16 times greater than that of the Sun. This is one of the largest black holes, except for supermassive holes at a fairly close distance from us.
The constellation Triangulum also includes other galactic systems, they are less bright, and their magnitude does not exceed the eleventh star. The largest of them is spiralgalaxy NGC925. The distance from our Sun to NGC925 is 46 million light years. It is far enough, but thanks to super-powerful telescopes, astronomers study outer space and the unique objects of the Universe in this part of the sky.
