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Thanks for reading the news of the star dog decorating the nights of February 2021 .. “Sirius” is easily seen with the naked eye and now with the details of the news
Cairo – Samia Sayed – The remaining February nights are a wonderful time to see the Star of Sirius, which can be easily spotted with the naked eye, as it is the brightest star in the dome of the sky and the Most northern hemisphere observers see Sirius on the southeast horizon at the start of the night or to the southwest at dawn in winter nights until mid-spring, despite the blue-white color from Sirius, this star is called the Rainbow Star, because it often flashes in many colors.
The Jeddah Astronomical Society revealed in a report that the brightness of Sirius’ star and its color changes sometimes cause people to believe they are seeing an unidentified flying object, simply these color changes occur when light of a bright star such as Sirius passes through a dense layer of Earth’s atmosphere and affects the varying density and temperature of Earth’s air to visible starlight, especially when the star is low in the sky.
The report continued: This question also occurs with other stars, but it is more evident with Sirius as it is a very bright star, and as observed from all over the world, the Star of Sirius shines in the middle of the evening. in December and mid-April, it sets in the southwest by mid-evening.
The star Sirius is easy to find, but anyone who knows the constellation Orion or Gemini (Orion) can simply draw a line through Orion’s belt to find the star Sirius, and Sirius is known as “the dog star “because it is the main star of a group of Canis Major stars, or the elder dog.
During the summer, the star of Sirius will be behind the sun as seen from earth in the northern hemisphere, and in late summer it will appear on the eastern horizon before sunrise (near the sun in the earthly sky).
The apparent brightness of the star Sirius is (-1.44), which is therefore – brighter – than any other star, knowing that there are stars brighter than Sirius in terms of actual energy and light produced. , but they are more distant, and therefore appear weaker to us, and generally, only objects The sun, moon, Venus, Jupiter, Mars and Mercury are the sun, moon, Venus and Mercury which surpass Sirius (and sometimes Sirius also surpasses Mercury). Disregarding the sun, the second brightest star in the earth’s sky after Sirius – is Suhail.
The star Sirius is at a distance of 8.6 light years and is therefore one of the stars closest to us after the sun, and Sirius is classified as an “A” type star, which means that it is warmer than the sun and its surface temperature is about 9,667 degrees Celsius compared to the sun 5,505 degrees Celsius, which is a Main sequence star, which means that it produces most of its energy in converting hydrogen to helium by nuclear fusion.
Sirius has a little companion, who is a little star aptly called “the puppy”. This name indicates vigor, “but in fact Sirius’ companion is a dead star called a white dwarf the size of the earth. It is very faint and it is necessary to use a telescope to see it.
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