What Constellation is Regulus in?
Regulus is a bright star seen in the constellation Leo. It’s the brightest star in the constellation and among the brightest in Earth’s night sky.
How do you find Regulus?
Regulus is pretty easy to find in the sky. The star is part of the Sickle of Leo, a prominent asterism in the constellation Leo, and marks the lower end of the Sickle ‘s handle. The asterism looks like a backwards question mark and outlines the head of the celestial lion. The Sickle of Leo can be located using the stars of the Big Dipper.
How many light years away is Regulus?
Regulus is about 70 light-years away from Earth, making it the closest star of this type to our planet, according to astronomer David Darling. It has an apparent magnitude of 1.35, making it the 21st brightest star in the night sky.
Is Regulus the brightest star in Leo?
Regulus and its Leo neighbour Denebola are among the 58 bright stars that have been given a special status in the field of celestial navigation. They are the only navigational stars in Leo. Regulus is the faintest of the 22 first magnitude stars.
What is the name of the star that is a diminutive form of a rex?
The name Regulus is a diminutive form of “rex,“ which is Latin for “king.“. It was the Polish astronomer and mathematician Nicolaus Copernicus who gave the star this name, which was equivalent to Basiliskos (“little king”), used by the Greek astronomer Ptolemy. The star is also known by its Latin name Cor Leonis and the Arabic Qalb al-Asad …
What planets can be occulted by asteroids?
Alpha Leonis can also sometimes be occulted by asteroids, the minor planets in the inner solar system. For instance, 163 Erigone, a large, dark asteroid from the asteroid belt, about 73 kilometres in size, occulted Regulus on March 20, 2014. 166 Rhodope, an asteroid about 54.6 kilometres in size, occulted the star on October 19, 2005.
What is the primary component of the regulus system?
With a visual magnitude of 1.35, Regulus A is reponsible for the star system’s brightness and bluish colour.
How far is Regulus from the Sun?
Facts. Regulus lies only 0.46 degrees from the ecliptic, the Sun’s apparent path across the sky, through the zodiac constellations, and is regularly occulted by the Moon and very rarely by Mercury and Venus. Venus last occulted Regulus on July 7, 1959 and will do so again on October 1, 2044.
What is the brightest star in the constellation Leo?
Regulus. Regulus, also known as Alpha Leonis, is the brightest star in the constellation Leo and the 21st brightest star in the night sky. It has an apparent magnitude of 1.35 and lies at a distance of 79.3 light years, or 24.3 parsecs, from Earth. Alpha Leonis is not really a single star, but a multiple star system.
Where is Regulus in the sky?
Image: IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg) Regulus is pretty easy to find in the sky. The star is part of the Sickle of Leo, a prominent asterism in the constellation Leo, and marks the lower end of the Sickle ‘s handle.
How many days does it take for two stars to orbit around a common centre of mass?
The two stars complete an orbit around a common centre of mass every 40.11 days. They are separated by only 0.35 astronomical units. The companion was only discovered in 2008. The primary component of Regulus A has 3.8 solar masses and is only a few million years old.
What is the star that outlines the lion’s head?
Regulus is part of a relatively bright asterism known as the Sickle of Leo, which outlines the celestial lion’s head, mane and shoulders. Regulus sits at the base of the Sickle, marking the lion’s heart. The star is also one of the vertices of the Spring Triangle, a conspicuous asterism visible in the evening sky during the northern hemisphere spring.
Why is Regulus easy to find?
Regulus is easy to find and identify because it is part of a prominent asterism known as the Sickle of Leo. The Sickle looks like a backward question mark and consists of the stars that outline the mane of the celestial Lion, with Regulus at the base.
How long is the arc of the Regulus BC pair?
The Regulus BC pair is separated by 177 seconds of arc, or about 5,000 astronomical units, from Regulus A and can be seen in small telescopes. The stars share a common proper motion with Regulus A and are believed to be in orbit with a period of 125,000 years or more.
What is Regulus A?
Regulus A is a spectroscopic binary system consisting of a blue-white main sequence star and a dim companion that has not yet been seen directly, but is believed to be a white dwarf. The primary component has more recently been given the stellar classification B8 IVn, indicating a subgiant star, one almost out of its supply of hydrogen. The star has a mass 3.8 times that of the Sun and a radius about three times solar. With an effective temperature of 12,460 K, it shines with 288 solar luminosities. The star is a very fast spinner, with a projected rotational velocity of 318 km/s at the equator. Its estimated age is at least a billion years.
What constellation is Regulus in?
2019-10-08. 2021-07-10. Regulus, Alpha Leonis (α Leo), is a multiple star system located in the constellation Leo. It lies at a distance of 79.3 light years from Earth. With a combined apparent magnitude of 1.36, it is the brightest star in Leo and the 21st brightest star in the sky. It is only slightly fainter than Deneb in …
Which star is the only navigational star in Leo?
Regulus and its Leo neighbour Denebola are among the 58 bright stars that have been given a special status in the field of celestial navigation. They are the only navigational stars in Leo.
How old is Regulus?
Its estimated age is at least a billion years. Regulus (Alpha Leonis). image: Wikisky. As a result of its high rotational velocity, the star’s shape has been distorted into a highly oblate spheroid, with its equatorial diameter 32 percent larger than its diameter at the poles.
Why is Regulus eclipsed?
Because Regulus can stray within the ecliptic, or the path upon which the sun and planets travel, it is very occasionally eclipsed by one of the planets or an asteroid. For example, in 1959, Regulus was occulted by Venus. In science fiction, Regulus has been used for television series such as "Star Trek" and "Babylon 5.".
What is the brightest star in the constellation Leo?
Regulus: The Kingly Star. This sky map shows the location of brilliant planet Venus and the bright star Regulus in the pre-dawn sky on Oct. 3, 2012, as viewed from mid-northern latitudes. (Image credit: Starry Night Software) Regulus is a bright star seen in the constellation Leo. It’s the brightest star in the constellation and among …
What is Regulus Black?
Also, Regulus Black is the name of a character in the "Harry Potter" series by J.K. Rowling. He was the brother of Sirius Black, Harry’s godfather, named for the brightest star in the sky.
How far away is Regulus from Earth?
Regulus is about 70 light-years away from Earth, making it the closest star of this type to our planet, according to astronomer David Darling. It has an apparent magnitude of 1.35, making it the 21st brightest star in the night sky. Regulus’ location is: Right ascension: 10 hours 8 minutes 22.3 seconds.
Why is Regulus hotter at the poles than at the equator?
This is because the star is so distorted that it lessens gravity’s strength, which then turns down the temperature at the equator, the researchers said.
How fast does the Sun rotate?
The rotation of Regulus speeds at 700,000 mph (1.1 million kph) at its equator. (The sun’s rotation is about 4,500 mph or 7,242 kph.) The 2005 study examined the effects of the rotation for the first time using the CHARA telescope array on top of Mount Wilson in California.
How long does it take for a binary pair to orbit the Sun?
The binary pair (two dwarfs, orange and red) are about 4,200 Earth-sun distances (astronomical units, or AU) away from Regulus and take about 130,000 years to complete one orbit, Darling said.