What kind of star is Achemar?

It is a binary star with a B-type star, Achernar A, as its primary and a much fainter A-type star, Achernar B, orbiting the primary at a distance of 6.7 astronomical units (1 billion km, or 621 million miles) with a period of about 15 years.

1. Is Achernar a binary star?
2. Is Achernar a giant?
3. What is the flattest star?
4. What is achernar Bayer designation?
5. Is Pollux the North star?
6. What is Betelgeuse luminosity?
7. Is Achernar visible from Earth?
8. Is achernar a blue giant?
9. How long will achernar last?
10. Why is achernar oval?

Is Achernar a binary star?

Achernar is a bright, binary star system in the constellation Eridanus, and is the ninth-brightest star in Earth's night sky. The two stars, Achernar A (seven times the mass of the sun) and Achernar B (which is smaller), rotate about 6.7 Earth-sun distances or astronomical units apart.

Is Achernar a giant?

Located about 139 light years away as determined by the Hipparcos satellite, Archenar is blue-white supergiant star (B3 Vpe) about seven times as massive as the Sun, and at least 1,350 times as luminous.

What is the flattest star?

Very precise measurements show that the hot, bright star Achernar is the flattest known.

What is achernar Bayer designation?

Achernar (ā´kərnär´), brightest star in the constellation Eridanus; Bayer designation α Eridani; 1992 position R.A. 1^h37.4^m, Dec. -57°16′. A bluish-white white star with apparent magnitude 0.51, it is one of the 10 brightest stars in the entire sky.

Is Pollux the North star?

At an apparent visual magnitude of 1.14, Pollux is the brightest star in its constellation, even brighter than its neighbor Castor (α Geminorum). Pollux is 6.7 degrees north of the ecliptic, presently too far north to be occulted by the moon and planets.

What is Betelgeuse luminosity?

Betelgeuse's luminosity is 100,000-times that of the Sun. However, its surface is also cooler – 3,600 K versus the Sun's 5,800 K – so only about 13% of its radiant energy is emitted as visible light. Traditionally, Betelgeuse is classified as a pulsating variable star.

Is Achernar visible from Earth?

On most nights of the year, Achernar cannot be seen from anywhere in North America. However, around October 20 it skirts the southern horizon around midnight, never getting very high. Then as the months pass, it is seen earlier at night – around 10 p.m. in November, 8 p.m. in December and just after sunset in January.

Is achernar a blue giant?

Achernar is a blue main-sequence star with a stellar classification of B6 Vep. It is a spectral type B star. Achernar is the brightest star in the constellation of Eridanus and the ninth brightest star in the night sky. Out of the ten brightest stars in the sky, Achernar is the hottest and bluest in color.

How long will achernar last?

It is now normally fusing hydrogen into helium in its deep core and will eventually die as a massive white dwarf like Sirius B. All this action is watched by a close companion that averages roughly a dozen Astronomical Units away from Achernar proper with an orbital period estimated to be around 12 years.

Why is achernar oval?

The separation of the two stars is roughly 12.3 AU and their orbital period is at least 14–15 years. As of 2003, Achernar is the least spherical star in the Milky Way studied to date. It spins so rapidly that it has assumed the shape of an oblate spheroid with an equatorial diameter 56% greater than its polar diameter.