Astronomy and Space

31 Lyncis

31 Lyncis is the fourth-brightest star in the constellation of Lynx. It has the traditional name Alsciaukat, pronounced . The orange-hued star is visible to the naked eye with a baseline apparent visual magnitude of +4.25. It is a single star located about 380 light years away from the Sun, based on parallax, and is moving further away with a heliocentric radial velocity of +25 km/s. This object is an aging giant star with a stellar classification of K4+ III. A 1993 study found that it varied in brightness by 0.05 magnitude over 25 to 30 days. On the other hand, a 2002 study of the Hipparcos data found a period of 3.5 days. It is classified as a semiregular variable with a brightness that ranges from 4.21 to as low as 4.27, and has the variable star designation BN Lyncis. 31 Lyncis is 1.3 billion years old with almost double the mass of the Sun. With the supply of hydrogen at its core exhausted, the star has expanded to 53 times the Sun's radius. It is radiating around 782 times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,921 K.

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See also

• ▸Helios Dust Instrumentation
• ▸HMS Amazon (1799)
• ▸Altair (spacecraft)

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