Lambda Piscis Austrini, Latinized from λ Piscis Austrini, is a solitary

star A star is an astronomical object comprising a luminous spheroid of plasma held together by its gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night, but their immense distances from Earth make ...

in the southern constellation of

Piscis Austrinus Piscis Austrinus is a constellation in the southern celestial hemisphere. The name is Latin for "the southern fish", in contrast with the larger constellation Pisces, which represents a pair of fish. Before the 20th century, it was also known a ...

. It has a blue-white hue and is visible to the naked eye with an

apparent visual magnitude Apparent magnitude () is a measure of the brightness of a star or other astronomical object observed from Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object's lig ...

of +5.42. Based upon an annual parallax shift of 6.51 mas as measured from Earth, it is located around 500

light year A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...

s from the

Sun The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared rad ...

. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.16 due to interstellar dust. This is a

B-type main sequence star A B-type main-sequence star (B V) is a main-sequence (hydrogen-burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K. B-type stars ...

with a

stellar classification In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting t ...

of B7 V. It has an estimated 3.58 times the

mass of the Sun The solar mass () is a standard unit of mass in astronomy, equal to approximately . It is often used to indicate the masses of other stars, as well as stellar clusters, nebulae, galaxies and black holes. It is approximately equal to the mass of ...

and about 4.2 times the Sun's radius. The star is spinning with a

projected rotational velocity Stellar rotation is the angular motion of a star about its axis. The rate of rotation can be measured from the spectrum of the star, or by timing the movements of active features on the surface. The rotation of a star produces an equatorial bulge ...

of 50 km/s and is 76% of the way through its

main sequence In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Her ...

lifetime. It is radiating 249 times the

solar luminosity The solar luminosity (), is a unit of radiant flux ( power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun. One nomin ...

from its

photosphere The photosphere is a star's outer shell from which light is radiated. The term itself is derived from Ancient Greek roots, φῶς, φωτός/''phos, photos'' meaning "light" and σφαῖρα/''sphaira'' meaning "sphere", in reference to it ...

at an

effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation. Effective temperature is often used as an estimate of a body's surface temperature ...

of 12,023 K. Lambda Piscis Austrini is moving through the Galaxy at a speed of 18.1 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,800 and 29,300 light years from the center of the Galaxy.

Naming

Chinese Chinese can refer to: * Something related to China * Chinese people, people of Chinese nationality, citizenship, and/or ethnicity **''Zhonghua minzu'', the supra-ethnic concept of the Chinese nation ** List of ethnic groups in China, people of v ...

, (), meaning ''

Palace Guard ''Palace Guard'' is an American crime drama television series that was briefly broadcast by CBS from October 18 to November 1, 1991, as part of its 1991 fall lineup. It was produced by Stephen J. Cannell. Synopsis ''Palace Guard'' is the story ...

'', refers to an asterism consisting of λ Piscis Austrini, 29 Aquarii, 35 Aquarii, 41 Aquarii, 47 Aquarii,

49 Aquarii 49 Aquarii, abbreviated 49 Aqr, is a star in the zodiac constellation of Aquarius. ''49 Aquarii'' is its Flamsteed designation. It is a dim star with an apparent visual magnitude of 5.53. The distance to 49 Aqr, as determined from its an ...

, HD 212448, ε Piscis Austrini,

21 Piscis Austrini This is the list of notable stars in the constellation Piscis Austrinus, sorted by decreasing brightness. See also * List of stars by constellation References * * * * * {{Stars of Piscis Austrinus *List Piscis Austrinus Piscis Austrinus ...

20 Piscis Austrini Piscis Austrinus is a constellation in the southern celestial hemisphere. The name is Latin for "the southern fish", in contrast with the larger constellation Pisces, which represents a pair of fish. Before the 20th century, it was also known as ...

, υ Aquarii,

68 Aquarii 68 Aquarii is a single star located 270 light years away from the Sun in the zodiac constellation of Aquarius. ''68 Aquarii'' is its Flamsteed designation, though it also bears the Bayer designation of g2 Aquarii. It is visibl ...

66 Aquarii 66 Aquarii is a single star in the equatorial constellation of Aquarius. ''66 Aquarii'' is the Flamsteed designation though the star also bears the Bayer designation of g1 Aquarii.61 Aquarii 61 Aquarii, abbreviated 61 Aqr, is an orange-hued star in the zodiac constellation of Aquarius. ''61 Aquarii'' is its Flamsteed designation. It has an apparent visual magnitude of 6.39, which indicates it is a dim star that requires good ...

53 Aquarii 53 Aquarii (abbreviated 53 Aqr) is a binary star system in the equatorial constellation of Aquarius. ''53 Aquarii'' is its Flamsteed designation though the star also bears the Bayer designation of f Aquarii. The combined apparent visual ...

50 Aquarii 50 Aquarii, abbreviated 50 Aqr, is a single star in the zodiac constellation of Aquarius. ''50 Aquarii'' is its Flamsteed designation. It is a faint star with an apparent visual magnitude of 5.76 that is barely visible to the naked eye ...

56 Aquarii 56 Aquarii, abbreviated 56 Aqr, is a star in the constellation of Aquarius. ''56 Aquarii'' is its Flamsteed designation. It is a sixth magnitude star, having an apparent visual magnitude of 6.36, and thus is a challenge to view with the ...

45 Aquarii 45 Aquarii is a star in the zodiac constellation of Aquarius Aquarius may refer to: Astrology * Aquarius (astrology), an astrological sign * Age of Aquarius, a time period in the cycle of astrological ages Astronomy * Aquarius ...

58 Aquarii 58 Aquarii, abbreviated 58 Aqr, is a star in the constellation of Aquarius. ''58 Aquarii'' is its Flamsteed designation. It is a sixth magnitude star with an apparent visual magnitude of 6.39, which means it is a challenge to view with t ...

64 Aquarii 64 Aquarii is a star located 312 light years away from the Sun in the zodiac constellation of Aquarius. ''64 Aquarii'' is its Flamsteed designation. With an apparent visual magnitude of 6.93, it is too faint to be readily visible t ...

65 Aquarii 65 may refer to: * 65 (number) * ''65'' (film), an upcoming American science fiction thriller film * One of the years 65 BC, AD 65, 1965, 2065 * A type of dish in Indian cuisine, such as Chicken 65 Chicken 65 is a spicy, deep-fried chicken dish o ...

70 Aquarii 70 Aquarii is a variable star located 425 light years away from the Sun in the equatorial constellation of Aquarius. It has the variable star designation FM Aquarii; ''70 Aquarii'' is the Flamsteed designation. It is near the lower ...

74 Aquarii 74 Aquarii (abbreviated 74 Aqr) is a triple star system in the constellation of Aquarius. ''74 Aquarii'' is its Flamsteed designation and it also bears the variable star designation HI Aquarii. The combined apparent visual magnitude ...

, τ² Aquarii, τ¹ Aquarii, δ Aquarii,

77 Aquarii 77 Aquarii is a single star located 135 light years away from the Sun in the equatorial constellation of Aquarius. ''77 Aquarii'' is its Flamsteed designation. It is visible to the naked eye as a dim star with a baseline apparent vi ...

88 Aquarii 88 Aquarii (abbreviated 88 Aqr) is a star in the equatorial constellation of Aquarius. ''88 Aquarii'' is the Flamsteed designation, though it also bears the Bayer designation c2 Aquarii. In dark conditions it is visible to the naked ...

89 Aquarii 89 Aquarii (abbreviated 89 Aqr) is a binary star system in the equatorial constellation of Aquarius. ''89 Aquarii'' is the Flamsteed designation, though it also bears the Bayer designation c3 Aquarii.86 Aquarii 86 Aquarii (abbreviated 86 Aqr) is a binary star system in the celestial equator, equatorial constellation of Aquarius (constellation), Aquarius. ''86 Aquarii'' is the Flamsteed designation, though it also bears the Bayer designation c1 A ...

101 Aquarii 101 Aquarii (abbreviated 101 Aqr) is a star in the equatorial constellation of Aquarius. ''101 Aquarii'' is the Flamsteed designation, although it also bears the Bayer designation b3 Aquarii. The combined apparent visual magnitu ...

100 Aquarii 100 Aquarii is a star in the zodiac constellation of Aquarius. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. It is near the lower limit of visibility to the naked eye, appearing ...

99 Aquarii 99 Aquarii (abbreviated 99 Aqr) is a star in the equatorial constellation of Aquarius. ''99 Aquarii'' is the Flamsteed designation, although it also bears the Bayer designation b2 Aquarii. It is visible to the naked eye with an ap ...

98 Aquarii 98 Aquarii (abbreviated 98 Aqr) is a star in the celestial equator, equatorial constellation of Aquarius (constellation), Aquarius. ''98 Aquarii'' is the Flamsteed designation, although it also bears the Bayer designation b1 Aquarii. ...

, 97 Aquarii,

94 Aquarii 94 Aquarii (abbreviated 94 Aqr) is a triple star system in the celestial equator, equatorial constellation of Aquarius (constellation), Aquarius. ''94 Aquarii'' is the Flamsteed designation. The brightest member has an apparent visual ma ...

, ψ³Aquarii, ψ²Aquarii, ψ¹Aquarii,

87 Aquarii 87 may refer to: * 87 (number) * one of the years 87 BC, AD 87, 1987, 2087, etc. * Atomic number 87: francium * Intel 8087, a floating-point coprocessor See also * * List of highways numbered A ''list'' is any set of items in a row. List or ...

85 Aquarii 85 may refer to: * 85 (number) * one of the years 85 BC, AD 85, 1885, 1985, 2085 See also * * M85 (disambiguation), including "Model 85" * 1985 (disambiguation) * List of highways numbered A ''list'' is any set of items in a row. List or ...

83 Aquarii 83 Aquarii (abbreviated 83 Aqr) is a binary star system in the equatorial constellation of Aquarius. The combined apparent visual magnitude of the pair is 5.43, which is faintly visible to the naked eye. Based upon an annual parallax ...

, χ Aquarii, ω¹ Aquarii and ω² Aquarii. Consequently, the

Chinese name Chinese names or Chinese personal names are names used by individuals from Greater China and other parts of the Chinese-speaking world throughout East and Southeast Asia (ESEA). In addition, many names used in Japan, Korea and Vietnam are oft ...

for λ Piscis Austrini itself is (, en, the Sixth Star of Palace Guard.)AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日
/ref>

References

{{Stars of Piscis Austrinus, state=collapsed B-type main-sequence stars Piscis Austrini, Lambda Piscis Austrinus Durchmusterung objects Piscis Austrini, 16 210934 109789 8478