Phi Piscium,
Latinized from φ Piscium, is a
quadruple star[ system approximately 380 ]light year
A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distance, astronomical distances and is equal to exactly , which is approximately 9.46 trillion km or 5.88 trillion mi. As defined by t ...
s away in the constellation Pisces
Pisces may refer to:
*Pisces (astrology), an astrological sign
Astronomy
*Pisces (constellation), a constellation
** Pisces Overdensity, an overdensity of stars in the Milky Way's halo that is situated in the Pisces constellation
** Pisces II, a ...
. It consists of Phi Piscium A, with a spectral type
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 the ...
of K0III, and Phi Piscium B.kelvin
The kelvin (symbol: K) is the base unit for temperature in the International System of Units (SI). The Kelvin scale is an absolute temperature scale that starts at the lowest possible temperature (absolute zero), taken to be 0 K. By de ...
s. Some suggest the only visible companion in the Phi Piscium B sub-system is a late F dwarf star
A dwarf star is a star of relatively small size and low luminosity. Most main sequence stars are dwarf stars. The meaning of the word "dwarf" was later extended to some star-sized objects that are not stars, and compact stellar remnants that are ...
, while others suggest it is a K0 star. The invisible component of the Phi Piscium B sub-system is proposed to have a spectral type of M2V. The star system has a period of about 20½ years and has a notably high eccentricity of 0.815.
Naming
In Chinese, (), meaning ''Legs
A leg is a weight-bearing and locomotive anatomical structure, usually having a columnar shape. During locomotion, legs function as "extensible struts". The combination of movements at all joints can be modeled as a single, linear element cap ...
(asterism)'', refers to an asterism consisting of refers to an asterism consisting of φ Piscium, η Andromedae, 65 Piscium
This is the list of notable stars in the constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythologi ...
, ζ Andromedae, ε Andromedae, δ Andromedae
Delta Andromedae is a triple star system in the northern constellation of Andromeda (constellation), Andromeda. Its identifier is a Bayer designation that is Romanization of Greek, Latinized from δ Andromedae, and abbreviated Delta ...
, π Andromedae, ν Andromedae, μ Andromedae
Mu Andromedae is a binary star system in the northern constellation of Andromeda (constellation), Andromeda. Its Bayer designation is Romanization of Greek, Latinized from μ Andromedae, and abbreviated Mu And or μ And, r ...
, β Andromedae, σ Piscium
Sigma Piscium (Sigma Psc, σ Piscium, σ Psc) is a binary star in the zodiac constellation of Pisces. It has an apparent magnitude of +5.50, meaning it is barely visible to the naked eye, according to the Bortle scale ...
, Ï„ Piscium
Tau Piscium (Ï„ Piscium) is an orange-hued star in the zodiac constellation of Pisces. With an apparent visual magnitude of +4.52, it is a dim star but visible to the naked eye. Based upon an annual parallax shift of 19.32 ...
, 91 Piscium, υ Piscium, χ Piscium and ψ¹ Piscium. Consequently, φ Piscium itself is known as (, .)AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
References
{{DEFAULTSORT:Phi Piscium
K-type giants
Spectroscopic binaries
4
Pisces (constellation)
Piscium, Phi
Piscium, 085
007318
005742
0360
Durchmusterung objects