Phi Orionis
Encyclopedia
The Bayer designation
Phi Orionis (φ Ori, φ Orionis) is shared by two star system
s, φ¹ Orionis and φ² Orionis, in the constellation
Orion
. The two stars are separated by approximately 0.71° in the sky.
lying about 1000 light years
from Earth
. Phi-1 Orionis is a spectral type
B0 main sequence
star which has an apparent magnitude
of +4.39.
K0 giant
which has an apparent magnitude
of +4.09. It is about 115 light years from Earth
.
were Al Haḳʽah, "a White Spot".
The similar composition were found in Chinese astronomy, known as , meaning Turtle Beak
(asterism), Consequently, both of φ Ori themselves is known as ( the Second Star of Turtle Beak.) (for φ1Ori) and ( the Third Star of Turtle Beak.) (for φ2Ori)
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Phi Orionis (φ Ori, φ Orionis) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, φ¹ Orionis and φ² Orionis, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Orion
Orion (constellation)
Orion, often referred to as The Hunter, is a prominent constellation located on the celestial equator and visible throughout the world. It is one of the most conspicuous, and most recognizable constellations in the night sky...
. The two stars are separated by approximately 0.71° in the sky.
φ¹ Orionis
Phi-1 Orionis, is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying about 1000 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. Phi-1 Orionis is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
B0 main sequence
Main sequence
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 Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.39.
φ² Orionis
Phi-2 Orionis, is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
K0 giant
Giant star
A giant star is a star with substantially larger radius and luminosity than a main sequence star of the same surface temperature. Typically, giant stars have radii between 10 and 100 solar radii and luminosities between 10 and 1,000 times that of the Sun. Stars still more luminous than giants are...
which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.09. It is about 115 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Etymology
Both of φ Ori and λ OriLambda Orionis
Lambda Orionis is a star in the constellation Orion. It has the traditional names Meissa or Heka. "Meissa" derives from the Arabic "Al-Maisan" which means "The Shining One". This term was used for Gamma Gemini , but was somehow also mistakenly applied to λ Orionis and the name stuck...
were Al Haḳʽah, "a White Spot".
The similar composition were found in Chinese astronomy, known as , meaning Turtle Beak
Turtle Beak (Chinese constellation)
The Turtle Beak mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the western mansions of the White Tiger.-Asterisms:...
(asterism), Consequently, both of φ Ori themselves is known as ( the Second Star of Turtle Beak.) (for φ1Ori) and ( the Third Star of Turtle Beak.) (for φ2Ori)