Mrigashira Nakshatra(Bellatrix (Gamma-Orionis), Pi2, Pi3, and Pi4-Orionis)
Mrigasira (Face of the deer) (53°20′ to 60° 00 Taurus & 60° 00 to 66°40′ Gemini)
In the night sky, Mrigasira consists of four stars located in the constellation of Orion: Bellatrix (Gamma-Orionis), Pi2, Pi3, and Pi4-Orionis.
Bellatrix is the brightest of these stars and is located on the right shoulder of Orion. These stars form the shape of a deer’s head, which is the symbol of Mrigasira. In the astrology chart, Mrigasira bridges the signs Taurus and Gemini.
Bellatrix or Gamma Orionis is the 3rd brightest naked eye star in the constellation Orion. With an apparent magnitude of 1.64, Bellatrix is the 26th brightest star in the entire sky (see: 50 Brightest Stars ). Its absolute magnitude is -2.72 and its distance is 243 light years.
Bellatrix has a spectral type of B2III, a surface temperature of 21,500° Kelvin and a luminosity 4000 times the Sun. It has a mass of 8 solar masses and a diameter 5.7 times the Sun.
Bellatrix is a massive blue-white star (spectral type B2 III) with an effective temperature of 22,000° K, making it considerably hotter than the Sun (5,778° K). With a mass 8.4 times the Sun's mass, it has an estimated age of approximately 20 million years. This is long enough for a star of this mass to consume the hydrogen at its core and begin to evolve away from the main sequence into a giant star. The measured angular diameter of Gamma Orionis, after correction for limb darkening, is 0.72 milliarcseconds. At an estimated distance of 250 light years (77 parsecs), this yields a physical size of about 6 times the radius of the Sun.
Pi2 Orionis (π2 Ori, π2 Orionis) is the Bayer designation for a solitary star in the equatorial constellation of Orion. Although the Bright Star Catalogue lists this as a spectroscopic binary star system,this does not appear to be the case.
It is visible to the naked eye with an apparent visual magnitude of 4.35. Based upon an annual parallax shift of 14.53 mas, it is located roughly 224 light years away from the Sun.This is an A-type main sequence star with a stellar classification of A1 Vn, where the 'n' indicates broad absorption lines due to rotation.
It is spinning rapidly with a projected rotational velocity of 261.4 km/s.This is giving the star an oblate shape with an equatorial bulge that is 13% larger than the polar radius.
It is shining with 70 times the solar luminosity from its outer atmosphere at an effective temperature of 9,457 K.
Pi4 Orionis (π4 Ori, π4 Orionis) is a binary star system in the western part of the Orion constellation. It is visible to the naked eye with an apparent visual magnitude of 3.7.Based upon an annual parallax shift of 3.1 mass,it is located roughly 1,050 light years from the Sun.
This is a spectroscopic binary star system with an orbital period of 9.5 days and an eccentricity of 0.03.The primary component is a B-type star with a stellar classification of B2 III.The stellar spectrum of π4 Ori A shows a strong depletion of the element boron.
It has nearly 11times the mass of the Sun and 9 times the Sun's radius. The star is 15.4million years old and has a projected rotational velocity of 38 km/s.It shines with 19,726times the solar luminosity from its outer atmosphere at an effective temperature of 21,874 k.
Pi3 Orionis came to within 15 light-years of Sol about 210,000 years ago.
The star was identified one of the top 10 target stars for NASA's indefinitely postponed Terrestrial Planet Finder
This star is a white-yellow main sequence dwarf star of spectral and luminosity type F6 V, with almost 1.3 times Sol's mass , 1.2 to 1.3 times its diameter and over 2.6 times of its bolometric luminosity . It may be anywhere from 20 to 151 percent as enriched as Sol with elements heavier than hydrogen , based on its abundance of iron . With a rotational period of 3.9 days, Pi3 Orionis A may be around 1.4 to 2.2 billion years old .
Astrology point of view:
Source: Wikipedia
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In the night sky, Mrigasira consists of four stars located in the constellation of Orion: Bellatrix (Gamma-Orionis), Pi2, Pi3, and Pi4-Orionis.
Bellatrix is the brightest of these stars and is located on the right shoulder of Orion. These stars form the shape of a deer’s head, which is the symbol of Mrigasira. In the astrology chart, Mrigasira bridges the signs Taurus and Gemini.
Bellatrix or Gamma Orionis is the 3rd brightest naked eye star in the constellation Orion. With an apparent magnitude of 1.64, Bellatrix is the 26th brightest star in the entire sky (see: 50 Brightest Stars ). Its absolute magnitude is -2.72 and its distance is 243 light years.
Bellatrix has a spectral type of B2III, a surface temperature of 21,500° Kelvin and a luminosity 4000 times the Sun. It has a mass of 8 solar masses and a diameter 5.7 times the Sun.
Bellatrix is a massive blue-white star (spectral type B2 III) with an effective temperature of 22,000° K, making it considerably hotter than the Sun (5,778° K). With a mass 8.4 times the Sun's mass, it has an estimated age of approximately 20 million years. This is long enough for a star of this mass to consume the hydrogen at its core and begin to evolve away from the main sequence into a giant star. The measured angular diameter of Gamma Orionis, after correction for limb darkening, is 0.72 milliarcseconds. At an estimated distance of 250 light years (77 parsecs), this yields a physical size of about 6 times the radius of the Sun.
Pi2 Orionis (π2 Ori, π2 Orionis) is the Bayer designation for a solitary star in the equatorial constellation of Orion. Although the Bright Star Catalogue lists this as a spectroscopic binary star system,this does not appear to be the case.
It is visible to the naked eye with an apparent visual magnitude of 4.35. Based upon an annual parallax shift of 14.53 mas, it is located roughly 224 light years away from the Sun.This is an A-type main sequence star with a stellar classification of A1 Vn, where the 'n' indicates broad absorption lines due to rotation.
It is spinning rapidly with a projected rotational velocity of 261.4 km/s.This is giving the star an oblate shape with an equatorial bulge that is 13% larger than the polar radius.
It is shining with 70 times the solar luminosity from its outer atmosphere at an effective temperature of 9,457 K.
Pi4 Orionis (π4 Ori, π4 Orionis) is a binary star system in the western part of the Orion constellation. It is visible to the naked eye with an apparent visual magnitude of 3.7.Based upon an annual parallax shift of 3.1 mass,it is located roughly 1,050 light years from the Sun.
This is a spectroscopic binary star system with an orbital period of 9.5 days and an eccentricity of 0.03.The primary component is a B-type star with a stellar classification of B2 III.The stellar spectrum of π4 Ori A shows a strong depletion of the element boron.
It has nearly 11times the mass of the Sun and 9 times the Sun's radius. The star is 15.4million years old and has a projected rotational velocity of 38 km/s.It shines with 19,726times the solar luminosity from its outer atmosphere at an effective temperature of 21,874 k.
Pi3 Orionis came to within 15 light-years of Sol about 210,000 years ago.
The star was identified one of the top 10 target stars for NASA's indefinitely postponed Terrestrial Planet Finder
This star is a white-yellow main sequence dwarf star of spectral and luminosity type F6 V, with almost 1.3 times Sol's mass , 1.2 to 1.3 times its diameter and over 2.6 times of its bolometric luminosity . It may be anywhere from 20 to 151 percent as enriched as Sol with elements heavier than hydrogen , based on its abundance of iron . With a rotational period of 3.9 days, Pi3 Orionis A may be around 1.4 to 2.2 billion years old .
Astrology point of view:
mṛgaśiraṣa (popularly spelled Mārgaśīrṣa/Mṛgaśira)the 5th nakṣatra or lunar mansion as used in Hindu astronomy and astrology is the constellation Orion. Its position is described in the Surya Siddhānta.
The first two carana/pada (quarters) of this nakṣatra are part of Vṛṣabha Rāśi or Taurus. The latter half of this star belong to Mithuna Rāśi or Gemini (from 23°20’ Taurus to 6°40’ Gemini). stars in λ, φ1, φ2 Orionis
Read also : Lunar station and Nakshatras Source: Wikipedia
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