meissa

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      Meissa , designated Lambda Orionis (λ Orionis, abbreviated Lambda Ori, λ Ori) is a star in the constellation of Orion. It is a multiple star approximately 1,300 ly away with a combined apparent magnitude of 3.33. The main components are an O8 giant star and a B-class main sequence star, separated by about 4″. Despite Meissa being more luminous and only slightly further away than Rigel, it appears 3 magnitudes dimmer at visual wavelengths, with much of its radiation emitted in the ultraviolet due to its high temperature.


      Nomenclature



      Lambda Orionis is the star's Bayer designation. The traditional name Meissa derives from the Arabic Al-Maisan which means 'The Shining One'. Al-Maisan was originally used for Gamma Geminorum, but was mistakenly applied to Lambda Orionis and the name stuck. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included Meissa for this star. It is now so entered in the IAU Catalog of Star Names.
      The original Arabic name for this star, Al Hakah (the source for another name for it, Heka) refers to the Arabic lunar mansion that includes this star and the two of Phi Orionis (Al Haḳʽah, 'a White Spot'). In Chinese, 觜宿 (Zī Sù), meaning Turtle Beak, refers to an asterism consisting of Meissa and both of Phi Orionis Consequently, the Chinese name for Meissa itself is 觜宿一 (Zī Sù yī, English: the First Star of Turtle Beak.)


      Properties


      Meissa is a giant star with a stellar classification of O8 III and an apparent visible magnitude 3.54. It is an enormous star with about 34 times the mass of the Sun and 10 times the Sun's radius. The outer atmosphere has an effective temperature of around 35,000 K, giving it the characteristic blue glow of a hot O-type star. Meissa is a soft X-ray source with a luminosity of 1032 erg s−1 and peak emission in the energy range of 0.2–0.3 keV, which suggests the X-rays are probably being generated by the stellar wind. The stellar wind of Meissa is well characterized by a mass-loss rate of 2.5×10−8 solar masses per year and a terminal velocity of 2,000 km/s.
      Meissa is actually a double star with a companion at an angular separation of 4.41 arcseconds along a position angle of 43.12° (as of 1937). This fainter component is of magnitude 5.61 and it has a stellar classification of B0.5 V, making it a B-type main sequence star. There is an outlying component, Meissa C, which is an F-type main sequence star with a classification of F8 V. This star in turn may have a very low mass companion that is probably a brown dwarf.
      In 2018, a companion was detected around Meissa A, with a project separation of 10.13 mas. However, it was not detected again.


      Ring



      Meissa is surrounded by a ring of nebulosity about 12 degrees across. It is thought to be the remains of a supernova explosion, now ionized by the ultraviolet radiation from Meissa itself and some of the surrounding hot stars.


      Cluster


      This star is the dominant member of a 5-million-year-old star-forming region known as the λ Orionis cluster, or Collinder 69. The intense ultraviolet energy being radiated by this star is creating the Sh2-264 H II region in the neighboring volume of space, which in turn is surrounded by an expanding ring of cool gas that has an age of about 2–6 million years. The expansion of this gaseous ring may be explained by a former binary companion of Meissa that became a Type II supernova. Such an event would also explain the star's peculiar velocity with respect to the center of the expanding ring, as the explosion and resulting mass loss could have kicked Meissa out of the system. A potential candidate for the supernova remnant is the neutron star Geminga. However, the last is unlikely given the distance between Geminga and the cluster.


      Gallery













      References

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    Meissa - Wikipedia

    Meissa is a giant star with a stellar classification of O8 III and an apparent visible magnitude 3.54. It is an enormous star with about 34 [ 7 ] times the mass of the Sun and 10 times the Sun's radius.

    Meissa: Live Attenuated Vaccines for RSV and COVID-19

    Meissa is developing live attenuated vaccine candidates against life threatening respiratory viruses, including respiratory syncytial virus (RSV), SARS-CoV-2 (COVID-19), and human metapneumoviru­­s (hMPV).

    Meissa (Lambda Orionis): Star System, Name, Constellation

    Sep 14, 2019 · Meissa, Lambda Orionis (λ Ori), is the star that marks the head of Orion, the Hunter. It is a multiple star system with a combined apparent magnitude of 3.33, located at an approximate distance of 1,100 light years from Earth. Meissa is the 11th brightest star in Orion.

    Meissa (λ Orionis) | Facts, Information, Distance, History & Definition

    Jul 14, 2020 · Meissa, designated as Lambda Orionis, is a multiple star system situated in the constellation of Orion. The main components of the Meissa star system are an O8 giant star and a B-class main-sequence star. The primary star, Meissa, is a giant star of stellar classification O8 II.

    Meissa. - Constellations of Words

    The history of the star: Meissa. from p.318 of Star Names, Richard Hinckley Allen, 1889. [A scanned copy can be viewed on this webpage. Lambda (λ) Orion, Meissa, is a double star, 3.7 and 6, pale white and violet, in the Hunter’s head.

    Meissa - λ Orionis (lambda Orionis) - Star in Orion - TheSkyLive

    Meissa, also designated as λ Orionis, is a variable and multiple giant star of magnitude 3.54 in the constellation of Orion. Find complete information about Meissa on TheSkyLive.com.

    Meissa - National Radio Astronomy Observatory

    Meissa, which comes from the Arabic for "white spot" or "shining," is the star that occupies where one would imagine Orion has his head. The star is young, hot, and massive.

    Meissa - University of Illinois Urbana-Champaign

    MEISSA (Lambda Orionis). One of the fainter stars to carry a proper name, Meissa is the Lambda star of Orion. At faint third magnitude (3.5), Meissa is not important in star-lore for its brightness, but for its position, as (with a pair of other stars) it marks the head of the ancient Hunter.

    Vaccine Pipeline: RSV and Intranasal COVID-19 Vaccine Candidates - Meissa

    Meissa is dedicated to creating safe, potent, stable, and accessible intranasal live viral vaccines that can prevent infection and disease. Meissa’s RSV and COVID-19 live attenuated vaccine candidates were developed using the company’s A ttenuBlock platform.

    Meissa Star Facts (Lambda Orionis) - Universe Guide

    Meissa (Lambda Orionis) is a blue star in the constellation of Orion. It can be seen in the night sky. Meissa distance from Earth is 1098.19 light years away.