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| Beta Andromedae | |
|---|---|
| Name | Beta Andromedae |
| Other names | Mirach, Mirach (Beta), BD+35°, HIP |
| Constellation | Andromeda |
| Apparent magnitude | 2.06 |
| Spectral type | M0III |
| Distance | ~200 ly |
Beta Andromedae is a bright red giant star in the constellation Andromeda noted for its role as a positional marker for deep-sky observers and navigators. It has served as a reference in historical sky charts, astrometric catalogues, and modern surveys, and appears in field guides, catalogues, and mission target lists. The star’s physical properties and circumstellar features have been examined in the context of stellar evolution, interferometry, and infrared surveys.
The traditional name Mirach appears in catalogues compiled by astronomers associated with the Royal Observatory, Greenwich, Bayer, and later by the teams behind the Henry Draper Catalogue and the Hipparcos mission. Historical records reference Mirach in works by Ptolemy and listings used by navigators from the era of Age of Discovery. Modern databases maintained by institutions such as the International Astronomical Union use multiple identifiers drawn from surveys including the Bonner Durchmusterung, the Hipparcos Catalogue, the SAO catalogue, and infrared archives produced by the IRAS mission. Professional observers cite its entries across archives maintained by the European Southern Observatory, the Space Telescope Science Institute, and the Simbad database when cross-referencing observations from facilities like the Keck Observatory, the Very Large Telescope, and the Hubble Space Telescope.
As an evolved giant, the star exemplifies phases discussed in evolutionary tracks computed by researchers at institutions such as the Max Planck Institute for Astronomy and research groups using codes developed at the Geneva Observatory and Padova Astronomical Observatory. Its photospheric temperature and luminosity are reported in surveys from the Two Micron All Sky Survey and the Gaia mission, while angular diameter measurements have been obtained with interferometers like the CHARA Array and the Mark III Stellar Interferometer. Parameters derived by teams at the Cerro Tololo Inter-American Observatory and the Mount Wilson Observatory place the star on the red giant branch consistent with models by the University of Cambridge and groups at the University of California, Berkeley. Observational campaigns from the Kitt Peak National Observatory and the National Optical Astronomy Observatory contributed radial velocity and spectral line data used in papers from research groups at the Harvard–Smithsonian Center for Astrophysics and the California Institute of Technology.
Classified as an M-class giant in catalogues produced by the Harvard College Observatory spectral surveys and later refined by spectral atlases at the European Southern Observatory, the star’s spectrum displays molecular bands and features studied by spectroscopists at the Royal Astronomical Society and laboratories at the National Institute of Standards and Technology. Photometric monitoring by projects affiliated with the American Association of Variable Star Observers and time-series analyses performed by groups at the University of Vienna and the University of Rome have characterized low-amplitude variability consistent with semiregular variables discussed in monographs from the International Astronomical Union. Data from missions such as Hipparcos and the Transiting Exoplanet Survey Satellite complement ground-based observations undertaken by observers associated with the Siding Spring Observatory and the South African Astronomical Observatory.
Parallax and proper motion measurements published by the Hipparcos Catalogue and refined by the Gaia Data Release teams yield distance and kinematic parameters that feed into Galactic models developed at the Max Planck Institute for Astrophysics and the Instituto de Astrofísica de Canarias. These astrometric results are used in population studies by research groups at the University of Tokyo and the University of Oxford examining stellar kinematics relative to structures catalogued by the Two Micron All Sky Survey and the Sloan Digital Sky Survey. Long-term radial velocity monitoring programs at the Lick Observatory and the European Southern Observatory contribute to assessments of space motion employed by Galactic archaeology teams at the Carnegie Institution for Science.
Infrared excess searches using data from IRAS, the Spitzer Space Telescope, and the Wide-field Infrared Survey Explorer have been analyzed by scientists at the Jet Propulsion Laboratory and the Max Planck Institute for Astronomy to assess dust and molecular envelopes around red giants. High-resolution imaging from adaptive optics systems on telescopes at the Keck Observatory and the Gemini Observatory constrain possible companions, and surveys coordinated by teams at the European Southern Observatory and the National Radio Astronomy Observatory have searched for maser emission and molecular lines similar to those catalogued by groups at the NRAO and the Atacama Large Millimeter/submillimeter Array. Catalog cross-matching performed by researchers at the Centre de Données astronomiques de Strasbourg and the Space Telescope Science Institute lists nearby field stars and background sources evaluated for physical association, used by exoplanet search teams at the University of Geneva.
Historically, the star has featured in star maps produced by Al-Sufi and later by European cartographers aligned with institutions like the Royal Observatory, Greenwich and the Bodleian Library. Navigators during the Age of Discovery and astronomers during the era of the Scientific Revolution used bright stars including this one in positional astronomy practiced at observatories such as the Royal Observatory, Greenwich and the Paris Observatory. Modern amateur astronomy guides from the Royal Astronomical Society and organizations such as the British Astronomical Association and the American Astronomical Society recommend the star as a pointer toward notable deep-sky objects catalogued in the Messier Catalogue and the New General Catalogue, and it appears in outreach materials from planetariums like the Hayden Planetarium and the Griffith Observatory. The star’s name and depiction occur in cultural records housed in archives at the British Library and the Bibliothèque nationale de France, and it figures in educational programs run by institutions such as the Smithsonian Institution and the National Air and Space Museum.
Category:Stars