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| Constellation Andromeda | |
|---|---|
| Name | Andromeda |
| Genitive | Andromedae |
| Abbreviation | And |
| Symbolism | Princess Andromeda |
| Rightascension | 0h to 2h |
| Declination | +20° to +50° |
| Family | Perseus |
| Quadrant | NQ1 |
| Area sq deg | 722 |
| Rank | 19th |
| Brightest star | Alpheratz (Alpha Andromedae) |
| Bf stars | 13 |
| Stars planets | 15 |
| Meteor showers | Andromedids |
| Lat max | 90° |
| Lat min | −40° |
| Best viewing | November |
Constellation Andromeda is a northern constellation located near Pegasus, Cassiopeia, and Perseus. It contains notable stars and galaxies that have been central to observations by instruments associated with Royal Greenwich Observatory, Palomar Observatory, and Arecibo Observatory. Andromeda's position and features made it prominent in catalogs compiled by Claudius Ptolemy, later refined by observers at Royal Observatory, Edinburgh and contributors to the Henry Draper Catalogue.
The name derives from the princess Andromeda in Greek myth as recounted by Hesiod, Apollodorus, and retold in works by Ovid and Pindar. Classical sources link Andromeda to the house of Cepheus and Cassiopeia, with narratives integrated into star lists by Hipparchus and catalog editions attributed to Claudius Ptolemy. Renaissance astronomers such as Johannes Hevelius and Johann Bayer standardized modern nomenclature adopted by the International Astronomical Union. The genitive form Andromedae appears in spectral catalogs like the Bonner Durchmusterung and in designations used by Harlow Shapley and Ejnar Hertzsprung.
Andromeda spans right ascension roughly 0h–2h and declination +20°–+50°, making it observable from observatories at Mount Wilson Observatory, Kitt Peak National Observatory, and La Silla Observatory. Its brightest star, Alpheratz, is cataloged in the Bright Star Catalogue and has been observed in spectroscopic surveys by teams at European Southern Observatory and Keck Observatory. Seasonal visibility peaks in November for amateur associations such as the Royal Astronomical Society and groups using equipment from American Association of Variable Star Observers. Photometric and astrometric data for Andromeda objects appear in databases maintained by NASA, European Space Agency, and Sloan Digital Sky Survey collaborators.
Primary stars in Andromeda include Alpheratz (Alpha Andromedae), Mirach (Beta Andromedae), and Almach (Gamma Andromedae), all cataloged in the Henry Draper Catalogue and studied by researchers at Mount Wilson Observatory and Yerkes Observatory. Alpheratz, formerly assigned to Pegasus, has spectral classifications published by Annie Jump Cannon and temperature estimates refined with instruments at Palomar Observatory. Mirach serves as a photometric standard in work by Gerard Kuiper and was a target in surveys by Harvard College Observatory. Almach is a binary system resolved using interferometry at CHARA Array and adaptive optics at VLT (Very Large Telescope). Numerous fainter members have exoplanet searches cataloged by projects like Kepler Mission and follow-up spectroscopy from Subaru Telescope.
The most famous deep-sky object is the Andromeda Galaxy (M31), cataloged by Charles Messier, imaged in campaigns by Edwin Hubble, and central to distance-scale work by Harlow Shapley and Henrietta Swan Leavitt. M31 and its companions M32 and M110 have been surveyed by teams at Hubble Space Telescope, Spitzer Space Telescope, and Chandra X-ray Observatory, informing models advanced by researchers at Max Planck Institute for Astronomy and California Institute of Technology. Other objects include NGC catalog entries such as NGC 891 and planetary nebulae examined by William Herschel and later by observers at Arecibo Observatory. The Andromedids meteor shower is tied to debris streams studied by investigators at Jet Propulsion Laboratory and historical analyses by Lewis Swift.
Studies of Andromeda's galaxy population, halo, and stellar streams have been conducted by collaborations involving Space Telescope Science Institute, Carnegie Institution for Science, and the Observatoire de Paris. The hierarchical assembly history of M31, inferred from work by Alan Dressler and Roeland van der Marel, draws on kinematic maps from Sloan Digital Sky Survey and metallicity measurements by teams at European Southern Observatory. Simulations by groups at Princeton University and University of Cambridge employ cosmological models linked to data from Planck (spacecraft) and inform theories developed at Institute for Advanced Study. Disk-bulge-halo decomposition and dark matter profiles in Andromeda objects intersect with studies by Vera C. Rubin Observatory collaborators.
Andromeda has appeared in star maps from Babylonian records through Al-Sufi and in navigational charts used by mariners from Viking Age sources to Age of Exploration voyages associated with Prince Henry the Navigator. Artistic depictions in Renaissance paintings by Sandro Botticelli and literary references in works by John Keats and Percy Bysshe Shelley reflect its role in European culture, while Indigenous astronomical traditions recorded by scholars at Smithsonian Institution preserve alternative interpretations. Modern outreach by institutions such as Royal Observatory Greenwich and exhibitions at Smithsonian National Air and Space Museum have popularized Andromeda science through planetarium programming and public lectures by astronomers affiliated with Harvard-Smithsonian Center for Astrophysics.
Category:Constellations