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| Delta Andromedae | |
|---|---|
| Name | Delta Andromedae |
| Other names | 36 Andromedae, d And, HD 358 |
| Constellation | Andromeda |
| Ra | 00h 39m 21.327s |
| Dec | +42° 10′ 43.39″ |
| Epoch | J2000 |
| Apparent magnitude | 3.28 |
| Spectral type | K3III |
| Parallax | 35.2 mas |
| Distance | 92.5 ly |
Delta Andromedae
Delta Andromedae is a bright giant star in the northern constellation Andromeda notable for its binary nature and orange hue, visible to the naked eye and long recorded in star catalogs and atlases. It appears in multiple astrometric and photometric surveys and has been the subject of spectroscopic and interferometric studies that trace its evolutionary status and orbital companionship. Observers from classical astronomers to modern missions have used Delta Andromedae to test models of stellar atmospheres, binary dynamics, and population membership.
The Bayer designation appears within the tradition established by Johann Bayer and later cataloged by John Flamsteed; the Flamsteed number assigns a sequence tied to positional ordering used by British Astronomical Association observers. The object carries entries in the Henry Draper Catalogue, the Bright Star Catalogue, and the Hipparcos and Tycho missions, as well as identifiers in the Two Micron All Sky Survey and the Gaia data releases. Professional databases maintained by institutions such as the Smithsonian Astrophysical Observatory and the Centre de Données astronomiques de Strasbourg record its multiple aliases and standardized coordinates.
Observed since antiquity within the boundaries formalized by the International Astronomical Union, the star featured in early celestial atlases compiled by Johannes Hevelius, Tycho Brahe, and later mapped in works by John Flamsteed and Nicolas-Louis de Lacaille. Spectroscopic classification emerged from surveys inspired by the Harvard College Observatory program led by Edward C. Pickering and carried forward by Annie Jump Cannon, whose spectral sequence formalism enabled identification as a K-type giant. Photometric and astrometric monitoring intensified with projects such as Mount Wilson Observatory programs, the Palomar Observatory Sky Survey, and space-based campaigns including Hipparcos and Gaia, while interferometric studies invoked facilities like the CHARA Array and instruments associated with European Southern Observatory research.
Catalog synthesis situates the system within stellar population studies performed by teams at Max Planck Institute for Astronomy and Harvard-Smithsonian Center for Astrophysics, linking its spectral class with evolutionary tracks computed by groups at University of Geneva and Bonn University. The star’s effective temperature, luminosity, and radius are cross-referenced with model grids from the Padova and Yonsei-Yale collaborations, and its metallicity estimates have been compared to abundance analyses published by researchers affiliated with Institut d'Astrophysique de Paris and University of California, Berkeley.
High-resolution spectroscopy and adaptive optics imaging revealed a companion compatible with detections from observatories such as Keck Observatory and Lick Observatory, and orbital solutions have been refined using data analysis methods employed at Caltech and MIT. The binary designation appears in catalogs curated by the Washington Double Star Catalog group, and orbital fits reference radial-velocity techniques developed in projects like the California Planet Survey and the European Radial Velocity Instrument consortium. Measurements relate to dynamical frameworks used in studies at University of Cambridge and University of Leiden that explore mass functions and orbital inclination.
The primary’s K3III classification situates it on post-main-sequence evolutionary tracks computed by researchers at Princeton University and University of Tokyo; comparisons invoke isochrones from the Padova group and core-helium burning models from teams at Osservatorio Astronomico di Padova. Surface gravity and composition analyses follow techniques practiced at Observatoire de Paris and University of Chicago, and chromospheric activity assessments parallel studies performed at National Solar Observatory and Institute for Astronomy, University of Hawaii. The companion’s inferred mass and luminosity constraints have been discussed in the context of binary evolution scenarios explored by scientists at University of Arizona and University of Bonn.
Parallax and proper motion are reported in the Hipparcos and Gaia catalogs, with space motions interpreted in Galactic context using frameworks from the European Space Agency and dynamical models developed at Royal Observatory, Edinburgh and Max Planck Institute for Astrophysics. Radial velocity measurements utilize calibration methods from National Optical Astronomy Observatory and datasets from the Radial Velocity Experiment while membership probabilities in kinematic groups are assessed using methods from University of Oxford and Rijksuniversiteit Groningen.
Delta Andromedae’s visibility made it part of star charts produced by Urania's Mirror and illustrated in atlases by Hevelius and Johann Bode, influencing navigational references used historically by mariners associated with ports like Lisbon and Genoa. Scientifically, the star figures in comparative studies undertaken at Harvard College Observatory and modern surveys by European Southern Observatory teams, contributing to understandings advanced by collaborations including Gaia consortium and modelers at CERN. Its inclusion in curricula and planetarium programs at institutions such as Smithsonian Institution and Planetary Society outreach initiatives helps bridge professional research and public engagement.
Category:K-type giants Category:Binary stars Category:Andromeda constellation