14 Andromedae

Lore & Background

14 Andromedae is a red clump giant that has passed the first-giant branch and now resides on the horizontal branch, generating energy through helium fusion in its core. It has expanded to 12.7 times the Sun's radius and radiates 58 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,483 K. Its exact mass and age remain uncertain.

In 2008, an exoplanet designated 14 Andromedae b was discovered orbiting the star via the radial velocity method. The planet has a minimum mass of 4.8 Jupiter masses and completes a circular orbit every 186 days. It is one of the few known planets orbiting an evolved intermediate-mass star and one of the closest-orbiting such planets discovered around clump giants.

In July 2014, the International Astronomical Union launched the NameExoWorlds process for giving proper names to exoplanets and their host stars. In December 2015, the winning names were announced: Veritate for the star and Spe for its planet. These names were based on submissions from the Thunder Bay Centre of the Royal Astronomical Society of Canada, originally 'Veritas' and 'Spes'—Latin for 'truth' and 'hope', respectively. The IAU substituted the ablative forms 'Veritate' and 'Spe', meaning 'where there is truth' and 'where there is hope', because 'Veritas' is the name of an asteroid important for Solar System studies. In 2016, the IAU's Working Group on Star Names recognized these names, and the star is now entered in the IAU Catalog of Star Names.

Reader's Guide

14 Andromedae holds significance as one of the relatively few known stars hosting a planet that orbits an evolved intermediate-mass star, specifically a red clump giant. Its planet, Spe, was among the first exoplanets discovered around such stars, providing insight into planetary system survival and evolution after the host star leaves the main sequence. The star's naming history reflects a broader effort by the International Astronomical Union to engage the public in exoplanet nomenclature through the NameExoWorlds campaign, resulting in the adoption of Latin-derived names with symbolic meanings of truth and hope. However, the planet's existence has been cast into doubt: a 2023 study of planets around evolved stars found that the radial velocity variations correlated with stellar activity signals, questioning whether the signal is truly planetary. A 2024 study subsequently listed 14 Andromedae b as one of several doubtful planets around giant stars, alongside other named planets such as those around 41 Lyncis and 42 Draconis. This uncertainty places 14 Andromedae in a contested category within exoplanet science, highlighting the challenges of confirming planets around active giant stars. Despite the dispute, the star remains a notable object in the constellation Andromeda, visible to the naked eye and cataloged with both its Flamsteed designation and its IAU-approved proper name.

The Chained Lady: Myth and Identity

The constellation's story is rooted in the Greek myth of Perseus. Cassiopeia, queen of Aethiopia, boasted her daughter outshone the Nereids. The offended sea nymphs petitioned Poseidon, who sent Cetus to ravage the coast. The Oracle of Ammon told Cepheus the only salvation was sacrificing Andromeda, who was chained to a seaside rock. Perseus arrived and, depending on the version, either used Medusa's severed head to petrify the monster or struck it down with a diamond sword, as Ovid's Metamorphoses relates. The couple married and, over time, produced nine children—seven sons and two daughters—and founded Mycenae with its Persideae dynasty. After her death, Athena elevated her to the sky. The constellation carries many names reflecting this narrative: "the Chained Lady" in English, Mulier Catenata in Latin, al-Mar'at al Musalsalah in Arabic, and also Persea or Cepheis. Three neighboring constellations—Perseus, Cassiopeia, and Cepheus—represent fellow characters, while Cetus retreats beyond Pisces. A Babylonian fertility goddess, sometimes called Anunitum, occupied a similar sky region before the Greek tradition took hold.

Stars, Galaxies, and the Naked-Eye Cosmos

Andromeda spans 722 square degrees, making it one of the largest constellations—over 1,400 times the full moon's apparent area, 55% the size of Hydra, and more than ten times Crux. Its brightest star, Alpheratz (Alpha Andromedae), is a binary that has also been counted toward Pegasus. Beta Andromedae, Mirach, is a red giant whose color is visible to the unaided eye, while Gamma Andromedae (Almach) is a colorful binary popular among amateur observers. The constellation's most celebrated deep-sky object is M31, the Andromeda Galaxy, visible to the naked eye and the nearest spiral galaxy to our own Milky Way. It is also one of the brightest Messier objects. Fainter companions M110 and M32 orbit nearby, and the more distant NGC 891 also falls within the boundaries. The Blue Snowball Nebula, a planetary nebula, appears as a small blue circular object through a telescope. Because of its northern declination, the constellation is visible only from latitudes north of 40° south; observers farther south never see it rise above the horizon.

Cross-Cultural Star Traditions

Long before Ptolemy catalogued Andromeda in his 2nd-century Almagest, Babylonian astronomers recognized a female figure in that region, sometimes identified as Anunitum or the Lady of the Heavens. Arab astronomers, while familiar with Ptolemy's patterns, added a second constellation—a fish overlapping Andromeda's body—whose nose was marked by the hazy patch we now know as M31. In traditional Chinese astronomy, Andromeda's stars were distributed across four distinct groupings: nine stars (including Beta, Mu, and Nu Andromedae) plus seven from Pisces formed Kui, representing a walking person's foot or a wild boar; Gamma Andromedae and neighbors became Tian Dajiangjun, Heaven's Great General; Alpha Andromedae with Gamma Pegasi made Bi, the eastern wall of the imperial palace or the emperor's library; and the northern swath formed tianjiu, a celestial stable for changing horses, while the far western portion merged with most of Lacerta into Tengshe, a flying snake. A related constellation also appears in Hindu mythology. In 1787, German astronomer Johann Bode combined stars from Andromeda and most of Lacerta into Honores Friderici, honoring King Frederick II of Prussia, though the designation quickly fell out of use.

Modern Boundaries and Observational Character

Andromeda has maintained its status as a recognized constellation since Ptolemy's time. In 1922, the International Astronomical Union assigned it the three-letter abbreviation "And," and in 1930 Belgian astronomer Eugène Delporte drew its official boundaries as a polygon of 36 segments, spanning right ascension from 22h 57.5m to 2h 39.3m and declination from 53.19° to 21.68°. The constellation is most prominent during autumn evenings in the Northern Hemisphere, sharing the sky with several other Perseus-myth characters. It is also the radiant point for the Andromedids, a weak meteor shower that peaks in November. In Ptolemy's original depiction, Alpha Andromedae marked her head, while O and Lambda Andromedae represented her chains, and Delta, Pi, Mu, Beta, and Gamma traced her body and legs—though no universal figure exists, and different traditions have always used different stars for different parts. The constellation's connection to Pegasus is notable, as Alpheratz sits on the boundary between the two.