The Sterope or Asterope system is a

double star In observational astronomy, a double star or visual double is a pair of stars that appear close to each other as viewed from Earth, especially with the aid of optical telescopes. This occurs because the pair either forms a binary star (i.e. a ...

in the

zodiac The zodiac is a belt-shaped region of the sky that extends approximately 8° north or south (as measured in celestial latitude) of the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year. The p ...

constellation of

Taurus Taurus is Latin for 'bull' and may refer to: * Taurus (astrology), the astrological sign * Taurus (constellation), one of the constellations of the zodiac * Taurus (mythology), one of two Greek mythological characters named Taurus * '' Bos taur ...

. Its components have the

Flamsteed designation A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England. They are named for John Flamsteed who first used them while c ...

s 21 Tauri and 22 Tauri, and are sometimes known as Sterope I and Sterope II, respectively. The

International Astronomical Union The International Astronomical Union (IAU; french: link=yes, Union astronomique internationale, UAI) is a nongovernmental organisation with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach ...

applies the name ''Asterope'' specifically to 21 Tauri. The two stars are thus *

21 Tauri 21 Tauri, formally known as Asterope , is a component of the Asterope double star in the Pleiades open cluster. ''21 Tauri'' is the stars' Flamsteed designation. This star is potentially faintly visible to the naked eye with an apparent v ...

(or Sterope I, formally Asterope) * 22 Tauri (or Sterope II) The two stars are separated by 0.047° on the sky, which is equal to 2.82

arc-minute A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of one degree. Since one degree is of a turn (or complete rotation), one minute of arc is of a turn. The nau ...

s and thus closer than the usual naked-eye resolution limit of 4 arc-min, giving an elongated appearance of the two together. Both are members of the

Pleiades The Pleiades (), also known as The Seven Sisters, Messier 45 and other names by different cultures, is an asterism and an open star cluster containing middle-aged, hot B-type stars in the north-west of the constellation Taurus. At a distance ...

open star cluster An open cluster is a type of star cluster made of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way galaxy, and ...

( M45) and approximately 440

light-year A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 101 ...

s from the

Sun The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared rad ...

Nomenclature

Asterope was one of the Pleiades sisters in

Greek mythology A major branch of classical mythology, Greek mythology is the body of myths originally told by the ancient Greeks, and a genre of Ancient Greek folklore. These stories concern the origin and nature of the world, the lives and activities of ...

. In 2016, the

organized a

Working Group on Star Names The International Astronomical Union (IAU) established a Working Group on Star Names (WGSN) in May 2016 to catalog and standardize List of proper names of stars, proper names for stars for the international astronomical community. It operates under ...

(WGSN) to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. It approved the name ''Asterope'' for ''21 Tauri'' on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.

Namesake

USS Sterope (AK-96) USS Sterope (AK-96) was a commissioned by the U.S. Navy for service in World War II. She was responsible for delivering troops, goods and equipment to locations in the war zone. Construction Originally named SS ''James Wilson'' (MC hull 183) ...

was a

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

Crater class cargo ship The ''Crater''-class cargo ship were converted EC2-S-C1 type, Liberty cargo ships, constructed by the United States Maritime Commission (USMC) for use by the US Navy during World War II. The designation 'EC2-S-C1': 'EC' for Emergency Cargo, '2' fo ...

named after the star.

References

{{Portal bar, Astronomy, Stars, Spaceflight, Outer space, Solar System Taurus (constellation) Pleiades Open Cluster

Sterope Sterope (; Ancient Greek: Στερόπη, , from , ''steropē'', lightning) was the name of several individuals in Greek mythology: * Sterope (or Asterope), one of the Pleiades and the wife of Oenomaus (or his mother by Ares). * Sterope, a Pleur ...

Nomenclature

Namesake

See also

References