"in their constellations and among the 25–brightest stars in the night sky. The Persians considered these stars to be the four guardians of the heavens. They marked the seasonal changes and marked the equinoxes and solstices. Aldebaran watched the Eastern sky and was the dominant star in the Taurus constellation, Regulus watched the North and was the dominant star in the Leo constellation, Antares watched the West and was the alpha star in Scorpio, and Fomalhaut watched the Southern sky and was the brightest star in Piscis Austrinus (sharing the same longitude with the star Sadalmelik which is the predominant"
"star Regulus from Vibo Valentia, Italy. ""Rhodope""s spectral type is ambiguous. In the Tholen classification, the noisy spectrum is closest to a G-type and somewhat similar to a common C-type (GC:). In the SMASS classification, it is an Xe-subtype, that transitions from the X-type to the very bright E-type. In addition, ""Rhodope"" has also been characterized as a primitive P-type and carbonaceous C-type by the Wide-field Infrared Survey Explorer (WISE) and by Pan-STARRS photometric survey, respectively. Two well-defined rotational lightcurves of ""Rhodope"" were obtained from photometric observations by French astronomer Matthieu Conjat and by an anonymous observer of the ""Collaborative"
"M4V. The companion pair has an orbital period of about 600 years with a separation of 2.5"" in 1942. The Regulus system as a whole is the twenty-first brightest star in the night sky with an apparent magnitude of +1.35. The light output is dominated by Regulus A. Regulus B, if seen in isolation, would be a binocular object of magnitude +8.1, and its companion, Regulus C, the faintest of the three stars that has been directly observed, would require a substantial telescope to be seen, at magnitude +13.5. Regulus A is itself a spectroscopic binary: the secondary star has"
"the Yellow Emperor. In Hindu astronomy, Regulus corresponds to the Nakshatra Magha (""the bountiful""). Babylonians called it ""Sharru"" (""the King""), and it marked the 15th ecliptic constellation. In India it was known as ""Maghā"" (""the Mighty""), in Sogdiana ""Magh"" (""the Great""), in Persia ""Miyan"" (""the Centre"") and also as ""Venant"", one of the four 'royal stars' of the Persian monarchy. It was one of the fifteen Behenian stars known to medieval astrologers, associated with granite, mugwort, and the kabbalistic symbol . In the Babylonian MUL.APIN, Regulus is listed as LUGAL, meaning ""the star that stands in the breast of the"
"heliacal rising of Regulus occurs in the first week of September. Every 8 years, Venus passes Regulus around the time of the star's heliacal rising, as on 5 September 2014. Regulus is a multiple star system consisting of at least four stars. Regulus A is the dominant star, with a binary companion 177"" distant that is thought to be physically related. Regulus D is a 12th magnitude companion at 212"", but is apparently an unrelated background object. Regulus A is a binary star consisting of a blue-white main sequence star of spectral type B7V, which is orbited by a star"
"to ""Alpha Leonis"") is the star's Bayer designation. The traditional name ""Rēgulus"" is Latin for 'prince' or 'little king'. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included ""Regulus"" for this star. It is now so entered in the IAU Catalog of Star Names. Regulus is 0.47 degree from the ecliptic, the closest of the bright stars, and is regularly occulted by the Moon."
"photosphere at Regulus' poles is considerably hotter, and five times brighter per unit surface area, than its equatorial region. The star's surface at the equator rotates at about 320 kilometres per second (199 miles per second), or 96.5% of its critical angular velocity for break-up. It is emitting polarized light because of this. Regulus BC is 5,000 AU from Regulus A. They share a common proper motion and are thought to orbit each other. Designated Regulus B and Regulus C, the pair has Henry Draper Catalogue number HD 87884. The first is a K2V star, while the companion is approximately"
"Rho Leonis Rho Leonis (ρ Leo) is a binary star in the zodiac constellation of Leo, and, like the prominent nearby star Regulus, is near the ecliptic. With an apparent visual magnitude of 3.9, this star can be readily seen with the naked eye. Parallax measurements give a distance estimate of about from the Earth. This is an enormous star with about 21 times the Sun's mass () and 37 times the Sun's radius. Its spectrum matches a stellar classification of B1 Iab, with the 'Iab' luminosity class indicating that it is in the supergiant stage of its evolution. Rho"
"Omicron Leonis Omicron Leonis (ο Leonis, abbreviated Omicron Leo, ο Leo) is a multiple star system in the constellation of Leo, west of Regulus, some 130 light-years from the Sun, where it marks one of the lion's forepaws. It consists of a binary pair, designated Omicron Leonis A and an optical companion, Omicron Leonis B. 'A's' two components are themselves designated Omicron Leonis Aa (also named Subra) and Ab. ""ο Leonis"" (Latinised to ""Omicron Leonis"") is the star's Bayer designation. The designations of the two constituents as ""Omicron Leonis A"" and ""B"", and those of ""A's"" components - ""Omicron Leonis"
"with modern observations. Rho Leonis Rho Leonis (ρ Leo) is a binary star in the zodiac constellation of Leo, and, like the prominent nearby star Regulus, is near the ecliptic. With an apparent visual magnitude of 3.9, this star can be readily seen with the naked eye. Parallax measurements give a distance estimate of about from the Earth. This is an enormous star with about 21 times the Sun's mass () and 37 times the Sun's radius. Its spectrum matches a stellar classification of B1 Iab, with the 'Iab' luminosity class indicating that it is in the supergiant stage of"
"the constellation of Sextans. It is located 4.44 million light years away from Earth. DDO 74 (also known as Leo I, Regulus Dwarf, PGC 29488 or UGC 5470) lies approximately 820,000 light years away in the constellation Leo. It is one of the most distant satellite galaxy of our Milky Way. The dwarf spheroidal galaxy is located only 12 arcminutes from Regulus (α Leonis), and the light from Regulus makes the visibility of DDO 74 becomes poor, so it is difficult to be observed. DDO 75 (also known as Sextans A, PGC 29653 or UGCA 205) is an irregular galaxy"
"Norma (constellation) Norma is a small constellation in the Southern Celestial Hemisphere between Ara and Lupus, one of twelve drawn up in the 18th century by French astronomer Nicolas-Louis de Lacaille and one of several depicting scientific instruments. Its name is Latin for normal, referring to a right angle, and is variously considered to represent a rule, a carpenter's square, a set square or a level. It remains one of the 88 modern constellations. Four of Norma's brighter stars—Gamma, Delta, Epsilon and Eta—make up a square in the field of faint stars. Gamma Normae is the brightest star with an"
"the star Regulus (α Leonis) and constellations Leo and Lynx, of which the latter is said to represent the body of the Yellow Dragon. He corresponds to the ""Huángshén Běidǒu"" (黄神北斗 ""Yellow God of the Northern Dipper""), of whom in certain historical sources he is described as the human form making an ontological distinction between the two. For instance, according to a definition given by apocryphal texts related to the ""Hétú"" 河圖, the Yellow Emperor ""proceeds from the essence of the Yellow God of the Northern Dipper"", is born to ""a daughter of a chthonic deity"", and as such he"
"is given the type F8-G0III giant and the secondary is a type A7m dwarf. Their combined apparent magnitude is +3.52. Omicron Leonis Omicron Leonis (ο Leonis, abbreviated Omicron Leo, ο Leo) is a multiple star system in the constellation of Leo, west of Regulus, some 130 light-years from the Sun, where it marks one of the lion's forepaws. It consists of a binary pair, designated Omicron Leonis A and an optical companion, Omicron Leonis B. 'A's' two components are themselves designated Omicron Leonis Aa (also named Subra) and Ab. ""ο Leonis"" (Latinised to ""Omicron Leonis"") is the star's Bayer designation."
"Omicron Draconis Omicron Draconis (Latinised as ο Draconis, abbreviated to ο Dra) is a giant star in the constellation Draco located 322.93 light years from the Earth. It has a radius of 30 solar radii, and a luminosity of 269 suns. Its path in the night sky is circumpolar above the ecliptic, meaning the star never rises or sets when viewed in the night sky from certain positions in the northern hemisphere. Omicron Draconis can be considered the north pole star of Mercury, as it is the closest star to Mercury's north celestial pole. This is a single-lined spectroscopic binary"
"Occultations by the planets Mercury and Venus are possible but rare, as are occultations by asteroids. The last occultation of Regulus by a planet was on July 7, 1959, by Venus. The next will occur on October 1, 2044, also by Venus. Other planets will not occult Regulus over the next few millennia because of their node positions. An occultation of Regulus by the asteroid 166 Rhodope was observed by 12 researchers from Portugal, Spain, Italy, and Greece on October 19, 2005. Differential bending of light was measured to be consistent with general relativity. Regulus was occulted by the asteroid"
"Règle"" to ""le Niveau"", ""the level"". In any case, the constellation's name had been shortened and Latinised by Lacaille to ""Norma"" by 1763. Norma is bordered by Scorpius to the north, Lupus to the northwest, Circinus to the west, Triangulum Australe to the south and Ara to the east. Covering 165.3 square degrees and 0.401% of the night sky, it ranks 74th of the 88 constellations in size. The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is 'Nor'. The official constellation boundaries, as set by Eugène Delporte in 1930, are defined by a"
"Pollux (star) Pollux, also designated Beta Geminorum (β Geminorum, abbreviated Beta Gem, β Gem), is an orange-hued evolved giant star approximately 34 light-years from the Sun in the northern constellation of Gemini. It is the brightest star in the constellation of Gemini and the closest giant star to the Sun. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. In 2006, an extrasolar planet (designated Pollux b or β Geminorum b, later named Thestias) was confirmed to be orbiting it. ""β Geminorum"" (Latinised to ""Beta Geminorum"") is"
"constellations. Another readily identifiable constellation is Leo, above the Holy Family, with its brightest star, Regulus, in the centre of the picture. It has been proposed that Elsheimer reworked the painting in 1610, after the publication of Galileo's Sidereus Nuncius, which showed the Milky Way as composed of individual stars and showed the moon's surface in unprecedented detail. This hypothesis has been contested by Elsheimer scholar Keith Andrews. In addition to disclosing Elsheimer's interest in scientific topics, the appearance of the Milky Way has a spiritual connotation—it symbolized the path to heaven beginning in the Middle Ages. Elsheimer's sky, wrote"
"with Cor Caroli. Spring Triangle The Spring Triangle is an astronomical asterism involving an imaginary triangle drawn upon the celestial sphere, with its defining vertices at Arcturus, Spica, and Regulus. This triangle connects the constellations of Boötes, Virgo, and Leo. It is visible rising in the south eastern sky of the northern hemisphere between March and May. George Lovi of Sky & Telescope magazine had a slightly different ""Spring triangle"", including the tail of Leo, Denebola, instead of Regulus. Denebola is dimmer, but the triangle is more nearly equilateral. These stars form parts of a larger Spring asterism called the"
"Omega Draconis Omega Draconis, Latinized from ω Draconis and also known as 28 Draconis, is a binary star in the constellation of Draco. The system is fairly close, and is located about 76 light-years (23 parsecs) away, based on its parallax. Omega Draconis is a spectroscopic binary, which means the two stellar components are too close to be resolved but periodic Doppler shifts in their spectra indicate orbital motion. In this case, light from both stars can be detected, and it is a double-lined spectroscopic binary. The orbital period of the system is 5.28 days, and the eccentricity of the"
"Reticulum Reticulum is a small, faint constellation in the southern sky. Its name is Latin for a small net, or reticle—a net of crosshairs at the focus of a telescope eyepiece that is used to measure star positions. The constellation is best viewed between October and December, but cannot be seen from middle to northern latitudes. A constellation in this area was introduced by Isaac Habrecht II in his celestial globe in 1621, who named it ""Rhombus"". It was replaced with a somewhat different constellation by the French astronomer Nicolas Louis de Lacaille in the eighteenth century; during his stay"
"Crater class cargo ship named after the star. \end{align}</math></ref> Lambda Draconis Lambda Draconis (λ Draconis, abbreviated Lam Dra, λ Dra), also named Giausar, is a solitary, orange-red star in the northern circumpolar constellation of Draco. It is visible to the naked eye with an apparent visual magnitude of +3.85. Based upon an annual parallax shift of 9.79 mas as seen from the Earth, the star is located around 333 light years from the Sun. This is an evolved red giant star on the asymptotic giant branch with a stellar classification of M0III-IIIa Ca1. It is a suspected slow irregular variable"
"star in Aquarius). Aldebaran marked the vernal equinox and Antares marked the autumnal equinox, while Regulus marked the Summer Solstice and Fomalhaut the Winter Solstice. While watching the sky, the dominant star would appear in its season, each having a time of the year when most noticeable. Regulus was seen as the main star because it was in the constellation of Leo, giving it the power of the lion, signifying the strength of kings with large implications. The constellations of the Royal Stars were said to be fixed because their positions were close to the four fixed points of the"
"Lambda Draconis Lambda Draconis (λ Draconis, abbreviated Lam Dra, λ Dra), also named Giausar, is a solitary, orange-red star in the northern circumpolar constellation of Draco. It is visible to the naked eye with an apparent visual magnitude of +3.85. Based upon an annual parallax shift of 9.79 mas as seen from the Earth, the star is located around 333 light years from the Sun. This is an evolved red giant star on the asymptotic giant branch with a stellar classification of M0III-IIIa Ca1. It is a suspected slow irregular variable with a periodicity of roughly 1,100 days. The measured"
"of at least 0.3 solar masses, which is probably a white dwarf. The two stars take approximately 40 days to complete an orbit around their common centre of mass. Given the extremely distorted shape of the primary, the relative orbital motion may be notably altered with respect to the two-body purely Keplerian scenario because of non-negligible long-term orbital perturbations affecting, for example, its orbital period. In other words, Kepler's third law, which holds exactly only for two point-like masses, would no longer be valid for the Regulus system. Regulus A was long thought to be fairly young, only 50 –"
"its highly distorted shape may cause non-negligible departures of the companion's orbital trajectory with respect to a Keplerian ellipse. A similar situation occurs for the star Regulus. Because of the distorted shape of this star, there is a significant temperature variation by latitude. At the pole, the temperature may be above 20,000 K, while the equator is at or below 10,000 K. The average temperature of the star is about 15,000 K. The high polar temperatures are generating a fast polar wind that is ejecting matter from the star, creating a polar envelope of hot gas and plasma. The entire"
"Sceptrum et Manus Iustitiae Sceptrum et Manus Iustitiae (Latin for ""scepter and hand of justice"") was a constellation created by Augustin Royer in 1679 to honor king Louis XIV of France. It was formed from stars of what is today the constellations Lacerta and western Andromeda. Due to the awkward name the constellation was modified and name changed a couple of times, for example some old star maps show ""Sceptrum Imperiale"", ""Stellio"" and ""Scettro"", and Johannes Hevelius's star map divides the area between the new Lacerta and as a chain end fettering Andromeda. The connection with the later constellation Frederici"
"HD 143699 HD 143699 is a single star in the southern constellation of Lupus. It is a dim star but visible to the naked eye with an apparent visual magnitude of 4.90. Based upon an annual parallax shift of , it is located around 350 light years away. It is most likely (90% chance) a member of the Upper Centaurus-Lupus subgroup of the Sco OB2 moving group. This star has a stellar classification of B5/7 III/IV, suggesting it is an evolving star that is entering the giant stage. However, according to Zorec and Royer (2012) it is only 56% of"
"to it being listed in the New General Catalogue as a possible planetary nebula. No nebulosity is visible in modern observations and the Revised New General Catalogue lists this as a ""non-existent"" object. Q Cygni Q Cygni (Q Cyg), is a star located in the constellation Cygnus. It is also known as Nova Cygni 1876, and has the designation NGC 7114, and HR 8296. Nova Cygni is located at right ascension and declination , in the northwestern portion of Cygnus along the border with Lacerta. One of the earliest novae recorded, Q Cygni was discovered by astronomer Johann Friedrich Julius"
"called the Norma Cluster, it is one of the most massive galaxy clusters known to exist, at ten times the average cluster mass. Abell 3627 is thus theorized to be the Great Attractor, a massive object that is pulling the Local Group, the Virgo Supercluster, and the Hydra-Centaurus Supercluster towards its location at 600–1000 kilometres per second. Norma (constellation) Norma is a small constellation in the Southern Celestial Hemisphere between Ara and Lupus, one of twelve drawn up in the 18th century by French astronomer Nicolas-Louis de Lacaille and one of several depicting scientific instruments. Its name is Latin for"
"system is 0.00220, implying a nearly circular orbit. The primary has a mass of , and is an F-type main-sequence star. The secondary is less massive, at . Omega Draconis Omega Draconis, Latinized from ω Draconis and also known as 28 Draconis, is a binary star in the constellation of Draco. The system is fairly close, and is located about 76 light-years (23 parsecs) away, based on its parallax. Omega Draconis is a spectroscopic binary, which means the two stellar components are too close to be resolved but periodic Doppler shifts in their spectra indicate orbital motion. In this case,"
"Hercules (constellation) Hercules is a constellation named after Hercules, the Roman mythological hero adapted from the Greek hero Heracles. Hercules was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations today. It is the fifth largest of the modern constellations. Hercules is bordered by Draco to the north; Boötes, Corona Borealis, and Serpens Caput to the east; Ophiuchus to the south; Aquila to the southwest; and Sagitta, Vulpecula, and Lyra to the west. Covering 1225.1 square degrees and 2.970% of the night sky, it ranks 5th among the"