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It exhibits an excess emission of infrared, which indicates the presence of a circumstellar disk of dust. Larry Sessions has written many favorite posts in EarthSky's Tonight area. Its estimated age is 162 million years. The galaxy was discovered by William Herschel in 1784. In science fiction, Regulus has been used for television series such as "Star Trek" and "Babylon 5." It has an apparent magnitude of 4.044 and is approximately 210 light years distant. The fainter one is Regulus B, a cool orange dwarf star with a spectral classification of K2 V. The B star has a mass that is 80% of the suns, and its half as bright. And if you have a news tip, correction or comment, let us know at: community@space.com. (In Arabic, Qalb al-Asad, anglicized to Kabelaced.) Enter your email address to follow this blog and receive notifications of new posts by email. The cloak both protected Heracles and made him appear even more fearsome. He received his 1st telescope in 1965, a 2-inch (5cm) refractor. The constellation name Leo is pronounced /lio/. It has an apparent magnitude of 1.35 and is approximately 77 light years distant. It was discovered by the German astronomer Albert Marth on April 5, 1864. The brightest star in. This group, named the M96 Group, also includes the bright galaxies Messier 105 and Messier 95, as well as a number of smaller and fainter galaxies. It has a mass of 3.8 solar masses and is an extremely fast spinner, with a rotational velocity of 347 km/s. Regulus is best seen in late winter and spring in the northern hemisphere, when it rises high above the horizon in the evening. Nevertheless, Messier 95 also makes for a spectacular image. ", is co-written with astronaut Dave Williams. The Planets 2010 - 2023 | Privacy Policy & Affiliate Disclaimer, Copyright 2023 ThePlanets.org | Sitemap, Regulus Star Image https://mirkokosmos.tumblr.com/image/114076419912, Regulus size comp https://www.daviddarling.info/images/flattened_stars.jpg, Location Of Regulus image https://starwalk.space/gallery/images/the-moon-venus-regulus-jpg/1136639. This sky map shows the location of brilliant planet Venus and the bright star Regulus in the pre-dawn sky on Oct. 3, 2012, as viewed from mid-northern latitudes. Regulus star is also known as Basiliskos, Cor Leonis (Lions Heart), Qalb al-Asad and Rex. Messier 96 is a very asymmetric galaxy; its dust and gas is unevenly spread throughout its weak spiral arms, and its core is not exactly at the galactic centre. It is approximately 135 light years distant. It was first discovered by astronomer Pierre Mchain in 1781, and added to Charles Messiers famous catalogue of astronomical objects just four days later. The Greeks associated Leo with the Nemean lion, the beast defeated by Heracles during the first of his twelve labours. The star has two known companions nearby, a set of binary stars, but observations in the past few years suggest there may be a white dwarf lurking close to Regulus as well. The companion is believed to be a white dwarf. Regulus is not a binary star for once, although there is a binary nearby, and possibly a white dwarf. Zosma, Delta Leonis, is another rapid rotator in Leo, with a projected rotational velocity of 180 km/s. [1] The Persians believed that the sky was divided into four districts with each district being guarded by one of the four Royal Stars. Leo and Regulus, picture from Nasa. The star was last occulted by Venus on July 7, 1959, and the next occultation, also by Venus, will not occur until October 1, 2044. Regulus is located 83 light years away from Earth. The BC pair lies at an angular distance of 177 arc-seconds from Regulus A, making them visible in amateur telescopes.[24]. . Regulus is easy to find and identify because it is part of a prominent asterism known as the Sickle of Leo. It is one of the zodiac constellations and one of the largest constellations in the sky. It has a visual magnitude of 3.856 and is approximately 5,000 light years distant. "Regulus Star Facts & Features About The Little King". [5] From this observation individuals began to denote them the royal stars. You can locate Regulus also known as Alpha Leonis at the base of a star pattern that appears like a backward question mark. They are located 100 astronomical units away from each other and have an orbital period of 2,000 years. The two asterisms overlap in the spring night sky. Stewart, Suzy. 35 Leonis is located 325.9 arc seconds away from Adhafera and it is only a line-of-sight companion, as it is only 100 light years distant from Earth. [32], For Earth observers, the heliacal rising (pre-sunrise appearance) of Regulus occurs late in the first week of September, or in the second week. The last occultation of Regulus by a planet was on July 7, 1959, by Venus. For other uses, see, Notable stars and star systems coplanar with the ecliptic (and sun and approximately its planets, but specifically earth), "Validation of the new Hipparcos reduction", "MSC a catalogue of physical multiple stars", "Spectroscopic Detection of the Pre-White Dwarf Companion of Regulus", "Gaia Early Data Release 3: Summary of the contents and survey properties", "Bulletin of the IAU Working Group on Star Names, No. Iota Leonis is a spectroscopic binary star with the stellar classification F3 V. It has a visual magnitude of 4.00 and is approximately 79 light years distant from the Sun. In Chinese astronomy, Regulus is part of the Xuanyuan asterism, which consists of about 17 stars, among them 10 Ursae Majoris, Alpha Lyncis, 38 Lyncis, Kappa Leonis, Alterf (Lambda Leonis), Epsilon Leonis, Rasalas (Mu Leonis), Adhafera (Zeta Leonis), Eta Leonis, Algieba (Gamma Leonis), Subra (Omicron Leonis), and Rho Leonis. Its traditional name, Algieba or Al Gieba, comes from the Arabic Al-Jabhah, which means the forehead. The star is sometimes also known by its Latin name, Juba. It was discovered by William Herschel in 1784. Its traditional name, Adhafera, comes from the Arabic al-afrah, which means the curl or the braid.. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[21] to catalog and standardize proper names for stars. It has 11 stars with known planets. Bottom line: Regulus, the brightest star in the constellation Leo the Lion, is associated with the arrival of spring, and is prominent in May skies. In Greek mythology, Leo is associated with the tale of the Nemean Lion from the myth of Heracles and his twelve labours. The location of Regulus (Alpha Leonis), image: Stellarium. Accessed on May 1, 2023. https://theplanets.org/stars/regulus-star/. 5 stars. NGC 3596 is an intermediate spiral galaxy with a visual magnitude of 12.0. He was the brother of Sirius Black, Harry's godfather, named for the brightest star in the sky. The galaxy is known to have a supermassive black hole at its centre. Messier 95 is a barred spiral galaxy in Leo. Denebola exhibits variations in luminosity of 0.025 magnitudes about ten times a day. Gliese 436 is another red dwarf located relatively close to the Sun. It has a visual magnitude of 10.6/10.9. The Sickle can be found using the bright stars of the Big Dipper, the most recognizable part of the constellation Ursa Major. The star has a relatively high projected rotational velocity, 23 km/s. The 2005 study examined the effects of the rotation for the first time using the CHARA telescope array on top of Mount Wilson in California. On March 20, 2014, the star was occulted by 163 Erigone, a relatively large asteroid first discovered in April 1876. His articles have appeared in numerous publications including Space.com, Sky & Telescope, Astronomy and Rolling Stone. It has a surface temperature of 4,885 Kelvin (8,333 F or 4,612 C), and it shines at a magnitude of 8.1. [30], Although best seen in the evening in the northern hemisphere's late winter and spring, Regulus appears at some time of night throughout the year except for about a month (depending on ability to compensate for the sun's glare, ideally done so in twilight) on either side of August 2224, when the Sun is too close. Space is part of Future US Inc, an international media group and leading digital publisher. They are dimmer main sequence stars with an apparent magnitude of 8.14 and 13.5. In the northern hemisphere, Leo is easily seen in the . The stars traditional name, Alterf, comes from the Arabic a-arf, which means the view (of the lion).. The second brightest star is Denebola, an A-type main-sequence star-forming the tail of the lion. Filter by rating. Before it became a white dwarf, the companion is believed to have transferred a lot of its mass onto the other star through gravitational interaction, speeding up the primary components rotation rate to what it is now. [16] The companion pair has an orbital period of about 600 years[5] with a separation of 2.5" in 1942.[16]. The system lies approximately 79 light years from the Sun. Regulus is the bright star that makes the point of the question mark. The star belongs to the IC 2391 supercluster, a stellar association whose member stars share a common motion through space, but are not gravitationally bound. Regulus, Denebola, the Leo Triplet and the Leo I Group, image: Wikisky. It was discovered by Pierre Mchain on March 20, 1781 and then included in Messiers catalogue a few days later. They were regarded as the guardians of the sky during the time of the Persian Empire (550 BC330 BC) in the area of modern-day Iran. Find movie showtimes and movie theaters near 85340 or Litchfield Park, AZ. The star Spica - aka Alpha Virginis - is the brightest star in the constellation Virgo the Maiden. 1415 E University Dr, Suite A105 Tempe, Arizona 85281 Details Maps. 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. 1 star. More than 80% of them are Population II stars, more than a billion years old. Some Peruvians also knew these stars as the Mountain Lion, whereas in China it was sometimes seen as a horse, and at other times as part of a dragon. [citation needed] In Chinese it is known as , the Fourteenth Star of Xuanyuan, the Yellow Emperor. Retrieved from https://theplanets.org/stars/regulus-star/. The best time of the year to observe the stars and deep sky objects of Leo is during the month of April, when the constellation is high above the horizon in the evening. I am the child of earth and starry heaven. Petelia Tablet, We are all in the gutter, but some of us are looking at the stars. Oscar Wilde. Because Regulus can stray within the ecliptic, or the path upon which the sun and planets travel, it is very occasionally eclipsed by one of the planets or an asteroid. Regulus, designated as Alpha Leonis, is the brightest star in Leo, and the 21 st brightest star in the night sky, having an apparent magnitude of 1.40. Regulus A has an average temperature of around 12.460 Kelvin. The Persians knew the star as Miyan, the Centre and as Venant, the guardian of the north. Denebola has 75% more mass than the Sun, 173% of the solar radius, and is 12 times more luminous. Astronomers have concluded that these stars are zooming around a supermassive black hole with an estimated mass of 200 million Suns! Other planets will not occult Regulus over the next few millennia because of their node positions. Her latest book, "Why Am I Taller? Elizabeth is also a post-secondary instructor in communications and science since 2015. Due to the stars oblate shape, its poles are closer to the centre of mass and have a higher effective temperature and therefore brightness, while the equatorial region is cooler and less bright. The 2018 Gaia data release 2 revealed it to be a background object, not physically related to the Regulus system. Rho Leonis is a runaway star and has a peculiar velocity of 30 km/s at the minimum relative to the nearby stars. The Babylonians also recorded details of Regulus, the bright star within Leo, as The Great Lion constellation. Leo Triplet, image: Wikimedia Commons/Marekmazuch (CC BY-SA 4.0). The Planets. [citation needed] and are the brightest stars in their constellations and among the 25brightest stars in the night sky. Regulus B, meanwhile, has its own companion: Regulus C. At magnitude 13.5, its only visible with powerful telescopes. Our Sun in comparison has an average temperature of 5.778 Kelvin. NGC 2903 is a barred spiral galaxy. Elizabeth Howell (she/her), Ph.D., is a staff writer in the spaceflight channel since 2022 covering diversity, education and gaming as well. [27] The next will occur on October 1, 2044, also by Venus. The Persians knew the constellation as Shir or Ser, Babylonians called it UR.GU.LA (the great lion), Syrians knew it as Aryo, and the Turks as Artan. Search reviews. Variations in the spin of the star mean there is probably a white dwarf, or dead star, lurking in the vicinity of Regulus, the astronomers argued in 2008. Messier 66 is an intermediate spiral galaxy in Leo. Its arms are also asymmetrical, thought to have been influenced by the gravitational pull of other galaxies within the same group as Messier 96. Regulus, also known as Alpha Leonis, is the brightest star in the constellation Leo and the 21st brightest star in the night sky. It has a visual magnitude of 4.1 and is about 133 light years distant from Earth. It has an apparent magnitude of 1.35 and is not actually a single star, but a multiple star system. Except that he did throw his lot in with Voldemort, which doesn't strike us as particularly clever. Lyra is a Latin name that in English means "The Lyra". CW Leonis is a carbon star embedded in a thick envelope of dust. Astronomers had a detailed look at Regulus' motion in a study published in 2005, showing that the star would only need to rotate about 10 percent faster to tear itself to pieces. Situated 1/3 degree north of Regulus is the galaxy Leo 1 you can see it as a faint patch of light in the photo below. R Leonis has a radius 320-350 times solar. Eta Leonis is white supergiant belonging to the spectral class A0 Ib. In Arabic, it is . By the time of the Persian Empire (550 BC330 BC), 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 in Aquarius). The light of the star took 9.34 billion years to reach Earth. Together, the pair have a right ascension of 10h 08m 12.8/14s and a declination of +11 59 48. 1", "Occultations of bright stars by planets between 0 and 4000", "The 2001 US Naval Observatory Double Star CD-ROM. NGC 3628, image: Pablo Carlos Budassi (CC BY-SA 4.0). Fixed star Regulus, Alpha Leonis, is a 1.4 magnitude blue-white star in Leo Constellation. In some years, the moon occults (passes in front of) this star as seen from Earth. The next brightest star to the ecliptic is Wasat, Delta Geminorum, with a visual magnitude of 3.53. The planet Venus passes the star around this time every eight years. Wolf 359 is classified as a flare star, one that can undergo dramatic increases in luminosity for several minutes as a result of magnetic activity on its surface. The star is suspected to be a part of a binary system. The star has an optical companion, 35 Leonis, which has an apparent magnitude of 5.90. It is spinning extremely rapidly, with a rotation period of only 15.9 hours, which causes it to have a highly oblate shape. For example, in mid-July 2023, both Venus and Mars will visit Regulus in the evening sky. 5 star rating. Regulus is the only 1st magnitude star to sit almost squarely on the ecliptic, which marks the path of the sun, moon and planets across our sky. The stars traditional name, Zosma, comes from ancient Greek and means the girdle. Zosma is located on the lions hip. Together with the bright Spica in Virgo and Arcturus in Botes, Regulus forms the Spring Triangle, another prominent asterism appearing in the evening sky from March to May. It has an apparent magnitude of 3.511 and is approximately 2,000 light years distant from Earth. The stars Greek name, Basiliscos, had the same meaning. [4] The sun was then surrounded by four bright stars at the beginning of every season. This means that it completes a rotation every 15.9 hours and, as a result, its shape has been distorted into an oblate spheroid, with the equatorial diameter 32 percent larger than the polar diameter. Regulus A is the dominant star, with a binary companion 177" distant that is thought to be physically related. Earendel is almost twice as distant, lying 28 billion light-years away. It was the Polish astronomer and mathematician Nicolaus Copernicus who translated these names into Latin as Regulus. As an 8th magnitude star, Regulus B can be seen with binoculars. Draco) or exist in the real world (e.g. As Regulus closely aligns to the mean orbits of large bodies of the solar system and involves more light reaching the Earth than such other stars, the system has advanced telescopic use (to study and identify objects occulting and casting their shadow on a telescope, including known or unknown asteroids of the solar system such as Trojans, being in line by definition with their associated planetary plane). This article is about the star. Save. It is the object within the Regulus system that can be seen with the naked eye. Messier 96 is another intermediate spiral galaxy in Leo constellation. The name Denebola comes from the Arabic anab al-asad, which means the lions tail.. By early June, itll be high in the southwest an hour after sunset. An occultation of Regulus by the asteroid 166 Rhodope was filmed in Italy on October 19, 2005. Kappa Leonis is a binary star with an apparent magnitude of 4.46, approximately 210 light years distant from the solar system. Regulus is not a binary star for once, although there is a binary nearby, and possibly a white dwarf. It looks like a single point of light, but is really four stars. The name Regulus was officially approved by the International Astronomical Unions (IAU) Working Group on Star Names (WGSN) on June 30, 2016. This refers to the star that stands in the breast of the Lion: the King. Inferno Escape Room. The brightest star in Leo is Regulus, Alpha Leonis, with an apparent magnitude of 1.35. [16] This results in so-called gravity darkening: the photosphere at Regulus' poles is considerably hotter, and five times brighter per unit surface area, than its equatorial region. There are no recently available measurements. It is the 22nd brightest star, although the 21st, Alpha Centauri, is not much brighter than it is. Leo is the 12th largest constellation in size, occupying an area of 947 square degrees. These stars were considered to be the guardians of the sky in ancient Persia, around the year 3000 BCE. The International Occultation Timing Association recorded no observations at all. The galaxy is notable for having a long tidal tail spanning about 300,000 light years, and a broad, obscuring dust band along the outer edge of its spiral arms. It is located in the second quadrant of the northern hemisphere (NQ2) and can be seen at latitudes between +90 and -65. Because Regulus was the most influential of the royal stars, events that took place while Regulus was in dominance were amplified and grave, foreshadowing destruction, depending on what planet or planets might be in conjunction with the star. The central region of M95 has a ring-shaped starburst region around the core with a diameter spanning about 2,000 light years. This is because the star is so distorted that it lessens gravity's strength, which then turns down the temperature at the equator, the researchers said. Both Eratosthenes and Hyginus wrote that the lion was placed among the constellations because it was the king of beasts. There is a great deal of mythology associated with Leo, perhaps the most common tale being that Leo was the Nemean Lion of the Hercules story. The Chinese knew Regulus as the Fourteenth Star of Xuanyuan, the Yellow Emperor (). So bright planets sometimes pass near Regulus. Consequently, its apparent magnitude varies too, ranging from 1.19 to 10.96. Along with Regulus in Leo, Alpha Virginis is believed to be one of the bright stars that made it possible for Hipparchus (160 - 120 BC) to discover the precession of the equinoxes, after comparing his data to that of the Alexandrian Timochares, who had observed Spica and Regulus around 300 BC. A Type Ia supernova, SN 1998bu, was discovered in M96 in May 1998. The distances between B and C ranged from 4.0 to 2.5 arc seconds between 1867 and 1943. The stars Altair and Achernar are also fast spinners with flattened, oblate shapes. Icarus was discovered in 2018 by a team of astronomers who were studying the multiply lensed supernova SN Refsdal with the Hubble Space Telescope. The star has two known companions nearby,. [4], The constellations of the royal stars were said to be fixed because their positions were close to the four fixed points of the sun's path. The galaxy Messier 95 stands boldly face-on, offering an ideal view of its spiral structure. His small book on world star lore, Constellations, was published by Running Press. The gaseous envelope, rich in carbon, is some 69,000 years old and the star is losing an enormous amount of mass each year. Regulus appears below the Lions head and shoulders and marks its heart. Regulus B is a K2V star and the companion is believed to be a red dwarf of the spectral type M4V. When it is at its brightest, it can be seen without binoculars, and when it is on the dimmest end of the spectrum, one needs at least a 7 cm telescope to see the star. Something went wrong while submitting the form. The components in the system are too close together to be able to resolve through a telescope. Leo constellation map by IAU and Sky&Telescope magazine. The Sickle looks like a backward question mark and consists of the stars that outline the mane of the celestial Lion. Zosma is a white main sequence star of the spectral type A4 V, approximately 58.4 light years from Earth. This occurs in spates every 9.3 years, due to lunar precession. The companion is believed to be a white dwarf. Source. Heracles is represented by the larger constellation Hercules. The entire constellation is visible from locations north of the latitude 65 S. The 10 brightest stars in Leo are Regulus (Alpha Leo, mag. Another bright star, Denebola (Beta Leonis) marks the tip of the lions tail. The celestial Lion is one of the 48 Greek constellations, first catalogued by the Greek astronomer Ptolemy of Alexandria in his Almagest in the 2nd century CE. It has a visual magnitude of 2.56. In fact, this image from Hubble frames a perfect spiral specimen: the stunning NGC 2903. Similar to the way the Big Dipper can serve as a pointer to Polaris, two stars on the left-hand side of the Dipper's bowl can serve as pointers to Regulus in the opposite direction of the sky. Regulus A is itself a spectroscopic binary; the secondary star has not yet been directly observed as it is much fainter than the primary. "A companion may be a low mass white dwarf or main sequence star," a preprint version of the research paper read. Regulus B is slightly hotter. It is classified as a Cepheid variable, changing by an amplitude of 0.3 magnitude every few days.

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