It can be seen in the night sky throughout the year except for a month on either side of August 22, when the Sun comes too close to the star. [18] 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. The equatorial diameter of Regulus is 32 percent larger than its polar diameter. His 2nd comet took an additional 1742 hours. 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. Language links are at the top of the page across from the title. Most of the stars in the galaxy are old. Regulus is 150 times brighter than the Sun, and its energy output is 350 times that of the latter. It appears as a backward question mark in the night sky. The galaxy can be found below the bright star Theta Leonis. The International Occultation Timing Association recorded no observations at all. Charles Messier discovered it in 1780. In Greek mythology, Leo is associated with the tale of the Nemean Lion from the myth of Heracles and his twelve labours. Regulus has a mass 3.8 times that of the Sun and a radius 4.35 times solar. It is approximately 135 light years distant. These include the Messier 96 Group (the Leo I Group) with member galaxies Messier 95, Messier 96, and Messier 105, and the Messier 66 Group (the Leo Triplet), which consists of the galaxies Messier 65, Messier 66, and NGC 3628. 2.98), Chertan (Theta Leo, mag. The brighter giant is 180 times more luminous than the Sun and has an apparent magnitude of 2.28. CW Leonis is a carbon star embedded in a thick envelope of dust. You can locate Regulus also known as Alpha Leonis at the base of a star pattern that appears like a backward question mark. The Gamma Leonis system has a combined apparent magnitude of 1.98 and is approximately 130 light years distant from the Sun. Your email address will only be used for EarthSky content. NGC 3593 is a spiral galaxy in Leo. [2] The stars were believed to hold both good and evil power and the Persians looked upon them for guidance in scientific calculations of the sky, such as the calendar and lunar/solar cycles, and for predictions. 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. Language links are at the top of the page across from the title. Icarus is a blue supergiant of the spectral type B, located approximately 14.4 billion light-years from Earth. Among the odd effects on the star: Regulus is much hotter at its poles (27,212 F, or 15,100 C) than its equator (18,032 F or 10,000 C). Located in the southern hemisphere, Centaurus is named for the half man half horse creatures of Greek mythology. The galaxys disk appears slightly warped, which, along with some recent starburst activity, suggests that the galaxy is interacting with another object. It emits only about 0.1% of the Suns energy, has 8% of the Suns mass, and only 16% the solar radius. The name Regulus is a diminutive form of "rex", which is Latin for "king". The two stars take approximately 40 days to complete an orbit around their common centre of mass. His articles have appeared in numerous publications including Space.com, Sky & Telescope, Astronomy and Rolling Stone. NGC 3384 belongs to the M96 Group (Leo I Group) of galaxies. 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. As a result, the star is emitting polarized light. The stars traditional name, Alterf, comes from the Arabic a-arf, which means the view (of the lion).. Regulus, Alpha Leonis, is the brightest star in Leo and the 22nd brightest star in the sky. 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). Reblogged this on Die Goldene Landschaft. They have a combined apparent magnitude of 3.53. If you've already donated, we apologize for the popup and greatly appreciate your support. The star has two known companions nearby,. Regulus D is a 12th magnitude companion at 212",[33] but is an unrelated background object. The stars Altair and Achernar are also fast spinners with flattened, oblate shapes. Search reviews. Now let's take a look at some of the best things to do in Litchfield Park, Arizona. The galaxy has a visual magnitude of 8.9 and is about 36 million light years distant. So bright planets sometimes pass near Regulus. Its brightness is 288 times that of the Sun. Regulus is fairly easy to find in the sky as it is part of the Sickle of Leo, a prominent asterism in the constellation Leo, and marks the lower end of the Sickles handle. 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. History and mythology of Aldebaran. A and BC share a common proper motion and are thought to orbit each other[5] taking several million years. With just 1/3 the mass of the sun, Regulus C is a red dwarf star with a spectral classification of M4V. Regulus B and C are gravitationally bound to each other, and together theyre called Regulus BC. He received his 1st telescope in 1965, a 2-inch (5cm) refractor. 3.9). In fact, this image from Hubble frames a perfect spiral specimen: the stunning NGC 2903. And Regulus is not the only star with a fast spin. [23], The Regulus system as a whole is the twenty-first brightest star in the night sky with an apparent magnitude of +1.35. Every month or so one of the constellations in the belt hides directly behind the Sun opposite to Earth. Astrophotographer John Chumack sent in a photo of Mars (red), Regulus (blue star) and the waning crescent moon in a triangle over his backyard observatory in Dayton, OH. 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. While watching the sky, the dominant star would appear in its season, each having a time of the year when most noticeable. The components in the system are too close together to be able to resolve through a telescope. NGC 3842 is an elliptical galaxy, notable for having one of the largest black holes known. Fierce lion-headed deities, like Sekhmet whose breath formed the desert, and Tefnut who fled to the desert of Nubia in her rage, and the war-god Maahes, were associated both with scorching heat and protection of the pharaoh. [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. Its estimated age is less than 400 million years. The existence of a white dwarf companion would mean that the system is at least 1 billion years old, just to account for the formation of the white dwarf. Join our Space Forums to keep talking space on the latest missions, night sky and more! The galaxy lies in the vicinity of the bright star Delta Leonis (Zosma). Regulus A is only a few million years old. Regulus first received its name from the 16th-century astronomer Nicolaus Copernicus, the encyclopedia added, "marking the fact that it had been regarded as one of the leading stars in the sky for some 2,000 years.". [18], The primary of Regulus A has about 3.8 times the Sun's mass. 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. Like Regulus and Denebola, Zosma has an equatorial bulge and an oblate shape. Regulus A has a right ascension of 10h 08m 22.311s and a declination of +11 58 01.95. And now, in May, this blue-white star is brilliant in the eastern evening sky as soon as the sun goes down. Christians in the Middle Ages sometimes referred to it as one of Daniels lions. The star was listed as one of four "royal stars," first under the name Venant and then Miyan ("the center", according to the Encyclopedia of Astronomy and Astrophysics.). Regulus B, meanwhile, has its own companion: Regulus C. At magnitude 13.5, its only visible with powerful telescopes. It's the brightest star in the constellation and among the brightest in Earth's night sky. 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. Nevertheless, Messier 95 also makes for a spectacular image. It can show you might rank high in urban affairs, land management, etc. The royal stars are mentioned in the Bundahishn, a collection of Zoroastrian cosmogony and cosmology. Albert George Wilson found it on photographic plates taken as part of the National Geographic Society-Palomar Observatory Sky Survey in 1950. NGC 3593, image: NASA/ESA The Hubble Legacy Archive (HLA): Space Telescope Science Institute (STScI), the Space Telescope European Coordinating Facility (ST-ECF), and the Canadian Astronomy Data Centre (CADC) zoranknez (Aladin software). Kappa Leonis is a binary star with an apparent magnitude of 4.46, approximately 210 light years distant from the solar system. In contrast, our sun spins on its axis about once every 27 days. . Great. Elizabeth's reporting includes multiple exclusives with the White House and Office of the Vice-President of the United States, an exclusive conversation with aspiring space tourist (and NSYNC bassist) Lance Bass, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, working inside a spacesuit, and participating in a simulated Mars mission. Alpha Leonis is the closest bright star to the ecliptic. 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. It formally applies only to the component Alpha Leonis A, but is informally used for the whole system. Regulus D is a 12th magnitude star located at a separation of 212 arcseconds. M66 is approximately 95,000 light years across and notable for its dust lanes and bright star clusters. 166 Rhodope, an asteroid about 54.6 km in size, occulted the star on October 19, 2005. Differential bending of light was measured to be consistent with general relativity. I. The star is also known by its Latin name Cor Leonis and the Arabic Qalb al-Asad (Kalb al Asad, Kabeleced). 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 text dealt with astrology and the supposed effect of events in the sky on humanity. Regulus' location is: One of the earliest references to Regulus was in ancient Persia, around 3000 B.C. The galaxy is classified as a double-barred spiral with a small inner bulge through the centre along with an outer bulge. Indeed, the lowest mass white dwarfs are usually found in binary systems where they lost a significant fraction of their mass.". Regulus A was long thought to be fairly young, only 50 100 million years old, calculated by comparing its temperature, luminosity, and mass. Regulus appears at the base of the Sickle and marks the Lions heart. Another mystery is the source of its extremely rapid spin and strange motion. Regulus appears below the Lions head and shoulders and marks its heart. Regulus is a bright star seen in the constellation Leo. Along with Messier 65 and Messier 66, NGC 3628 forms the Leo Triplet galaxy group. Its traditional name, Adhafera, comes from the Arabic al-afrah, which means the curl or the braid.. The light of the star took 9.34 billion years to reach Earth. It is a double star divisible in binoculars, with a secondary of magnitude 7.7. The constellation name Leo is pronounced /lio/. While Regulus, like the sun, fuses hydrogen to helium in its center, it is more massive than the sun and therefore hotter and brighter. It is a bluish star, and it can be seen all around the globe. It has a nominal luminosity of 11,300 times that of the Sun, but this varies over the course of the pulsation cycle, from 6,250 to 15,800 times the Suns luminosity. 12/13/2022. It is located at 79 light-years from us. Regulus B and Regulus C share a common proper motion. The Persians might have thought otherwise if they knew what astronomers know now: it rotates extremely fast, and doesnt need to go a whole lot faster to tear itself to pieces, and like Uranus its axis is tilted, so that the poles are roughly where the equator should be. The last occultation of Regulus by a planet was on July 7, 1959, by Venus. Regulus, the brightest star in the constellation Leo, the lion, is a harbinger of spring in the Northern Hemisphere. Regulus is the brightest object in the constellation Leo and one of the brightest stars in the night sky. Leo constellation is home to the bright stars Regulus and Denebola, the nearby star Wolf 359, and to a number of famous deep sky objects, among them galaxies Messier 65, Messier 66, Messier 95, Messier 96, Messier 105, and NGC 3628. The two asterisms overlap in the spring night sky. You might have heard of a star called Regulus D. This does not refer to the spectroscopic companion of Regulus A, but to a 12th-magnitude star that sits 212 arcseconds from Regulus. [4] When the stars were aligned accordingly, favourable conditions followed, and when they were negatively aligned, disaster was predicted. The 2018 Gaia data release 2 revealed it to be a background object, not physically related to the Regulus system. Leo's brightest star, Regulus, was often called the "Red Flame" and was thought to contribute to the heat of summer. Also, with a rotation period of 15.9 hours, Regulus is a lot faster than the Sun. The last spate was around 2017, with occultations every month from December 2016 till July 2017, each one limited to certain areas on Earth. The flares from the star emit strong bursts of gamma rays and X-ray radiation. The neighboring constellations are Cancer, Coma Berenices, Crater, Hydra, Leo Minor, Lynx, Sextans, Ursa Major and Virgo. The representation may be mythical (e.g. Regulus B and C are the other pair of stars in the system. Archaeological evidence suggests that Mesopotamians had a constellation similar to Leo as early as 4000 BC. The primary component, formally known as Regulus, has been given the stellar classification B8 IVn, with the luminosity class of a subgiant star. NGC 3357 is an elliptical galaxy in Leo. Regulus is the dot of the question mark. The stars traditional names, Rasalas (or Ras Elad Borealis) and Alshemali are abbreviated from the Arabic phrase ras al-asad a-aml, which means the northern (star) of the lions head.. The star is also one of the vertices of the Spring Triangle, a conspicuous asterism visible in the evening sky during the northern hemisphere spring. It has 3 championship courses, of which 2 were designed by the famous architect . The galaxy resembles a giant maelstrom of glowing gas, rippled with dark dust that swirls inwards towards the nucleus. Leo 1 is difficult to see due to its proximity to Regulus. Denebola exhibits variations in luminosity of 0.025 magnitudes about ten times a day.
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