Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. They share a common proper motion and are thought to orbit each other. For Regulus C, the location is 10 h 08m 12.8 and +11 ° 59` 48 . Copyright © 2020 Multiply Media, LLC. , Regulus A is a binary star consisting of a blue-white main sequence star of spectral type B7V, which is orbited by a star of at least 0.3 solar masses, which is probably a white dwarf. Another problem generated by its fast spin rate is the fact that it is producing what is called a gravity darkening. Ano ang Imahinasyong guhit na naghahati sa daigdig sa magkaibang araw? In Persian astronomy, the sky was divided into four districts and each district was guarded by one of the four bright stars. Based on the star's spectral type of M4V , Regulus C's colour and type is red main sequence star. This belief was shattered though when astronomers discovered one of Regulus’s companions which appeared to be a white dwarf star. Most of them operate in the range of 0-120°C, except for the only one 0-500°C stem thermometer that is supplied without a sheath. 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.  For most Earth observers, the heliacal rising (pre-sunrise appearance) of Regulus occurs in the first week of September. The first is a K2V star, while the second is about M4V. As a result, the star is emitting polarized light. The companion is believed to be a white dwarf. With a combined apparent magnitude of 1.36, it is the brightest star in Leo and the 21st brightest star in the sky. Regulus B is visible in binoculars, while Regulus C can only be resolved in a larger telescope. This phenomenon actually means that Regulus is a lot hotter at its polar regions than elsewhere. Alpha Leo may dominate this star system, but it is not alone. s r.o. The name Regulus means “little king” or “prince” in Latin. Due to the star’s oblate shape, its poles are closer to the centre of mass and have a higher temperature and brightness, while the equatorial region is cooler and less bright. 2.56), Epsilon Leonis (mag. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. These regions are also in response, almost five times brighter as the stars equatorial regions. Differential bending of light was measured to be consistent with general relativity. Leo is also home to the red dwarf Wolf 359, one of the nearest stars to the Sun at a distance of 7.86 light years, the bright variable red giant star R Leonis, and the carbon star CW Leonis, the brightest star in the infrared N-band (10 μm). Acamar Achernar Acrux Adhara Albireo Alcor Alcyone Aldebaran Alderamin Algenib Algol Alhena Alioth Alkaid Almach Alnair Alnilam Alnitak Alpha Centauri Alphard Alphecca Alpheratz Altair Aludra Ankaa Anser Antares Arcturus Ascella Asterope Atlas Atria Avior Baten Kaitos Bellatrix Betelgeuse Bharani Canopus Capella Caph Castor Celaeno Deneb Denebola Diphda Dubhe Electra Elnath Eltanin Enif Fomalhaut Gacrux Gamma Cassiopeiae Ginan Hadar Hamal Imai Izar Kaus Australis Kaus Borealis Kaus Media Maia Marfik Markab Megrez Meissa Menkalinan Menkar Menkent Merak Merope Mesarthim Miaplacidus Mimosa Mintaka Mira Mirach Mirfak Mirzam Mizar Mu Cephei Naos Nunki Peacock Phecda Pleione Polaris Pollux Procyon Proxima Centauri Rasalhague Regulus Rho Ophiuchi Rigel Rigil Kentaurus Ruchbah Sabik Sadr Saiph Sargas Scheat Schedar Segin Seginus Shaula Sheratan Sirius Spica Stephenson 2-18 Suhail Taygeta Thuban Toliman Unukalhai UY Scuti Vega VV Cephei VX Sagittarii Wezen WOH G64 Zeta Reticuli Zubenelgenubi Zubeneschamali, 79.3 ± 0.7 light years (24.3 ± 0.2 parsecs). They share a common proper motion and are about 100 AU away from one another. The BC pair lies at an angular distance of 177 arc-seconds from Regulus A, making them visible in amateur telescopes.. The last occultation of Regulus by a planet was on July 7, 1959, by Venus. Each of the 15 stars was associated with a planet, a plant and a gemstone and the latter two were used in rituals to bring out the star’s influence. , Regulus BC is 5,000 AU from Regulus A. The other components are also still on the main sequence, but considerably fainter than Regulus A, with apparent magnitudes of 8.1 (Regulus B) and 13.5 (Regulus C). They have an orbital period around a common barycenter, which is completed once every 40 days. Our Sun in comparison has an average temperature of 5.778 Kelvin. Regulus appears as a single star to the naked eye, but it is in fact a multiple star system consisting of two pairs of stars and possibly more components. Regulus was also known by the Arabic name Qalb al-Asad, the Greek name Kardia Leontos and Latin Cor Leonis, all meaning “the heart of the Lion.” In Europe, the star was known as Rex and Basiliscus. In Chinese astronomy, Regulus is part of the Xuanyuan asterism, which consisting 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), Algieba (Gamma Leonis), Subra (Omicron Leonis), and Rho Leonis. Regulus is the faintest of the 22 first magnitude stars. Sirius A is estimated to have surface temperatures of around 10,000C (18,000F), almost twice as hot as the sun, Sirius B has surface temperatures of around 25,000C (45,000F), which is almost five times as hot as the sun. It is believed that Regulus A was much smaller in the beginning but accumulated mass as Regulus B became a white dwarf. Regulus is best seen in late winter and spring in the northern hemisphere, when it rises high above the horizon in the evening. 2.08), Denebola (Beta Leo, mag. Pressure gauge, 2.5 bar, d=63mm, G 1/4", bottom conn. Pressure gauge, 4 bar, d=63mm, G 1/4", bottom conn. Pressure gauge, 6 bar, d=63mm, G 1/4", bottom conn. Together with the stars Spica and Arcturus, Regulus forms another prominent asterism known as the Spring Triangle. It was the Polish astronomer and mathematician Nicolaus Copernicus who translated these names into Latin as Regulus. The primary star, Regulus A, has a very fast rotational velocity of 347 kilometers / 215 miles per second. Since Regulu is sufficiently bright enough, many civilizations had the change to witness it with the naked eye and record it. , Coordinates: 10h 08m 22.3s, +11° 58′ 02″, This article is about the star. The star can not be seen by the naked eye, you need a telescope to see it. The best time of year to observe the stars and deep sky objects of Leo is during the month of April. Regulus A has an average temperature of around 12.460 Kelvin. Pressure gauges are available in 0-10 bar pressure range, as capillary versions or designed for direct mount with bottom or rear connection. 3.52), and Rho Leonis (mag. This asterism appears in the evening sky from March to May. They are the only navigational stars in Leo. These are the same stars that are used to find Polaris, the North Star. Monocular vs. Binoculars- Which One is Best for Stargazing.