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. The two stars take approximately 40 days to complete an orbit around their common centre of mass. Regulus A is a binary star consisting of a blue-white subgiant star of spectral type B8, which is orbited by a star of at least 0.3 solar masses, which is probably a white dwarf. Regulus D is a 12th magnitude companion at 212", but is an unrelated background object. Regulus A is the dominant star, with a binary companion 177" distant that is thought to be physically related. Regulus is a multiple star system consisting of at least four stars. Regulus is the brightest star in the constellation of Leo (right tip, below is bright Jupiter in 2004). Every 8 years, Venus near-occults the star system around that time, as on 5 September 2014. For most Earth observers, the heliacal rising (pre-sunrise appearance) of Regulus occurs in the first week of September. Regulus passes through SOHO's LASCO C3 when the sun overlaps. Thus the star can be viewed the whole night, crossing the sky, in late February. Īlthough 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 22–24, when the Sun overlaps. The International Occultation Timing Association recorded no observations at all. The center of the shadow path passed through New York and eastern Ontario, but no one is known to have seen it, due to cloud cover.
Regulus was occulted by the asteroid 163 Erigone in the early morning of March 20, 2014. Differential bending of light was measured to be consistent with general relativity. An occultation of Regulus by the asteroid 166 Rhodope was observed by 12 researchers from Portugal, Spain, Italy, and Greece on October 19, 2005. Other planets will not occult Regulus over the next few millennia because of their node positions. The next will occur on October 1, 2044, also by Venus. The last occultation of Regulus by a planet was on July 7, 1959, by Venus. As Regulus closely aligns to the mean orbits of most significant objects of the solar system and is of many times greater magnitude than its comparators, the system has advanced telescopic use (to study and identify objects which may be its orbit) such as when it is occulted by a known asteroid and in observing the shadowing formed by any intermediate solar system matter, including asteroids. Seven other stars which have a Bayer designation are less than 0.9° from the ecliptic (perfected, mean plane of earth's orbit and mean apparent path of the sun) the next brightest of which is δ (Delta) Geminorum, of magnitude +3.53. Occultations by Mercury and Venus are possible but rare, as are occultations by asteroids. Regulus is 0.465 degrees from the ecliptic, the closest of the bright stars, and is regularly occulted by the Moon.
LEOMOON PERSIAN TYPE FULL
Regulus as viewed through a 110mm refractor in full daylight. Regulus, along with five slightly dimmer stars ( Zeta Leonis, Mu Leonis, Gamma Leonis, Epsilon Leonis, and Eta Leonis) have collectively been called 'the Sickle', which is an asterism that marks the head of Leo.
HD 87884 is separated from Regulus by 176 ″ and is itself a close pair. The spectroscopic binary Regulus A consists of a blue-white main-sequence star and its companion, which has not yet been directly observed, but is probably a white dwarf.
Regulus appears singular, but is actually a quadruple star system composed of four stars that are organized into two pairs. Regulus UK: / ˈ r ɛ ɡ ˌ j u l ʊ s/ US: / ˈ r ɛ ɡ ˌ j ʊ l ʊ s ˌ/, designated α Leonis ( Latinized to Alpha Leonis, abbreviated Alpha Leo, α Leo), is the brightest object in the constellation Leo and one of the brightest stars in the night sky, lying approximately 79 light years from the Sun.
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