Regulus. Observations[edit] An occultation of Regulus by the asteroid 166 Rhodope was observed by 12 observers from Portugal, Spain, Italy, and Greece on 2005-10-19. Details are at Although best seen in the evening in northern hemisphere in late winter and spring, Regulus can be found at some time of night throughout the year except for about a month on either side of August 22, when the sun is too near.[11] Regulus passes through SOHO's LASCO C3 every August.[12] For most Earth observers, 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, most recently in 2006.
The primary of Regulus A has about 3.5 times the Sun’s mass and is a young star of only a few hundred million years. System[edit] Regulus is a multiple star system consisting of four stars. Visibility[edit] Etymology and cultural associations[edit] See also[edit] References[edit] Messier 105. History[edit] Messier 105 was discovered by Pierre Méchain on 24 March 1781, just a few days after he discovered the nearby galaxies Messier 95 and Messier 96.[3] This galaxy is one of several that were not originally included in the original Messier Catalogue compiled by Charles Messier.
Messier 105 was included in the catalog only when Helen S. Hogg found a letter by Méchain describing Messier 105 and when the object described by Méchain was identified as a galaxy previously named NGC 3379.[3] Properties[edit] Messier 105 is known to have a supermassive black hole whose mass is estimated to be between 1.4*108 and 2*108 solar masses.[4] It also contains a few young stars and stellar clusters, suggesting some elliptical galaxies still form new stars, but very slowly.[5] Galaxy group information[edit] References[edit] ^ Jump up to: a b c d e f g h i "NASA/IPAC Extragalactic Database".
External links[edit] Coordinates: 10h 47m 49.6s, +12° 34′ 54″ Messier 96. This complex galaxy is inclined by an angle of about 53° to the line of sight from the Earth, which is oriented at a position angle of 172°. It is categorized as a double-barred spiral galaxy with a small inner bulge through the core along with an outer bulge. The nucleus displays a weak level of activity of the LINER2 type. Variations in ultraviolet emission from the core suggest the presence of a supermassive black hole. Estimates for the mass of this object range from 1.5×106 to 4.8×107 times the mass of the Sun.[4] On May 9, 1998 a supernova event was observed in this galaxy.
M96 group[edit] Messier 96 with amateur telescope References[edit] ^ Jump up to: a b c d e f g "NASA/IPAC Extragalactic Database", Results for NGC 3368, retrieved 2006-10-24. External links[edit] Coordinates: 10h 46m 45.7s, +11° 49′ 12″ Messier 95. Nucleus[edit] The center of the galaxy contains a ring-shaped circumnuclear star-forming region with a diameter of approximately 2000 ly (600 pc).[3] Galaxy group information[edit] Supernova[edit] A Type II supernova, designated as SN 2012aw, was discovered in M95 on 16 March 2012.[8][9][10] Gallery[edit] This photo from Messier 95 was taken up by an amateur astronomer from Austria.In the Leo I group, Messier 95 is outshone by its brother Messier 96.Messier 95, 24 inch telescope on Mt.
References[edit] ^ Jump up to: a b c d e f g h i "NASA/IPAC Extragalactic Database". External links[edit] Coordinates: 10h 43m 57.7s, +11° 42′ 14″ Messier 66. History[edit] The colour-composite image of the Spiral galaxy M 66 (or NGC 3627) Zooming in on the Messier 66 Gravitational interaction from its past encounter with neighboring NGC 3628 has resulted in: An extremely high central mass concentration;A high molecular to atomic mass ratio;A resolved noncorotating clump of H I material apparently removed from one of the spiral arms. This third result shows up visually as an extremely prominent and unusual spiral arm and dust lane structures as originally noted in the Atlas of Peculiar Galaxies.[4] References[edit] ^ Jump up to: a b c d e f "NASA/IPAC Extragalactic Database". External links[edit] Coordinates: 11h 20m 15.0s, +12° 59′ 30″
Messier 65. Discovery[edit] M65 was discovered by Charles Messier and included in his Messier Objects list. However, William Henry Smyth accidentally attributed the discovery to Pierre Méchain in his popular 19th century astronomical work A Cycle of Celestial Objects (stating "They [M65 and M66] were pointed out by Méchain to Messier in 1780"). This error was in turn picked up by Kenneth Glyn Jones in Messier's Nebulae and Star Clusters. This has since ramified into a number of other books by a variety of authors. Star formation[edit] The galaxy is low in dust and gas, and there is little star formation in it, although there has been some relatively recently in the arms.
The Leo Triplet, with M65 at the upper right, M66 at the lower right, and NGC 3628 at the upper left. Interaction with other galaxies[edit] To the eye, M65's disk appears slightly warped, and its relatively recent burst of star formation is also suggestive of some external disturbance. References[edit] External links[edit] Coordinates: Leo_IAU. Leo. Leo (constellation) The constellation Leo as it can be seen by the naked eye (the bright object in the centre of the picture is the planet Jupiter). AlltheSky.com Leo contains many bright stars, many of which were individually identified by the ancients. There are four stars of first or second magnitude, with render this constellation especially prominent: There are several other bright double and binary stars in Leo.
Zeta Leonis, called Adhafera, is an optical triple star. The brightest and only star designated Zeta Leonis, is a white giant star of magnitude 3.65, 260 light-years from Earth. The second brightest, 39 Leonis, is widely spaced to the south and of magnitude 5.8. 35 Leonis is to the north and of magnitude 6.0.Iota Leonis is a binary star divisible in medium amateur telescopes; they are divisible in small amateur telescopes at their widest (2053-2063). Leo is also home to one bright variable star, the red giant R Leonis. Messier 66 Diagram of H.A. H.A.