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Star Hopping To M61 - Messier 61 (NGC 4303), Magnitude 9.7 A face-on spiral in the galaxy rich region of the Virgo Cluster. About 100,000 light years in diameter and lies 60 million light years away. It was discovered in 1779 by Barnabus Oriani while tracking down a comet. Charles Messier encountered it 6 days later, but mistook it for a the same comet. Two days later, Messier realized the object was not moving and added it to his cata- logue. Four supernovae have been detected in this galaxy. Star Hopping to M61 I didn’t set out to identify this galaxy inparticular, just to try and find ANY galaxy within the Virgo Cluster! To repeat and therefore confirm my sighting I jumped from Zaniah (circled) and headed straight up (two full fields of view in the 17mm Ethos, until I found an easily identifyable pattern of six stars (three that form a tight triangle). The brightest star of the group being the Double Star ‘16 Virginis’ that shines at Magnitude 4.96. A further third of a FOV jump had M61 (or something fuzzy) centred... Drawing - Takahashi TSA102s Starry Night Pro Plus 6 N (816mm Focal Length, f/8) 17mm, 100° Televue Ethos eyepiece 48x Magnification Shown below a FOV indicator William Optics EZTouch from the planetarium software - Alt/Az undriven mount White charcoal pencil on black paper. mirror reversed. Saturday 14th April, 2012 W “M61 - One of the most difficult objects I’ve tried to observe to date. VERY faint - even with averted vision. Only the drawing/star field later confirmed sighting. Faint, unresolved smudge (!) Pointer Stars with a possible vertical Brightest of this grouping is Double Star ‘16 Virginis’ that shines at Magnitude 4.96 orientation?” Star Hopping to M81/82 Extend a line from Satar Phecda M81 - Messier 81 (lower right) through Dubhe. The (NGC 3031 - Bode's Galaxy), Mag 6.9 galaxies and star Phecda are more M81 and M82 are perhaps the most famous pair or less equidistant from Dubhe. of galaxies in the sky (separated by only 150 000 light years) and both can be seen in the same low magnification field of view. Located approximately 12 million light-years away in the constellation Ursa Major they were discovered by Johann Elert Bode in 1774. Both are spiral galaxies but M81 is nearly face on, while M82 is edge on. M81 is one of the brightest galaxies in the Messier M82 - Messier 82 (NGC 3034 - Cigar Galaxy), Mag 8.4 The elongated shape of this galaxy has earned it the name Cigar Galaxy. Due to this, it is some- times classed as an irregular galaxy instead of its correct classification as a spiral galaxy. While quite faint in visible light, M82 is the brightest galaxy in the sky in the infrared region. M82 is being physically affected by its larger neighbour. Tidal forces caused by gravity have deformed this galaxy, a process that started about 100 million years ago. This interaction has caused star formation to increase tenfold compared to "normal" galaxies. Starry Night Pro Plus 6 Shown below a FOV indicator from the planetarium software - mirror reversed. “M81 /M82 Reminds me off all those observing sessions undertaken with Andy. Low power affords a classic view of both galaxies in the same field. M81 quite faint... but a definate oval patch with a prominent core, but no other detail to speak of. Drawing - Takahashi TSA102s (816mm Focal Length, f/8) M82 appearing as a slightly brighter (compared to M81) diagonal slash. 17mm, 100° Televue Ethos eyepiece Felt that one edge was brighter than the other. 48x Magnification Could not see any detail - or the prominent central rift that William Optics EZTouch Alt/Az undriven mount White charcoal pencil on black paper. I have previously observed with Andy (and which we know Saturday 14th April, 2012 responds well to our home made image intensifiers)” Drawing - Takahashi TSA102s (816mm Focal Length, f/8) 4.7mm, 110° Televue Ethos eyepiece 173.6x Magnification William Optics EZTouch Alt/Az undriven mount White charcoal pencil on black paper. Saturday 14th April, 2012 Dione Tethys Stellarium Generated to simulate Enceladus the view for the evening of 14th April Rhea “Saturn plus 4 moons - although moves too quickly at 178x mag even with 110 degree FOV! Not a particularly clear view (still quite low down in the mirk). Nice creamy white sphere with a hint of equatorial banding (possibly 2 ?) and darker - more ‘blue’ at the pole region. A and B rings separated by the Cassini division (quite clear), although more so on the left hand area as drawn here. Planet’s shadow observed both sides of the ring system ”.
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