I looked at all sorts , wasn't in the mood to take several hours of exposures of just one object, it nver seems to pay off in terms of quality with my aging DSLR. This is soon to be replaced with a CMOS camera, monochrome, that can be used with luminance, red, green and blue filters to get coloured images. Will be a steep learning curve since its a very different device to a DSLR.
Anyway, all the exposures add up to no more than an hour for any one object, at ISO's of either 1600 or 3200 , hence the noise in some).
M3 Globular Cluster in Canes Venatici
Wikipedia: Messier 3 (M3 or NGC 5272) is a globular cluster of stars in the northern constellation of Canes Venatici. It was discovered on May 3, 1764 and was the first Messier object to be discovered by Charles Messier himself.
Anyway, all the exposures add up to no more than an hour for any one object, at ISO's of either 1600 or 3200 , hence the noise in some).
M3 Globular Cluster in Canes Venatici
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| M3 Globular Cluster in Canes Venatici |
M3 has an apparent magnitude of 6.2, making it a difficult naked eye target even with dark conditions. With a moderate-sized telescope, the cluster is fully defined.
This cluster is one of the largest and brightest, and is made up of around 500,000 stars.It is estimated to be 11.4 billion years old . It is located at a distance of about 33,900 light-years away from Earth.
NGC in Serpens Caput, showing two quasars....just..honest!
Messier 101 in Ursa Major, the Pinwheel Galaxy
Wikipedia: M101 is a large galaxy, with a diameter of 170,000 light-years. By comparison, the Milky Way has a diameter of 258,000 light years. It has around a trillion stars, twice the number in the Milky Way. It has a disk mass on the order of 100 billion solar masses, along with a small central bulge of about 3 billion solar masses.
Messier 51 in Canes Venatici - The Whirlpool Galaxy
Wikipedia: The Whirlpool Galaxy, also known as Messier 51a, M51a, and NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus.
It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy. Its distance is estimated to be 23 million light-years away from Earth.
Whirlpool Galaxy lies 23 million light years from Earth and has an estimated diameter of 76,000 light years. Overall the galaxy is about 76% the size of the Milky Way. Its mass is estimated to be 160 billion solar masses.
A black hole, once thought to be surrounded by a ring of dust, but now believed to be partially occluded by dust instead, exists at the heart of the spiral. A pair of ionization cones extend from the active galactic nucleus.
Spiral structure
The pronounced spiral structure of the Whirlpool Galaxy is believed to be the result of the close interaction between it and its companion galaxy NGC 5195, which may have passed through the main disk of M51 about 500 to 600 million years ago.
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| NGC 3044 with two quasars (arrowed) |
Messier 101 in Ursa Major, the Pinwheel Galaxy
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| M101 in Ursa Major |
Messier 51 in Canes Venatici - The Whirlpool Galaxy
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| The Whirlpool Galaxy and friend NGC 5195 |
It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy. Its distance is estimated to be 23 million light-years away from Earth.
Whirlpool Galaxy lies 23 million light years from Earth and has an estimated diameter of 76,000 light years. Overall the galaxy is about 76% the size of the Milky Way. Its mass is estimated to be 160 billion solar masses.
A black hole, once thought to be surrounded by a ring of dust, but now believed to be partially occluded by dust instead, exists at the heart of the spiral. A pair of ionization cones extend from the active galactic nucleus.
Spiral structure
The pronounced spiral structure of the Whirlpool Galaxy is believed to be the result of the close interaction between it and its companion galaxy NGC 5195, which may have passed through the main disk of M51 about 500 to 600 million years ago.
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