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| 133 files in 12 albums and 1 categories with 0 comments viewed 59,966 times |
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jewelbox.jpgJewelbox.409 viewsThe Jewel Box (also known as NGC 4755, the Kappa Crucis Cluster and Caldwell 94) is an open cluster in the constellation of Crux. As Kappa Crucis, it has a Bayer designation despite the fact that it is a cluster rather than an individual star.
It is one of the finest open clusters discovered by Nicolas Louis de Lacaille when he was in South Africa during 1751–1752. This cluster is one of the youngest known, with an estimated age of only 7.1 million years. It has an apparent magnitude of 4.2, and is located 6,440 light years from Earth and contains around 100 stars.
This famous group of young bright stars was named the Jewel Box from its description by Sir John Herschel as "a casket of variously coloured precious stones," which refers to its appearance in the telescope. The bright orange star Kappa Crucis contrasts strongly against its predominantly blue, hot companions. Kappa Crucis is a very large (hence very luminous) young star in its red supergiant stage, which paradoxically indicates that its life is drawing to a close. The cluster looks like a star to the unaided eye and appears close to the easternmost star of the Southern Cross, (Beta Crucis), so is only visible from southern latitudes.Martin
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NGC253done2Meg.jpgNGC253405 viewsG11 guiding test on 24-08-2011 with latest August firmware.
10x200Sec RGB and 25x300Sec L on a ED80 and QHY9.
Uncropped.Martin
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Lagoon.jpgLagoon nebula.620 viewsThe Lagoon Nebula is estimated to be between 4,000-6,000 light-years from the Earth. In the sky of Earth, it spans 90' by 40', translates to an actual dimension of 110 by 50 light years. Like many nebulas, it appears pink in time-exposure color photos but is gray to the eye peering through binoculars or a telescope, human vision having poor color sensitivity at low light levels. The nebula contains a number of Bok globules - dark, collapsing clouds of protostellar material - the most prominent of which have been catalogued by E. E. Barnard as B88, B89 and B296. It also includes a funnel-like or tornado-like structure caused by a hot O-type star that pours out ultraviolet light, heating and ionizing gases on the surface of the nebula. The Lagoon Nebula also contains at its centre a structure known as the "Hourglass Nebula" (so named by John Herschel), which should not be confused with the better known Hourglass Nebula in the constellation of Musca. In 2006 the first four Herbig-Haro objects were detected within the Hourglass, also including HH 870. This provides the first direct evidence of active star formation by accretion within it.Martin
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Eagle_done-1.jpgEagle nebula.421 viewsThe Eagle Nebula is part of a diffuse emission nebula, or H II region, which is catalogued as IC 4703. This region of active current star formation is about 6,500 light-years distant. The tower of gas that can be seen coming off the nebula is approximately 57 trillion miles (97 trillion km) high.
The brightest star in the nebula has an apparent magnitude of +8.24, easily visible with good binoculars.Martin
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Observing_field.jpg334 viewsMartin
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Lester.jpgMore data.256 viewsMartin
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IMG_0518.jpgnice view218 viewsnice viewMartinMay 21, 2016
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IMG_0517.jpgARB Kev269 viewsARB Kev.MartinMay 21, 2016
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IMG_0516.jpg208 viewsKev's CarMartinMay 21, 2016
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IMG_0515.jpg212 viewsJacki and carMartinMay 21, 2016
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IMG_0514.jpg215 viewsAlex's carMartinMay 21, 2016
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IMG_0513.jpg212 viewsScotty's carMartinMay 21, 2016
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IMG_0512.jpg220 viewsMark beside his carMartinMay 21, 2016
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IMG_0511.jpg216 viewsHang this in the ceiling and Mark will be out of business :PMartinMay 21, 2016
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