There are about , stars in the Hercules Globular Cluster. To photograph such an object from home is truly a remarkable feat. Globular star clusters like M13 can be photographed during nights with moonlight, as they are not as affected by moon glow as dim nebulae and galaxies are. This telescope was lent to me from Explore Scientific to use in my backyard and report back with what I think. Needless to say, I was thoroughly impressed with the astrophotography performance of this fast, carbon fiber APO.
The video above covers some of the features of the ED, and gives you a behind-the-scenes look at capturing my latest image of M The added resolution and light-collecting power of this massive refractor allowed me to photograph a deeper view into M13 than ever before.
I used a Baader Moon and Skyglow filter to reduce the negative effects of light pollution in my second exposures.
The camera was controlled using Astro Photography Tool , where I was able to control utilize the TEC feature of this one-shot-color camera. I cooled the camera sensor down to C, and used the Unity Gain setting during my imaging session. In total, I collected x 1-minute subs. The image above includes 2 hours and 9 minutes of total integrated exposure time.
The images were dithered between each frame, which really helps reduce noise when shooting a large sequence of images. Star clusters are a great astrophotography target to shoot when the moon is out and can be enjoyed using a one-shot-color camera such as a DSLR or dedicated astronomy camera. Baader Moon and Skyglow Filter.
In my 4-inch refractor, from a suburban location, M13 was always on the threshold of being resolved, but never quite to my satisfaction. At x it appeared as a grainy snowball of congealed light, prickling with faint stars that popped in and out of view depending on which side of the cluster I was looking at. At medium powers 90x — x I was able to resolve pinpoint stars in both direct and averted vision right across the face of the cluster, giving an impressive sense of scale and distance.
Overall, the Great Cluster looked like a sprawling sea monster compared to the more condensed M5, with prominent chains of stars curving out from the center. Again, as mentioned earlier, if your scope can reach as deep as 15th magnitude then M13 will show you hundreds of stars. Use higher magnifications from x to x and averted vision to draw out these fainter stars from the cluster.
Now look more closely and you should be able to see a dark Y-shaped feature just southeast of the core. If you can tear your gaze away from this captivating spectacle for long enough, look out for a faint smudge of light half a degree to the northeast of M13 a wide-field eyepiece will show it in the same field of view. This is the 11th magnitude galaxy NGC which — at 30 million light-years — is some 1, times farther away than its starry neighbor.
I recently used a Powermate to observe M13 at a whopping x. The stars were a little mushy because of the seeing, and at this magnification, it looked less like a sea monster and more like a hanging basket brimming over with unruly flowers. But for a few fleeting moments when the seeing did stabilize, I was treated to the unforgettable sight of an entire field of view sprinkled with ancient starlight. Have a look and decide for yourself if it really is the best globular cluster in the northern sky.
Table Of Contents. How Difficult is M13 to Find and Observe? Several filters were used to sample broad wavelengths. The color results from assigning different hues colors to each monochromatic image. Object Description The type of astronomical object. Position Right ascension — analogous to longitude — is one component of an object's position. Position Declination — analogous to latitude — is one component of an object's position.
Constellation One of 88 recognized regions of the celestial sphere in which the object appears. Distance The physical distance from Earth to the astronomical object. Distances within our solar system are usually measured in Astronomical Units AU. Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs. Dimensions The physical size of the object or the apparent angle it subtends on the sky.
About The Data Data Description Proposal: A description of the observations, their scientific justification, and the links to the data available in the science archive.
Science Team: The astronomers who planned the observations and analyzed the data. Instrument The science instrument used to produce the data.
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