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Maybe Not So Little!
What a marvel of creation ..
with a little bit of artistic licence!
Sirius A is the brightest star seen from Earth.
Taken on a clear February evening on the Isle of Wight near Shorwell.
I took the opportunity on March 1st to try and capture an image of Sirius and the Pup, the companion white dwarf to the brightest star in the sky (besides the Sun). I chose to use the Meade 12” LX-90 and the ZWO ASI290MC camera to tackle this image. Information from Stella Doppie (www.stelledoppie.it/index2.php?iddoppia=27936) was showing the Pup at a distance of 11.193 arc-seconds from Sirius, the next few years are prime for imaging the Pup as it is approaching its maximum distance from Sirius.
The snapshot shown was taken from inside SharpCap (v3.2) using a GAIN of 109 and exposure setting of 0.986 seconds. To help confirm this was the companion to Sirius, the camera was rotate to make sure the Pup rotated with the camera.
Using the CCD Calculator tool from Astronomy Tools (astronomy.tools/calculators/ccd), the resolution of the photograph was calculated to be 0.2"/pixel (using a 2.9 um CCD pixel size and a 3,048mm focal length). Measuring the pixel distance from the center of Sirius A to what I believe is Sirius B shows a calculated distance of 12.6 arc seconds, which is close to the predicted 11.193 separation provided by Stella Doppie.
Additional details including a video can be found at this link:
sites.google.com/view/thedarksideobservatory/deep-sky-ast...
Tech Specs for all images and video: Meade 12” LX-90, ZWO ASI290MC camera. Captured using SharpCap v3.2. Image date: March 1, 2020. Location: The Dark Side Observatory, Weatherly, PA, USA.
Sirius is the brightest star in the night sky and it is also known as the “Dog Star” because it is part of the constellation Canis Major (the Great Dog). However, few people probably know that the star Sirius is actually a double star with a much fainter companion officially known as Sirius B or more commonly as just the “Pup.”
The video above which was taken with a 5” refractor on February 15, 2016 shows the “Pup” star immediately below the much brighter Sirius A.
The “Pup” is difficult to see even with a telescope because it is so close to the dazzlingly bright Sirius A. The ratio in brightness between the two stars is about 10,000 to 1 (a magnitude difference of 10) and currently these stars have an apparent separation of just over 10 arc seconds. The image scale of the video is about 0.4 arc seconds per pixel.
All rights reserved.
Hello Flickr friends! Feb. 20 is "Love Your Pet Day." To celebrate, we looked up the top seven pets and searched for space images for each animal. And here we are at #1: the faithful Dog, Man's best friend. In honor of canines everywhere, here's the double star Sirius system, located in the constellation Canis Major (the Great Dog).
Now that one "Rover" has claimed the top spot, here's a bonus history image of the lunar rover on the moon: www.flickr.com/photos/nasamarshall/8250804489/in/set-7215... (I know, very cheesy joke...but hey, dogs love cheese!)
Caption: An X-ray image of the Sirius star system located 8.6 light years from Earth. This image shows two sources and a spike-like pattern due to the support structure for the transmission grating. The bright source is Sirius B, a white dwarf star that has a surface temperature of about 25,000 degrees Celsius which produces very low energy X-rays. The dim source at the position of Sirius A – a normal star more than twice as massive as the Sun – may be due to ultraviolet radiation from Sirius A leaking through the filter on the detector.
In contrast, Sirius A is the brightest star in the northern sky when viewed with an optical telescope, while Sirius B is 10,000 times dimmer. Because the two stars are so close together Sirius B escaped detection until 1862 when Alvan Clark discovered it while testing one of the best optical telescopes in the world at that time.
The theory of white dwarf stars was developed by S. Chandrasekhar, the namesake of the Chandra X-ray Observatory. The story of Sirius B came full cycle when it was observed by Chandra in October 1999 during the calibration or test period.
The white dwarf, Sirius B, has a mass equal to the mass of the Sun, packed into a diameter that is 90% that of the Earth. The gravity on the surface of Sirius B is 400,000 times that of Earth!
Image credit: NASA/SAO/CXC
Original image: chandra.harvard.edu/photo/2000/0065/index.html
Read more about Chandra:
p.s. You can see all of our Chandra photos in the Chandra Group in Flickr at: www.flickr.com/groups/chandranasa/ We'd love to have you as a member!
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These official NASA photographs are being made available for publication by news organizations and/or for personal use printing by the subject(s) of the photographs. The photographs may not be used in materials, advertisements, products, or promotions that in any way suggest approval or endorsement by NASA. All Images used must be credited. For information on usage rights please visit: www.nasa.gov/audience/formedia/features/MP_Photo_Guidelin...
Sirius is the brightest star in the night sky and it is also known as the “Dog Star” because it is part of the constellation Canis Major (the Great Dog). However, few people probably know that the star Sirius is actually a double star with a much fainter companion officially known as Sirius B or more commonly as just the “Pup.”
The video above which was taken with a 5” refractor on February 15, 2016 shows the “Pup” star immediately below the much brighter Sirius A.
This is an edit of an earlier upload where here I've only included the best frames from the video sequence.
The “Pup” is difficult to see even with a telescope because it is so close to the dazzlingly bright Sirius A. The ratio in brightness between the two stars is about 10,000 to 1 (a magnitude difference of 10) and currently these stars have an apparent separation of just over 10 arc seconds. The image scale of the video is about 0.4 arc seconds per pixel.
All rights reserved.
This picture is an artist's impression showing how the binary star system of Sirius A and its diminutive blue companion, Sirius B, might appear to an interstellar visitor.
The large, bluish-white star Sirius A dominates the scene, while Sirius B is the small but very hot and blue white-dwarf star on the right. (White dwarfs are the leftover cores of stars similar to our Sun.) The two stars revolve around each other every 50 years.
The Sirius system, only 8.6 light-years from Earth, is the fifth closest stellar system known. Sirius B is faint because of its tiny size. Its diameter is only 7,500 miles, slightly smaller than Earth. The Sirius system is so close to Earth that most of the familiar constellations would have nearly the same appearance as in our own sky. In this rendition, we see in the background the three bright stars that make up the Summer Triangle: Altair, Deneb, and Vega. Altair is the white dot above Sirius A; Deneb is the dot to the upper right; and Vega lies below Sirius B. But there is one unfamiliar addition to the constellations: our own Sun is the star shown as a small dot just below and to the right of Sirius A.
For more information, visit: hubblesite.org/contents/news-releases/2005/news-2005-36.html
Credit: NASA, ESA, and G. Bacon (STScI)
Sirius A - the brightest star in Earth's night sky. It's 8.6 light years away and is between 200 and 300 million years old. Sirius A is about twice as massive as the Sun. The white dwarf star Sirius B is very hard to capture due to the glare from Sirius A and I don't think it's visible in this shot.
Taken the last time we had some halfway decent weather (Jan 26th 2017). Single 10 second shot at 400 ISO. Taken with Canon 700D on Skywatcher 150 PDS with EQ5 mount. Processed in Photoshop.
Se você conhece ao menos um pouco do céu, conhece ou já ouviu falar da estrela Sirius. É a estrela mais brilhante do céu. E um fato interessante é que ela não é apenas uma estrela, são duas: Sirius A e Sirius B. Elas estão relativamente próximas à terra (8,6ly). A que vemos a olho nu é a Sirius A, mais quente e 1,7 vezes maior que nosso Sol. Sirius B é bem menor e leva aproximadamente 50 anos para completar uma volta ao redor de Sirius A. Estamos no período em que as estrelas estão mais afastadas, o que nos permite captar imagens de ambas, sem que a luz de Sirius A se misture com a luz de Sirius B. Logo farei imagens dela com um telescópio refrator, assim espero que a separação delas fique mais clara, sem os spikes (cruz).
If you know a little of the nightsky, you know or heard of Sirius star. It's the brighest star in the nightsky. An interesting fact is that it isn't a single star, but two: Sirius A and Sirius B. They are relatively next to the Earth (8,6ly). We only see Sirius A with the naked eye and it is hotter and 1,7 times bigger than our Sun. Sirius B is smaller and takes aproximately 50 years to complete its orbit around its companion star. We are in a specific period of time that the two stars are apart from each other, which alow us to capture images from both of them, without Sirius A light merge with the light from Sirius B. Soon I'll be doing some pictures with a refractor telescope and I hope that the separation between them become more appearent without the refraction spikes.
Sky-Watcher 200p, Skywatcher Eq5 mount with AstroEQ mod, Asi290mc. First pic primary focus, second pic with a 2x barlow lens. Were made some videos and the best frames were stacked in Autostakkert and treated on photoshop.
#astrophotography #astrofotografia #nightsky #stars #astronomy #astromomia #space #Siriusa #telescopio #telescope #skywatcher #skywatcher200p #siriusb #Eq5 #skywatcherEq5 #AstroEq #orionnebulae #adobephotoshop #asi290mc #ZwoAsi #zwoasi290mc #pipp #autostakkert #registax #astfotbr
This is a video showing Sirius A and companion Sirius B.
This video was taken at the Winter Star Party in the Florida Keys on March 1st, 2011 by Brian G. Shelton using a Royce 12.5" Dall-Kirkham telescope.
Get Celestia NOW.
Bajaos el Celestia HOY mismo.
www.shatters.net/celestia/download.html
cel://Freeflight/2373-05-16T13:01:04.50581?x=AAAIQrF4aIgpbOf//////w&y=AAD0e4mmytlPcaz//////w&z=AADcn6ua6fcaEZ7//////w&ow=0.039581&ox=0.264183&oy=0.869721&oz=-0.415001&select=Sirius A&fov=5.114572&ts=1000000000.000000<d=0&rf=840855&lm=22