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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.
High resolution imaging techniques compared on Betelgeuse and Sirius
Credit: Giuseppe Donatiello
Between 2011 and 2015 I devoted myself with more resources to the experimentation of high resolution imaging techniques, both in the Visible and in the NIR. Then I gave up a bit "waiting for better times", aware of the instrumental limits. Nonetheless, the experiments carried out were published in well-known refereed specialized journals. However, sometimes I return to it with new data, especially to follow the motion of Sirius B around the main star since 2012.
Recently I have imaged Sirius and Betelgeuse with the homemade astrocamera MaxCam1280 and refractor 127ED@f/45.
On the left the images obtained with a common stack of superframes using the commercial software DENOISE#2 Pro. On the right the same superframes aligned manually with the open source PhotoScape X.
The stack has evidently produced an average of the single images with a certain degree of confusion. Instead, using the speckle technique the image is clearly more defined. Surprisingly, in the image of Betelgeuse a mysterious point source emerged unmistakably, almost in contact, well resolved in the best frames. I am sure that it is not an artifact.
For all the images I did NOT use any contrast filter or wavelets. They are raw.
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!
_____________________________________________
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 C?
Credit: Giuseppe Donatiello
Viewing some "superframes" of Sirius, I noticed the appearance of a point source in the same direction as Sirius B, the famous white dwarf companion of the star that was originally the main star of the system.
I remember having glimpsed this source, which I called C, also in other videos captured in the past years in one or two frames. Unfortunately some videos were lost with the HD failure in 2017.
I can say, with some confidence, that it is not an artifact but must really be a stellar source very close to the star Sirius A visible at times due to the seeing. This does not mean that the star is part of the system but, more likely, it is just aligned perspectively and much further away. I found it without a doubt in five frames out of 250.
It is also possible that in the past years the object was occulted and is now emerging due to the fast proper motion of the system.
I invite anyone who has captured videos of Sirio at a good focal length (at least 3000mm) to check it out.
ED127mm @f/27 + (DIY) MaxCam 1.3MP cooled CMOS
The information and annotations in the image are of scientific utility because they identify the subject and place it in a specific moment. They also indicate the subject of interest. The absence of such information makes the images useless.
Sirius B on March 15, 2019 at 19:40UT
Taken by Giuseppe Donatiello
TecnoSky SLD Apo 102/714 + MaxCam 3M (ROI) @f/35
(J2000) RA: 06h 45m 08.91728s Dec: −16° 42′ 58.0171″
Mag(v): Sirius A -1.47, Sirius B 8.44
Sirius system consisting of a white main-sequence star of spectral type A1V, termed Sirius A, and a faint white dwarf companion of spectral type DA2, called Sirius B. The distance separating Sirius A from B between 8.2 and 31.5 AU.
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.
Sirius B orbital motion2012-2015
ED127 @f/45 + DIY MaxCam 1280
AstroBin Image Of The Day
Each single source image, all taken with the ED 127mm refractor used at f/45 + ROI, is the result of the manual stack of 15-20 "super-frames" (ie of excellent quality) extracted for inspection and visual evaluation from films composed of 250 (therefore about 7% of the total). The individual subframes were manually aligned on the middle centroid (the large white disk that is seen is not Sirius, but his confusing figure!), And rotated until Sirius B matches the theoretical curve of the orbit, with good agreement. The image is therefore not a stack but a multilevel composition..
Sirius B
Taken by Giuseppe Donatiello
(J2000) RA: 06h 45m 08.91728s Dec: −16° 42′ 58.0171″
- Mag(v): Sirius A -1.47, Sirius B 8.44 -
Sirius is a star system and the brightest star in the nightsky with a visual magnitude of −1.46.
It is a binary star system, consisting of a white main-sequence star of spectral type A1V, Sirius A, and a faint white dwarf companion of spectral type DA2, called Sirius B. The distance separating Sirius A from B varies between 8.2 and 31.5 AU.
Sirius appears bright because of both its intrinsic luminosity and its proximity to Earth at 2.6 parsecs (8.6 ly).
Images are obtained using lucky and speckle imaging techniques.
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 star + Sirius B orbital motion
Credit: Giuseppe Donatiello
This composition represents a partial work based on data obtained between 2012 and 1015 in which the separation and displacement of Sirius B was perceived. From what I understand, it appears to be the first image ever produced to show this. Also reported in EOD n.16 iusse. [www.infoastro.com/dobles/oed16.pdf]
Each single source image, all taken with the ED 127mm refractor used at f/45 + ROI, is the result of the manual stack of 15-20 "super-frames" (ie of excellent quality) extracted for inspection and visual evaluation from films composed of 250 (therefore about 7% of the total). The individual subframes were manually aligned on the middle centroid (the large white disk that is seen is not Sirius, but his confusing figure!), And rotated until Sirius B matches the theoretical curve of the orbit, with good agreement. The image is therefore not a stack but a multilevel composition.
Photo of Sirius. B performing at Diana Wortham Theatre
Shot with a Nikon D4 and 45mm 2.8 tilt-shift. More on my blog:
www.derekolsonphotography.com/2012-artspace-after-hours-c...
model siriusb
thanks to Quarat RMX for the original pic
(plus a flemish painting whose author and title i can't recall)
soundtrack: stray
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.
Shot on 22 february 2016 with a SC11 f/10 telescope and ZWO 120mm-s camera, a 3X barlow lens (therefore f/30), a blue filter, and hexagonal mask. Sirius had reached its maximum elevation in the sky, 27 degrees, there was a full moon, but low atmospheric turbulence, and the temperature was -14C. Every winter for the last 5 years I have dedicated a few photo sessions to imaging Sirius B. Separating Sirius A and B, either visually or photographically, has always been a challenge, especially in higher latitudes where Sirius is low in the sky. Sirius A is the brightest star in the night sky and is 8.8 light-years away. It is the fifth closest star to us. Sirius B is a white dwarf star about the size of Earth that orbits A once every 50 years, reaching a maximum separation of only 11.3 arc-seconds. B has a brightness of magnitude 8.5, and should therefore be easily imaged normally. But since It is 10,000 times dimmer than A, it's light is drowned out by A's glare... most of the time. We are approaching the period of maximum separation, so it is the right time to try to get a peek at this elusive little star. This time I used an 11 inch telescope, a high performance planetary camera (ZWO 120mm-s), a 3X barlow, and an hexagonal mask. The mask channels A's blinding light away from the usual concentric rings that surround it into six strong spikes of brilliance, therefore increasing the chances of spotting B. The mask is positioned such that the theoretical position of B falls between two spikes. The mask clears a pathway to see B. The rest is all technique. By chance, atmospheric turbulence was low, which helps. This was the 6th photo session in four weeks dedicated to acquiring Sirius B; all five previous sessions had been unsuccessful. A higher exposure time increases the visibility of B, but also increases the size of A's glare. So a sweet spot has to be found between the two.
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Image réalisée le 22 février 2016 avec un télescope f/10 SC11 et une caméra ZWO 120mm-s, un barlow 3X (donc f/30), un filtre bleu, et un masque hexagonal. Sirius atteignait son élévation maximum dans le ciel, soit 27 degrés, il y avait une pleine Lune, mais peu de turbulence atmosphérique, et la température était de -14C. Chaque hiver depuis 5 ans, je consacre quelques séances photo à la détection de Sirius B. Séparer Sirius A et B, tant visuellement que photographiquement, a toujours été un défi reconnu, surtout dans nos latitudes où Sirius ne s'élève pas beaucoup au-dessus de l'horizon. Sirius A est l'étoile la plus brillante du firmament et se trouve à 8.8 années-lumière de nous. C'est la cinquième étoile la plus proche de notre système solaire. Sirius B est une naine blanche, environ de la taille de la Terre, qui trace une orbite autour de A à tous les 50 ans, atteignant une séparation maximale de 11.3 secondes d'arc. Sirius B a une magnitude (brillance) de 8.5 et devrait donc être normalement accessible à la photographie. Or, puisque sa luminosité est 10,000 fois moindre que celle de A, elle se perd dans l'éclat de celle-ci... la plupart du temps. Nous approchons de la période de séparation maximale, et le temps est propice pour tenter d'épier cette petite étoile furtive. Cette fois, j'ai employé mon nouveau télescope 11 po., une caméra haute performance ZWO 120mm-s, un barlow 3X et un masque hexagonal. Le masque canalise la lumière des anneaux concentriques entourant Sirius A vers six brillantes aigrettes, augmentant ainsi les chances d'apercevoir B. Le masque est placé de manière à ce que la position théorique de B se trouve entre deux aigrettes. Le masque balaie en sorte l'éclat de A, ouvrant le chemin pour la lumière de B. Le reste est question de technique. Par chance, la turbulence était minime ce soir-là, ce qui aide considérablement. C'était la sixième séance photo depuis 4 semaines dédiées à l'acquisition de Sirius B; les cinq précédentes ayant été infructueuses. Un temps de pose plus long augmente la visibilité de B, mais aussi la zone d'éclat de A. C'est donc un équilibre délicat entre les deux que l'on cherche.
I discovered that it was possible to take quick photographs of bright stars by dialing up the ISO sensitivity to 1250. Sirius, pictured here, turned out great. I'm going to try it out on Canopus and other very bright stars.
Taken through a 4.5-inch f/7.9 reflector at 72x.
Sirius (Alpha Canis Majoris) is the brightest star in the night sky. This is due to the fact that it is both very close (8.6 light-years) and very luminous. It is a blue giant that is quite a bit larger than the sun. Its companion, Sirus B, is a white dwarf remnant of a much larger previous star, and requires a telescope much bigger than mine to see. Here's a picture of the system: www.phys.boun.edu.tr/~semiz/universe/far/09ext/SiriusB.jpg
In Mali, West Africa, lives a tribe of people called the Dogon. The Dogon are believed to be of Egyptian decent and their astronomical lore goes back thousands of years to 3200 BC.
More details can be found here thekoolskool.blogspot.com/2011/04/invincible-dogons-id-cr...
Tears of Color is a annual fund raising event that provides live music and performances in an effort to bring awareness and raising funds for victims of sex trafficking. Asheville, NC.
Peter Lorenz 2011
Tears of Color is a annual fund raising event that provides live music and performances in an effort to bring awareness and raising funds for victims of sex trafficking. Asheville, NC.
Peter Lorenz 2011
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
Tears of Color is a annual fund raising event that provides live music and performances in an effort to bring awareness and raising funds for victims of sex trafficking. Asheville, NC.
Peter Lorenz 2011
Tears of Color is a annual fund raising event that provides live music and performances in an effort to bring awareness and raising funds for victims of sex trafficking. Asheville, NC.
Peter Lorenz 2011
Tears of Color is a annual fund raising event that provides live music and performances in an effort to bring awareness and raising funds for victims of sex trafficking. Asheville, NC.
Peter Lorenz 2011
Tears of Color is a annual fund raising event that provides live music and performances in an effort to bring awareness and raising funds for victims of sex trafficking. Asheville, NC.
Peter Lorenz 2011
Tears of Color is a annual fund raising event that provides live music and performances in an effort to bring awareness and raising funds for victims of sex trafficking. Asheville, NC.
Peter Lorenz 2011
Tears of Color is a annual fund raising event that provides live music and performances in an effort to bring awareness and raising funds for victims of sex trafficking. Asheville, NC.
Peter Lorenz 2011