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Thread: Three sketches of Sirius B with Paint.

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    John Baars's Avatar
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    Default Three sketches of Sirius B with Paint.



    Sirius B was spotted on 23, 24 and 25 februari in the 120mm f/7.5 Evostar ED APO.

    https://www.flickr.com/photos/169707...posted-public/



    Magnification from left to right: 65, 100 and 200X. It is obvious that at increasing magnification the atmospheric seeing is magnified too. At 200X I had to hold Sirius A behind the fieldstop of the eyepiece (curved black area) in order to see the small companion. Sirius B is the small speckle at 7 or 8 o'clock.

    Used eyepieces:
    At 65X : Baader Morpheus 14 mm.
    At 100X: Fujiyama 9 mm.
    At 200x: Fujiyama 9 mm. and Zeiss Barlow 2X.
    Telescopes in Schiedam : SW 150 F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
    Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.
    Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.
    Amateur since 1970.

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    Default Re: Three sketches of Sirius B with Paint.

    Hello John,

    this is a perfectly documented observation of Sirius B!
    Thank you very much,

    JG
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    Default Re: Three sketches of Sirius B with Paint.

    Quote Originally Posted by John Baars View Post
    Sirius B was spotted on 23, 24 and 25 februari in the 120mm f/7.5 Evostar ED APO.

    https://www.flickr.com/photos/169707...posted-public/



    Magnification from left to right: 65, 100 and 200X. It is obvious that at increasing magnification the atmospheric seeing is magnified too. At 200X I had to hold Sirius A behind the fieldstop of the eyepiece (curved black area) in order to see the small companion. Sirius B is the small speckle at 7 or 8 o'clock.

    Used eyepieces:
    At 65X : Baader Morpheus 14 mm.
    At 100X: Fujiyama 9 mm.
    At 200x: Fujiyama 9 mm. and Zeiss Barlow 2X.
    Nice sketch John! I had a chance to revisit the Pop this weekend. Seeing did not cooperate, and it was not visible in direct view. I had to use the same trick and block Sirius A with EP edge at 219x in my 8" SCT. The sharp dot of Sirius B was well defined, but somehow seemed further away from A than reported 11.1". The PA was right, and according to SS6p (which plots all stars down to mag 14) there was no field star which could be mistaken for the Pop. I also did 360 deg scan blocking Sirius A at 45 deg intervals, and that was the only star visible close to Sirius A. Anyone else had similar impression?
    Last edited by Bigzmey; 02-26-2019 at 10:16 PM. Reason: added a bit more info

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    Default Re: Three sketches of Sirius B with Paint.

    Pity I didn't see this post earlier, otherwise I would have tried to measure the distance from the middle of Sirius to B with a caliper at armlength. ( both eyes open) You can do this yourself of course.
    11.1" at 219X is 2431 arcseconds, which is circa 1.35X the diameter of the full moon. As we measure the full moon with the naked eye and a caliper at arm length we read 0.5 cm. Very course measurements of course , but it gives an impression of what we are talking about. With both eyes open and the caliper held at arm length the pup should be at 0.65 cm from the main star or so.
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    Telescopes in Schiedam : SW 150 F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
    Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.
    Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.
    Amateur since 1970.

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    Default Re: Three sketches of Sirius B with Paint.

    Quote Originally Posted by John Baars View Post
    Pity I didn't see this post earlier, otherwise I would have tried to measure the distance from the middle of Sirius to B with a caliper at armlength. ( both eyes open) You can do this yourself of course.
    11.1" at 219X is 2431 arcseconds, which is circa 1.35X the diameter of the full moon. As we measure the full moon with the naked eye and a caliper at arm length we read 0.5 cm. Very course measurements of course , but it gives an impression of what we are talking about. With both eyes open and the caliper held at arm length the pup should be at 0.65 cm from the main star or so.
    I must be missing something. How would you use caliper at arm length (or at any length) while you looking at Sirius A and B through EP?
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    Default Re: Three sketches of Sirius B with Paint.

    You are not missing a thing.
    You look at Sirius with one eye. And at the caliper with the other. Amazing what eyes can do. You have to look a little bit cross-eyed. Should be easy since one looks a bit cross-eyed reading this screen too. Its like looking through the left half of binoculars with your right eye and opening your left eye too. Surely you have done this before to check or compare magnification? It is not really a problem.

    Having a diagonal is easier, for you already look down and have enough space to hold the caliper at arm length. Maneuvering the caliper in the right position might be more challenging, but not that difficult either. Just have a try:-)
    Telescopes in Schiedam : SW 150 F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
    Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.
    Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.
    Amateur since 1970.

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    Default Re: Three sketches of Sirius B with Paint.

    Quote Originally Posted by John Baars View Post
    You are not missing a thing.
    You look at Sirius with one eye. And at the caliper with the other. Amazing what eyes can do. You have to look a little bit cross-eyed. Should be easy since one looks a bit cross-eyed reading this screen too. Its like looking through the left half of binoculars with your right eye and opening your left eye too. Surely you have done this before to check or compare magnification? It is not really a problem.

    Having a diagonal is easier, for you already look down and have enough space to hold the caliper at arm length. Maneuvering the caliper in the right position might be more challenging, but not that difficult either. Just have a try:-)
    Sounds like instant migraine, but I may give it a try. After splitting that many doubles I feel I could eyeball distances fairly well. Uneven pairs, in particular with bright stars (like with Sirius) could be more problematic. When I need a point of reference I check distances between the field stars in EP FOV using SS6p and compare them to the double I am splitting. In case of Sirius there were two stars in the FOV 51.7" apart, so Sirius A and B should be roughly at 4-5x less separation.
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    Default Re: Three sketches of Sirius B with Paint.

    Quote Originally Posted by Bigzmey View Post
    (...) When I need a point of reference I check distances between the field stars in EP FOV using SS6p and compare them to the double I am splitting.(..)
    I seldom do that, but I think it is a very good idea! Thanks!
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    Default Re: Three sketches of Sirius B with Paint.

    Hi John. A very nice sketch of Sirius and the "Pup", as well as the PA (positional angle) and distance measurements that you used. This is great work John, and thanks for sharing this with us on here.
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    Default Re: Three sketches of Sirius B with Paint.

    Last edited by John Baars; 03-27-2019 at 04:42 PM.
    Telescopes in Schiedam : SW 150 F/5 Achromat, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 maksutov F/14.3, SW 102MAK F/13 on Vixen GPDX.
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