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 Post subject: Iris & Uranus
PostPosted: Sat Nov 18, 2017 1:47 pm 
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Joined: Sun May 11, 2008 6:11 pm
Posts: 3303
Location: Portslade, Sussex Lat 50deg 51min Long 0deg 13mins West
17th November 2017: 2045 - 2210 GMT: Used 6.5x32 Helios waterproof binocular to view both URANUS and IRIS which are only about 10 degrees apart. The "given" fov of this instrument is 8.2 although I believe that it is slightly less than 8 degrees. [Capella & Menkalinan just fit and so do Betelguese & Bellatrix.] Although IRIS (at about magnitude 7) and Uranus (at about magnitude 6) obviously do not fit the same fov, it is easy to scan from one to the other. The sky was beautifully clear and Aries+Pisces high in the sky. regards maf


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 Post subject: Re: Iris & Uranus
PostPosted: Sun Nov 19, 2017 10:00 am 
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Joined: Sat Jan 26, 2008 4:03 pm
Posts: 596
Location: Galloway, SW Scotland
Thanks, Mike, for the tip off. I was observing last night, too, but I didn't think of Uranus! The next few nights are forecast cloudy..... :(

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Skywatcher 350P f4.65, Skywatcher StarTravel 102 f5, Adler Optik 9x63 binoculars


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 Post subject: Re: Iris & Uranus
PostPosted: Sun Nov 19, 2017 5:07 pm 
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Joined: Sun May 11, 2008 6:11 pm
Posts: 3303
Location: Portslade, Sussex Lat 50deg 51min Long 0deg 13mins West
Sunday 1655 GMT. Mostly cloudy now but clear band under cloud layer, low in the west. Just scanning with 12-36x50 and.....crashed into...SATURN! By 1720 GMT had set behind the bushes on Southwick Hill.
However, the eastern sky is now also clear, so view from the opposite window reveals again URANUS in Pisces and IRIS paired neatly with a star below gamma Arietis. At 1740 GMT. One really does have to grab the opportune moment in this skywatching hobby! regards maf


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 Post subject: Re: Iris & Uranus
PostPosted: Mon Nov 20, 2017 10:12 am 
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Joined: Fri Dec 03, 2004 2:41 pm
Posts: 1462
Location: 55° 57'N: 03° 08'W
For Mike: I calculate the separation of alpha/beta Aur as 7°.577
and for alpha/gamma Ori as 7°.530.
So your FOV is slightly less than 8°.


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 Post subject: Re: Iris & Uranus
PostPosted: Mon Nov 20, 2017 11:46 am 
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Joined: Sun May 11, 2008 6:11 pm
Posts: 3303
Location: Portslade, Sussex Lat 50deg 51min Long 0deg 13mins West
Thank you for that information stella. I roughly worked it out by measuring it on the Uranometria maps. It is good to know the correct figure. regards maf


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