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Skysafari lists Delta2 Lyrae as a double, with magnitudes 4.28 & 11.20, But search stelledoppie.it
and this is a summary of the result; a multiple with 11 components potentially visible in an amateur scope.
This is my plot of the above data.
With a 200p F/5 in Bortle 8 skies/ average seeing, I have seen the 6 brightest components to mag 10.30. The mag 11.20 should be doable but has eluded me so far.
I think that for my setup, the dimmest 4 stars will need darker skies or better eyes 😀
If you are observing Delta2 Lyrae, how many components can you identify?
Can anyone confirm (or refute) - have I imaged Ganymede and Europa in orbit around Jupiter or is that just wishful thinking? (Only equipment used was a Lumix G7 with 150mm zoom lens - effectively 300mm with 2x crop factor - and of course a tripod).
It appears to be the case and yet I can't quite allow myself to believe it...
Thanks from an old newbie.
Just thought I would say hi to everyone.
I am a Noob, but have been googling astronomy for past year, so am familiar with some of the lighter terminology.
Most of my googles have directed me to this site, so I have already read forum posts here numerous times.
Have already acquired quite a bit of kit, but just not found the time to try it out yet.
This should hopefully change soon as I am expecting to have a lot more spare time in a couple of months.
Being in the Midlands in the UK, I am not currently missing much, due to the current cloudy weather here.
I am looking forward to picking your brains and in time posting some of my experiences here.
I have just joined and have been looking around, and putting in various searches to find the answer to my question(s).
I have already found some valuable information, but i can't find a specific answer to a question i have relating to exposure times.
I have shot the milky way several times before, from a tripod and a wide angle lens. I am aware of and understand the "500 rule" and that worked fine for me at first when i was shooting with my Canon 6D Mark II. When i moved over to the Sony A7III i noticed significant trailing using the same rule and that led me to the NPF rule (Via the photopills app incase people dot know).
I am heading back to Tenerife once again in about 6 weeks time and want to buy a star tracker so i can get some really detailed images.
I have done a fair bit of research and in principle, the whole thing doesn't seem to be too daunting or difficult.
I have purchased the Polar Scope Align Pro app so i can align Polaris as accurately as possible, i will practise putting the unit together and familiarising myself with the different parts etc, but it is the exposure times that i do not understand.
My best glass is the Carl Ziess 50mm F/1.4 Planar, the 18mm F/2.8 Batis, the Sigma 35mm F/1.4 Art & the IRIX 15mm F/2.4 Blackstone.
I currently do not own, nor have i ever used a tracker, and I cannot find any information relating to which aperture, ISO and Shutter length any of these focal lengths should or could be shot at.
Is there anything similar to the 500 rule or NPF rule that relates to using a tracker with varied focal lengths? or is it just a case of stepping the lens down for sharpness and then trial and error?
Thanks in advance,
I'm a complete beginner and have a similar question. I'm thinking of buying a Celestron astro fi 130mm newtonian telescope what would I expect to see and what clarity? https://www.celestron.com/products/astro-fi-130mm-newtonian-telescope
Can't wait to get a telescope and explore the skies.