andrew s

Sorry if this is a repeat but it is absolutely amazing. https://www.sciencealert.com/the-footage-from-the-first-spacecraft-to-fly-through-the-sun-s-corona-is-insane?utm_source=ScienceAlert+-+Daily+Email+Updates&utm_campaign=b09d0fe6c0-MAILCHIMP_EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_fe5632fb09-b09d0fe6c0-366018145 Regards Andrew

Nice story, technology (100") , theory and experimental science going hand in hand. Regards Andrew

They are star forming regions with lots of hot blue stars. They are very common in spiral arms. Certainly, not a processing issue. Regards Andrew

Not an easy task well done. Regards Andrew

Jewelry for the middleaged man. 💍💎💍

Distant events are time dilated but on anything, like that scale. It is seen in the shape of supernova light curves. Regards Andrew

This is not a simple question If I have understood this correctly it is, for non gravitationally bound objects, the particle horizon which will get to more than 60 glyrs in the current cosmological model and as time tends to infinity. So we will see objects fade away as they get more and more red shifted. Regards Andrew PS the link is to a pdf that downloads .

As we look back we can see transitory events particularly super or hyper novae. One milestone will be to see the first generation of massive stars explode. Regards Andrew

@ollypenrice as I understand it when using a telescope you relax your eye to focus on infinity and adjust the focus to that. If turbulence causes focus shift the eye can compensate to a degree but causes fatigue. My eyes focal range is from infinity to 1m or so now without glasse Looking forward to your surgeon insight. Regards Andrew

Not sure this is totally correct. A camera is fixed focus and integrates over the exposure. The eye/brain is adaptive and has a short integration time and the eye can "auto" focus. Having said that the outcome in any given circumstances is not at all obvious to me. Regards Andrew

Strehl ratio can be misleading. Would you prefer a 1mm objective with 99.9999 Strehl or 100mm objective or 300mm mirror with Strehl of 85.00. Just to make up some numbers. It is a ratio of theoretical to actual performance but theoretical performance depend on aperture and other factors. Regards Andrew

I always used "Brains" from Thunderbirds as a role model! 😊😉 Regards Andrew

Sorry that's pure prejudice 😊 To me the 100" and 200" are classics of old school astronomical engineering. On a smaller scale the Questar comes to mind. Regards Andrew

You don't have to read threads if you don't want to. It's not compulsory. 😱 Regards Andrew

I have pondered on this and while it is the whole set that makes the system sing (mount, scope, cameras, focuser, observatory etc.) . In the end it came down to the software, The Sky X, Voyager and the AAG weather watcher. (Sorry @ollypenrice.) They have enabled me to schedule a nights observation and run it safe in the knowledge that the roof will close in bad weather and it will otherwise perform as requested. I can be at home, the theater on holiday or babysitting the grandchildren it matters not as long as I could get on the internet at some point during the day. Regards Andrew

They both don't refer to correct optics what ever way you go check it will work with an ODK. Regards Andrew

I think the correction optics will stop it working although I have not tried it. Regards Andrew

I would need very long arms as I am near Chester in the UK and the mount is in Castillejar Spain. My experience is that you need kit designed for remote operation and a person (Dave in my case) on hand to replug USB ports on the rare occasion it's needed. Regards Andrew PS or to switch on the PC again when you told it to shut down when you intended restart😫

Artificial stars are good for collimation but if they are too close back focus can be an issue and in addition will show aberations which don't effect collimation but do effect apparant optical quality. Regards Andrew

Rocket science is simple compared to weather forecasting. The atmosphere can be in a chaotic state and water is not that far from its triple point. Add a small land mass close to on ocean and it a recipe for... ...well you know. Regards Andrew PS gives us something to talk about. 😊

Fascinating, if not as original as they claim. Solid Schmidt designs were described by A. S. DeVany in "Master Optical Techniques " published in 1981. Although then the aim was f1 cameras and faster. That was in the days when I aspired to make my own optics. It soon passed as I don't have the right temperament! Regards Andrew

I assume your using an EQ mount. I don't think it's related to the current issues but it's best to avoid Az0 as the mount could get there with the scope E or W of the meridian which could confuse the firm/software. Regards Andrew

Not used this system but could it be related to the end of BST? Regards Andrew

They have been looking to confirm an anomaly for 10 yrs so probably not. However, I am sure the search for new physics won't stop. There are many experiments on going looking for dark matter particles. Regards Andrew PS good luck at Screwfix 😊

Just watched the above on iplayer where they pin their hopes of new physics on finding evidence for the sterile neutrino. Unfortunately, it seems Fermi lab have failed to do so from this announcement a few days ago https://phys.org/news/2021-10-scientists-hint-sterile-neutrino.html Regards Andrew