wookie1965

http://web.archive.org/web/20170419050003/http://astronomy.eaglecreekobservatory.org/doubles/

Here you go this Link works.

Well the Tal is F10 and the Meade is F9. 3 probably why I have not noticed it.

15 minutes ago, Astro-Geek said:

 

........But isn't chromatic aberration another important consideration though ?

My understanding is that reflectors are automatically free of CA because of the surface silvered mirrors, whereas refractors need to be of the much more expensive Apochromatic ED glass to not suffer significantly from it.

A 5" Apo ED is way more expensive than even an 8" Newtonian.

I have a Tal 100rs and a Meade lxd55 127 emc Achromatic s I have not noticed any CA on either of them.

I was thinking about getting a 6" reflector like my first scope I will stick with the 5" Refractor and save money thanks John.

So a 5" Refractor is as good as a 6" reflector and a 6" Cassegrain.

I give up with mine I use a zoom lens now quicker and since I have been really accurate.

18 minutes ago, mapstar said:

It was a good social event but poor for astronomy. James did a cracking job 

Must be a site around there with better views we could have an informal meet up.

Just now, estwing said:

Lp was issue...and cake theft!

We don't have to go the same camp though find a better place.

I loved psp we should do a meet somewhere there informally and meet up again.

16 minutes ago, Marvin Jenkins said:

I love it all. Don’t wish for failure but blowing ‘stuff’ up is part of the fun. Good luck with the flight. Please post on this thread, I would love to see the end result. A grade, for your grand daughter I hope.

Marv

I will certainly post the video I hope she gets a good grade for the project although last time about the Romans we made a helmet shield and sword did 3 pages of writing extra drawings and got 15/30 I was fuming we had done above and beyond what they asked for.

28 minutes ago, fozzybear said:

Just seen your location I used to work at the sandcastle (Royal Insurance) if they are still there? back in the 90's

I live in St. Helens Merseyside to be honest I don't know Sandcastle (Royal Insurance) so I could not tell you if they are still going I would have to Google them.

Congratulations on your upcoming grand parenthood your in for a treat.

Thank you for everything I really appreciate it.

I am going to make one of those we have a park 2 minutes away I will video it, get my son help me and my granddaughter will love it.

I would love to but I want the school think she has done it herself why did you have something in mind

recipes.sainsburys.co.uk/articles/fun-stuff/transform-a-bottle-into-a-rocket-in-6-easy-steps.

Following this don't want it to be too elaborate especially as she is supposed to do it herself.

7 minutes ago, fozzybear said:

Mercury 0.387 193.0 seconds or 3.2 minutes

Venus 0.723 360.0 seconds or 6.0 minutes

Earth 1.000 499.0 seconds or 8.3 minutes

Mars 1.523 759.9 seconds or 12.6 minutes

Jupiter 5.203 2595.0 seconds or 43.2 minutes

Saturn 9.538 4759.0 seconds or 79.3 minutes

Uranus 19.819 9575.0 seconds or 159.6 minutes

Neptune 30.058 14998.0 seconds or 4.1 hours

Pluto 39.44 19680.0 seconds or 5.5 hours

Time for the sun to reach  each of the planets so if we subtract 8.3 minutes from the above that is a rough guide as to how old each planet is  as per Jupiter 43.2 minutes and then subtract 8.3 minutes = 34.9 minutes ago from good old earth etc

 

There in front of me but I'm going around the hard way thank you so much.

Brilliant thanks Now how do I work out if I am looking at Jupiter is that the same because light illuminates it or is it shorter because earth is closer the same goes for all the other planets.

I'm trying to find out how long light takes to get to each planet sounds easy but then want to say like the sun we see 8 minutes back in time what is it for each plane. So like we look at Jupiter how old is the image.

Doing this with granddaughter who is 9 just adding for extra marks we have done moon phases and how we get seasons going to do the time taken and a bit on super novas producing heavier elements make a rocket then we are done.

if any one can give the answers or point to a couple of websites I would really appreciate it thanks.

I have never known September and October to be so wet it has constantly rained I have had 2 sessions out in 10 weeks its ridiculous, more of the same this weekend say the forecasters we have 2 days of respite not long enough. 

Quite a list there great to work through the brighter ones some of the Nebula`s I wont see from home. 

24 minutes ago, estwing said:

Get thee sen up there.

I would but the weather looks great tonight and tomorrow then breaking again with rain forecast for the weekend so there is no point wish I had gone this weekend and stayed until tomorrow.

Did you find a solar filter for me I'm gutted cannot pick it up at the party a real shame. All your hard work sorry its come to this.

On 26/10/2019 at 20:01, FLO said:

That is 154mm diameter. I will check our stock of Astrozap solar filters when we reopen Monday. 

Steve 

Thank you very much really appreciate it.

Paul

Definitely wish I was there now SGL has been cancelled due to flooding.

Really disappointed but I had an inkling when said they would appoint pitches when you get there.

Going have to look at Buxton or North Wales now for a weekend.

Thank you all for your hard work organising this feel every sympathy for you and everyone who was attending.

17 minutes ago, bond19 said:

I (think) I had the secondary collimated using the colli cap. Then I inserted the laser to align the secondary with the laser dot in the centre of the primaries doughnut. So far all good. Then I collimated the primary using the laser. Again all good. Finally I reinserted the colli cap to check and everything seems massively off 😞

That will be the laser out do what you did again but this time use the laser Barlow method to do the primary.

If I was closer I would come and show you, depending on the laser collimator you have that may need collimating if it's a cheaper one it more than likely will but you could use the Barlow method. Read these they will help.

http://www.schlatter.org/Dad/Astronomy/collimate.htm

http://www.smartavtweaks.com/RVBL.html

Just take your time once you have the secondary in place you won't have touch that again unless you drop the OTA.