SteveBz

So I used nou's script here for the first 3. https://gitea.nouspiro.space/nou/astro-soft-build Which works perfectly. What did you use for PHD2? Kind regards Steve

Are you presenting?

Hi Andy, Great job, but help me here. What did you do? This what I think you did, please tell me if I'm wrong: 1 - Bought two RAA Muon Detector kits here: https://www.ukraa.com/store/categories/cosmic-rays/muon-detector-kit. 2 - And two enclosures here: https://www.ukraa.com/store/categories/cosmic-rays/muon-detector-enclosure. 3 - Assembled them both; 4 - Tested them with the Beta particles from a naturally occuring K40 source (bananas); Is that right? How do you then test for actual cosmic ray muons, and how do you distinguish between Muons and Beta particles? Total cost was about £328? Kind regards, Steve.

Flat rotation curve and dark matter aren't really the same thing. You got a flat rotation curve - amazing, but there are other explanations to the flat rotation curve such as MOND (Modified Newtonian Gravity/ Milgromian Gravity) or Quantised Inertia. Honestly none of these theories are really very intuitive. For instance, it seems very counter-intuitive to me at least, that the amount of dark matter that you need is an exact straight line from an apparantly random point midway out from the centre of the galaxy.

I can't find my fake just now, but they look realistic too. It's just the printing on the outside that's a bit different.

Yes, I think what's what mine is too, although you have to watch out for fakes!!

This one.

Link or image? Maybe it's the one I got, I don't recall, we've just moved and it's all in boxes still.

Fantastic. How much did it cost?

Hi Andy, It's a great start, but I think it's upside down. Here's a site arguing which way up it should be: http://galaxymap.org/drupal/node/171 (NB EVen NASA got it the wrong way round ). Steve.

I'm pretty sure. What are the dimensions of the individual elements? I think the rules are, resolution is set by the largest dimension (ie the array), the sensitivity is set by the elements. If I'm wrong, Im suresomeone will correct me. Steve.

I'm using them as a stepping stone into spectroscopy. I've joined a group of six or eight like minded folks to try to track a group after rapidly varying Be stars for longer periods of time than we might otherwise do. I'm using a lowspec 3 and just putting the final touches to a star'ex. Kind regards, Steve.

No, it's even better. But it was @skybadger

Fantastic. This is the biz. Tx.

Hi Folks, Does anyone have a list of Be stars? Especially ones currently earlier in the night. Eg in Lyra. Kind regards Steve.

Your plots are improving. 86 cm is not too bad. I wanted a 3m dish too, but it was just too expensive. 😫 Even the MIT student dish is only 1.8 m. My 1.3 m dish was a fiver off ebay, which seemed like a deal. 1.22 x 21cm/86cm is about .3 Radians or 17 degrees. That's the resolution of your scan. You can see how @ZiHao has widened his antenna with struts and wire. You could do the same. Good luck, Steve.

I have an eq6 that works perfectly. I did change the handset once, I think with Malc here, but I also had problems from time to time with my eq5 and an eq3. All electronics go wrong from time to time, especially if they're left outside in an observatory. But the eq6 is the best mount I've ever had. I have no plans to change it. Steve.

Nice. The top left image has three peaks. A tall one and two short ones. Like this: Each peak is a separate arm of the Milky Way, so three arms. You can calculate the distance to each one. Here the writer has performed a gaussian fit on each peak to find the central point. As the Earth spins you can collect a plot, say, every 10 minutes and plot the curve for each spiral arm. Here's how to do it. https://physicsopenlab.org/2020/09/08/measurement-of-the-milky-way-rotation/ Good luck.

There are several resources: https://pictortelescope.com/ With a writeup here: https://www.rtl-sdr.com/pictor-an-open-source-low-cost-radio-telescope-based-on-rtl-sdr Managed by one of our members. rtl-sdr.com has lots of other references too. Eg jobs telescope (Google it). @Victor Boesen also has written some sdr code on github, which works quite nicely and I used his with a 1.3 m dish and sdr. From where we are you can map at least 1/4 of the Milky Way. If you have a clear horizon maybe more. Prepare to be stunned at what you can do 😀 Good luck, Steve.

Nice Victor. I didn't know you had gone on to do this. Good job.

Hi Astronomers, Does anyone know where I can find the spectroscopic data for galaxy rotation curves for M31, M81 and M109 (and maybe others). There are plenty of curves that can be cut and paste, but actually, I'd like to regenerate them. Like these: M81 M109 M31 But without all the other lines. I had hoped that places like Simbad might have them, but I can't really work out how to use it. Kind regards, Steve.

Yes, it hasn't been ideal, I might try that.

I'm just going to add to that, it needs the guide module to keep the star on the slit.

The Alpy is a nice spectrometer. I'd get that going first and then try others. The LowSpec I use is 1800 lpmm and your Alpy is 600. There's little point in switching unless you want finer resolution.

Just FYI. In the end I didn't print this myself. It was probably @SSI-Rick and he lent it to me.