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mrjaffa

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About mrjaffa

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    Nebula

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    UK
  1. Missed these replies guys. I was checking the thread in my 'subscribed' section on my iPad and nothing new was showing up. So only just saw these :-( If there are a few of us from the Teesside area, we should try meet up sometime. I know I'd always be grateful of any help with my set up as I've had it well it over a year and only ever took it out once. And I never really fancy taking it out by myself :-)
  2. Hey bud. Just saw this and your PM. I've actually just got myself the Monday off work so I can stay up for this. Was probably going to view from my garden but did maybe think of venturing out. So thanks for the invite! I may well do so. Think I would need a postcode or something as I've no idea where it is though ;-)
  3. Sounds ideal. See if you can get a postcode for me. I could try it myself ;-)
  4. I wanted to go to Wynyard for one of the meetings last year but never did. I may this time round. I emailed a few of them actually asking for advice on where to go. One of them from Durham was even kind enough to invite me to his place where he has dark skies and his own little observatory. I never did though :-/ I'm sure when I was up Clay Bank the other week, as I was leaving someone was in fact setting up their scope. But it was too dark to tell. I really wanted to stop and ask, but could have been awkward if they weren't lol. I've had mine for well over a year and apart from a failed attempt one night in the freezing cold at Wynyard, I've barely used it. Now is probably a perfect time. Dark enough before midnight and not too cold! :-)
  5. Thanks for that! I actually had about 180 credits from years ago when I went to uni and studied IT (but didn't finish) and they've allowed me to transfer those. So I currently have about 200 credits :-)
  6. I completed S282 in June. And am taking Planetary Science (S283?) in October. When you say you did the 'full degree', do you just mean enough points to get a 'OU degree'? I didn't think these modules were part of a specific degree and did wonder once you had enough points for the degree, what you would say your degree was in. For example, people have maths, physics degrees etc. But with these you can pick random modules right so wouldn't have a specific degree.
  7. I've just subscribed to this. Wasn't sure whether to. Took a few days of pondering so glad to read some positive comments here.
  8. Hey bud. Only just saw your post. I drove up Clay Bank the other night just to check it out and it seems pretty good. I didn't take my scope, was just out and about and thought I'd check it out. It's weird how creepy it is though. Not sure I'd want to go by myself lol. You found anywhere reasonable?
  9. Thanks for this guys. I didn't see the obvious. I've done this now and all the numbers look pretty good. Thanks!
  10. Hey guys. I'm trying to answer a few questions around radial velocity and Hubble constant for my studying. I know the rules around doing people's homework, so I'm just looking to be pointed in the right direction. I have data for a Galaxy edge on. Hydrogen balmer line from two stars, one at each end of the Galaxy. So you would expect one to be moving towards us and one away, but both wavelengths have been stretched slightly, but I'm assuming this is because the Galaxy itself is moving away from us. I've worked out their velocities but I am then asked to work out the galaxies recession velocity. This is where I'm stuck. I only have the wavelengths of light emitted from the stars, not the Galaxy itself. So how can I do this? I haven't read anywhere in my text book that I can take the middle value of two stretched wavelengths, in effect cancelling out the rotation of the Galaxy and giving me a value I can use to then calculate the galaxies velocity. But this is the only way I can think of doing it. Anyone have any ideas? Thanks!
  11. Hey Martin, just wanted to say thanks for your help. I don't even think I know how to type that into the calculator to get mtotal. Guess I'm in a little over my head. This is what I ended up with, but no idea if I'm right. (m1 – m2) = - 2.5 log (b1/b2) The ratio of b1 / b2 = 92/8 as we know S2 is only 8% of the combined magnitude = 11.5 So, (m1 – m2) = -2.5 log (11.5) = -2.65 We can then go further and calculate the apparent magnitude of S1 as we know its absolute magnitude to be 4.85 and its distance to be 12.82 pc. m1 = M + 5 log (d/10pc) So, m1 = 4.85 + 5 log (12.82/10pc) = 5.39 magnitude So we now know both apparent magnitudes and can prove 8.01 is in fact correct for S2 if it contributes only 8% to the combined magnitude of 5.25. (m1 – m2) = -2.5 log (b1/b2) So, 5.39 – m2 = -2.65 In other words, 5.39 = -2.65 + m2 m2 = 5.39 + 2.65 = 8.04 magnitude which is close enough to our value of 8.01
  12. My reply didn't seem to post..... I'm very grateful for this, but I'm soooooo lost. I've actually done something completely different with help frm someone else. Here's what I have.... Using Fig 1, the magnitude of S1 and S2 combined is approximately 5.3. So the difference in magnitudes of S1 and S2 is: (m1 – m2) = - 2.5 log (b1/b2) So, 5.3 – m2 = -2.5 log (100/8) = 2.74 magnitude 8.01 magnitude – 2.74 magnitude = 5.27 magnitude
  13. Hey guys. I'm struggling with a question I need practice with. Spent ages on this now and even asked for help from a friend with a first degree in maths and we're still not too sure. Hopefully someone might be able to help.. Here we go. Two stars in a binary system. S1 and S2. Combined light totals abvout 5.3 apparent magnitude. S2, the smaller star has a magnitude of 8.01 and contributes 8% to the combined magnitude. Using (m1 - m2) = -2.5 log (b1/b2), prove that the apparent magnitude of S2 is in fact 8.01.... Any ideas? Thanks a bunch!
  14. Hey guys. I got some great help in a previous post around a question I was struggling with for my first assignment. Now I'm struggling with another for my second assignment. The question asks, what 2 pieces of observational evidence could be used to determine whether a interstellar cloud would fragment into many protostars rather than one large protostar. I've re read the few chapters for fragmentation and can't find the answer. All I could seem to find was if the cloud is big enough it could fragment to produce many protostars. But nowhere does it say it needs to be so big or dense so the answer can't be its radius and density. Any ideas? Thanks!
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