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About george7378

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    Proto Star
  • Birthday 23/01/94

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  1. Hi everyone, I have the position of a satellite in topocentric cartesian coordinates (i.e. the position of the satellite is given in [x,y,z] coordinates with the Earth-bound observer at the origin) and I want to convert this to and RA and Dec position as seen by the observer. I have seen formulae on this site: ...and the one for declination works fine, but the RA formula sometimes gives me a number larger than 360 (I'm working in degrees rather than hours) and even when I subtract 360 it isn't correct. This seems to happen about half the time, and I can't find any alternative formulae! Can anyone help? Thanks!
  2. Thanks a lot Actually Gary, this was my first try at a shot like this, and I guess I just got lucky! It was just a point and shoot job! summerstars - how did it go?
  3. The ISS is never dull - it's my favourite thing to watch!
  4. Since the ISS was going to be crossing the Moon in full illumination, I wanted to try and get a widefield shot. I think it worked! The station was visible the whole time as it flew across the crescent moon at full brightness. Taken with a Canon 1100D, 30 seconds @ ISO 400 and f/9.0
  5. I saw Panstarrs for the first time tonight! It was amazing next to M31, and I got some decent photos of it. The binocular view was great too, especially with the trees to frame the comet!
  6. It's not a Comet Panstarrs post, sorry! I took these tonight - some widefields of the western horizon, and a special visitor - an unexpectedly bright flare from Metop-A as it flies over to the north:
  7. The likelihood is that if two neutron stars collide, the degeneracy pressure supporting them will not be strong enough to overcome their gravitational collapse and they will explode as a type 1a supernova.
  8. Perfect definition!
  9. Absolutely perfect - is that faint halo of nebulosity surrounding the main galaxy actually part of M31?
  10. There's some lovely shadowing in there - reminds me of the view through large binoculars or my telescope with the 25mm eyepiece. I prefer the stacked image BTW!
  11. Beautiful! The layer on the bottom photo really lets me visualise the Sun in 3D. That's a lot of sunspot numbers
  12. The amateur Jupiter images are getting better all the time, congrats I love seeing how they evolve over the years I've spent on this forum!
  13. I've been wondering the same thing for years - every time I come round to thinking about buying I always manage to talk myself out of it (it just seems too expensive). I should probably look through one first though before I make judgement!
  14. Thanks I think this is my favourite type of astrophotography - seeing shots of the Milky Way over the Earth's terrain is always awesome!
  15. Here are a few photos I took with my 1100D yesterday - each one is pretty much unedited apart from curves and basic levels. Here's a description of each one: 1. A cloudy Orion with Jupiter framed against some trees with a plane on the bottom right (30 secs @ ISO800 f/3.5) 2. The Plough sitting above the trees looking through the clouds. (30 secs @ ISO800 f/3.5) 3. The 'HK-1C' rocket pulsing as it flies past M31 in the early evening. (30 secs @ ISO400 (I think) f/3.5) 4. Orion and Jupiter looking through the lit foreground trees. (30 secs @ ISO800 f/3.5) Thanks for looking, I'm really enjoying having the freedom to go out and be creative with widefields like this that a DSLR provides! I just wish I had a darker sky to really be able to crank up the ISO and take some nice clean shots!