Archive for 2008

My big black 8-incher

Posted by on January 23rd 2008 in Astrostuff, Shiny new kit

During the day, it hides in the wardrobe...

at night, it just wants to go out and have fun, see the sights, shoot the moon, that sort of thing...

I predict that we can look forward to a deep and meaningful relationship.

 

 

It's a Celestron Advanced C8-N, by the way. Here's the low-down:

General Details:

  • High quality 8" reflector
  • 9x50 finderscope with bi-directional alignment screws and a spring loaded pivot support
  • 2" focuser allows for use with 2" or 1.25" eyepieces
  • Slow motion controls for smooth tracking action
  • Heavy Duty (CG-5) German equatorial mount
  • Ultra sturdy 2" diameter steel tripod with accessory tray
  • Includes CD-ROM "The Sky" Astronomy Software which provides education about the sky and printable sky maps

Technical Information:

  • OPTICAL DESIGN: Reflector
  • APERTURE: 200 mm (7.87 in)
  • FOCAL LENGTH: 1000 mm (39.37 in)
  • FOCAL RATIO: 5
  • FINDERSCOPE: 9x50
  • MOUNT: CG-5 Equatorial
  • EYEPIECE 1: 20 mm (0.79 in)
  • MAGNIFICATION 1: 50 x
  • ACCESSORY TRAY: Yes
  • TRIPOD: 2 (two) inch Stainless Steel
  • CD ROM: The Sky Level 1
  • HIGHEST USEFUL MAGNIFICATION: 480 x
  • LIMITING STELLAR MAGNITUDE: 14
  • RESOLUTION: 0.69 arc seconds
  • RESOLVING POWER: 0.58 arc seconds
  • PHOTOGRAPHIC RESOLUTION: 400 line/mm
  • LIGHT GATHERING POWER: 843 x
  • ANGULAR FIELD OF VIEW: 1 °
  • LINEAR FIELD OF VIEW (@1000 YDS): 52.5 ft (16 m)
  • OPTICAL COATINGS: Aluminum
  • SECONDARY MIRROR OBSTRUCTION: 2.2 in (55.88 mm)
  • SECONDARY MIRROR OBSTRUCTION BY AREA: 8 %
  • SECONDARY MIRROR OBSTRUCTION BY DIAMETER: 27.5 %
  • OPTICAL TUBE LENGTH: 37 in (939.8 mm)
  • TOTAL WEIGHT: 67 lb (30.39 kg)
  • TELESCOPE WEIGHT: Approx 19 lb (9 kg)
  • COUNTERWEIGHTS: 2x11lb

Normally priced up at around £375, they're currently on sale at £249 (inc. VAT and delivery) at various places, I got mine from Rother Valley Optics.

Lunacy

Posted by on January 22nd 2008 in Astrostuff, Just for fun, Pics
Took a few shots with the D50 + 70-300 lens tonight, the skies were wild with fast-moving broken low cloud, impressively backlit by the full moon, which looks flat without shadows. First one: handheld stuff only, couldn't be bothered to race upstairs for the tripod. Full manual settings (300mm, f/5.6, 1/1250s, ISO 200), minimal tinkering with PS CS3.  

  Second one: mounted on the Velbon. Full manual settings (300mm, f/5.6, 1/1600s, ISO 200), minimal tinkering with PS CS3.  

  I'll take a few more next week, hopefully we'll see more depth and contrast as the shadows lengthen.

Wherezat?

Posted by on January 10th 2008 in Just for fun

 

or possibly

 

Fractal

Posted by on January 10th 2008 in Just for fun
 

 

Stupendous stuff!

Posted by on January 5th 2008 in Astrostuff, Thanks, Weather

Just to add insult to injury, the skies were clear and bright for long periods last night, acceptable for observing but, alas, my pass from SWMBO had expired.

Anyway, here's a big thanks to Stupendous Man for spreading the word about my interest in such matters.

Of course, there's no prize for guessing the true identity of Stupendous Man. Let's just say that it's not me.

Showers but no shower

Posted by on January 4th 2008 in Astrostuff, Weather

Well, the forecast was half-correct...

It was cloudy all night and it's still like that now, so the Quadrantid observing session was indeed scuppered as predicted.

Sadly, the predicted snow and low temperatures didn't happen, we got intermittent showers instead, so there'll be no walking in the white stuff this weekend. Looks like we'll have to go to the Snowdome instead.