Thursday, January 30, 2014

Supernova SN2014L in Messier 99 (Virgo)

SN2014L is a supernova in the galaxy M99
During the image acquisition, the CCD camera was working at -42,3°C. That means amazing 45°C under the ambient temperature, a value which far exceeds the specification of this camera. The dark noise of the QHY8L was almost not noticable at this temperature. Hence, I did not use any dark frames to calibrate the sub-exposures.
QHY8L was working at -42,3°C during imaging
Wide field photo of M99 and its supernova. Note the M100 galaxy at the left side

The Markarian's Chain in Virgo

The Markarian's Chain
Markarian's Chain is a stretch of galaxies that forms part of the Virgo Cluster. It is called a chain because, when viewed from Earth, the galaxies lie along a smoothly curved line. [Source: Wikipedia,'s_Chain]
The photo above is available in high quality at:
QHY8L, RGB=7x900s, f/5.4, FL=714mm, TOA130, JPZ, FS60C, Lodestar, PHD

Saturday, January 11, 2014

A telescope software for the legendary HP-12c

Here is a port of my telescope, eyepiece and CCD software for the legendary "HP-12C Platinum" calculator. You may find it useful for astrophotographic and visual work since it computes some important properties of your telescope system for a given eyepiece and camera combination.

Image: The HP-12C calculator next to an astronomical eyepiece
You type:
  • Telescope aperture
  • Focal length
  • Eyepiece focal length
  • Eyepiece field of view
  • Pixel size of the CCD camera
  • Light frequency
You get calculated:
  • Surface of this aperture
  • Focal ratio
  • Magnification
  • Exit pupil
  • Field of view of the telescope (FOV)
  • Maximum resolution of the telescope
  • CCD resolution
  • Light power of the telescope