|
|
This type Sc spiral
galaxy in Ursa major was discovered by Pierre Méchain on March 27,
1781. M 101 lies at a distance of approximately 24 million light years with a magnitude listed 7.9. Although extended 22 arc minutes on photos and quite bright, only the central region of this galaxy is visible in smaller telescopes. On photographs, however, the Pinwheel Galaxy M101 is revealed as one of the most prominent Grand Design spirals in the sky. More informations are available in seds.org website |
|
|
| Optics |
130 mm f/5.0 Astro-Physics EDF Refractor with AP Telecompressor. TMB Triplet Apo 80 mm f/6 for guiding |
| Mount |
Astro-Physics AP 900GTO |
| Camera | SBIG ST-10XME. With a Remote Guiding Head |
| Filters | SBIG CFW9. Astrodon LRGB filters. Baader-Planetarium 7 nm Ha,SII,OII, filters |
| Focuser | Robofocus focuser and Focusmax software |
| Dates | February ,2009. |
| Location | Lentin Observatory |
| Exposure | L:210mn,bin1;R:160mn;G:160mn;B:200mn; bin2, -25°c. Scale= 2.14^s/pixel |
| Acquisition | All data's were acquired unattended with ACP Observatory Control Software V5 DC3 Dreams and MaxIm DL 5, including sky flats , |
| Processing | MaxIm DL 4, PixInsight 1, Photoshop CS2. |
|
Click here to look at my March 2005 previous attempt.
|
|
