Oct 07 monthly target - M31
Posted 04 October 2007 - 07:27 AM
You are encouraged to supply any or all of the following for observing/sketching the M31:
- tips on how to observe that object, filters or other equipment used
- media tried and tested for your renderings
- mini tutorial with an explanation and or/photos on how you did created the observation sketch
- link to any reports involved with the target, after all, these are observation sketches and links to reports will help all of us learn the object better as well as learn what to look for and how to optimize your viewing/sketching session
- or finally, just the sketch itself so we can all see each other's works in progress
Past monthly tutorial, tips, target threads
Posted 05 October 2007 - 01:41 AM
Here you can see my observation of The Great Galaxy from last fall:
Here is some details of the observation:
Location: Koivuluoto, Ulvila, Finland
Instrument: N 250/1200 mm (10''/F 5)
Field of view: 84,0'
Limiting magnitude: 5,7
Background sky: 2
Weather: Clear sky, moist air
Large and very bright galaxy, with bright and compact core. The outer parts of the galaxy were best with averted vision.
The dust lanes were also pretty well visible. The dim spots in the field are satellites of M 31, M 32 and M 110 in the bottom of the image.
Posted 10 October 2007 - 12:29 AM
A graphite observation (4H to HB) and then scanned and inverted in Photoshop.
Posted 10 October 2007 - 12:56 PM
I wanted to sketch a low power view of M31. Because this galaxy is a large object, a power of x16 to x20 would do the trick. Unfortunately my sky produces a lot of skyglow. The humidity in the air also added to the skyglow. I choose for the x20 eyepiece. A higher power does certainly counter the skyglow at the expense of field of view. I added the Baader Contrast booster filter, which darkens the background a bit without loosing too much starlight. I observed the galaxy for about 20 minutes without sketching. A large amount of details is only visible with averted vision. My eyes kept bouncing around the fov to produce a moving target. Wiggling the tube up and down also helped to detect fainter features in the galaxy. (While some people like steady tripods, I prefer a 'loose' one that I can shake ) Once familiar with the view, I started sketching. I used a clipboard with a sheet of printing paper (letter format). My fov-circle measured 18cm. I first plotted the stars with a pigment liner. Then I added the brightening of nebulosity with a mechanical pencil. And finaly I used the liner to mark darker portions in the galaxy. I used this raw sketch to produce a digital rendering using layers. I have included the four layers of the sketch in the picture below. Top left is the eyepiece template. Top right has the layer with the stars. Bottom left shows the nebulosity of the galaxy. And finaly Bottom right shows the core of the galaxy. I should note that the layers are a bit 'enhanced' to make them clearly visible in this mini tutorial. The sequence also demonstrates the way that the sketch is built up. First come the stars and then the nebulosity. The stars make the frame to position the galaxy and the core. The picture shows the separate layers. When I work on one layer, I keep the other layers visible as well.
The observation and final sketch can be found here.
Posted 10 October 2007 - 05:28 PM
An excellent observation of the Andromeda Galaxy. You have recorded the star-like core and dust lanes very nicely. M32 is clearly visible as well. Thank you for sharing it with us all.
Posted 12 October 2007 - 08:14 AM
Posted 12 October 2007 - 01:03 PM
An excellent observation of M31/32. You have captured their appearance very nicely. Thank you for sharing it with us all.
Posted 29 October 2007 - 05:09 PM
VERY nice sketches everyone!!!!!!
Posted 29 October 2007 - 06:17 PM
Posted 31 October 2007 - 04:19 PM
I observed these objects with my Dobson 8" and a 32mm eyepiece.
I made the sketch with an HB pencil on white paper and made an negative photograph of it.
Posted 01 November 2007 - 01:52 AM
Posted 04 November 2007 - 05:07 PM
Here's a wide-field sketch of M31 that I made the night of October 13 at Mount Tamalpais State Park, CA. It shows M31 along with M32 and M110. Seeing 4/10, Transparency 6/10.
The telescope was a William Optics Megrez 80 II FD refractor with a 32mm Erfle eyepiece (18x). The sketch was done with regular sketch pencils and a blending stump on Strathmore 400 series drawing paper. I scanned the sketch on a Macintosh and processed it using Pixelmator graphics software, following the techniques on Jeremy Perez's website.
Posted 05 November 2007 - 02:05 PM