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Wednesday, December 16, 2009

M31-The Andromeda Galaxy

Good evening everybody,
I have just finished my new picture. It`s a mosaic of M31.
I took 4 pictures of 4x20 minutes each for the outer nebulocity and 10x2 minutes for the core using a 200/1000mm newton telescope and a AllCCd6Pro camera.
Clear Skies Astroholgi

Tuesday, November 03, 2009

Barnard 303

Hallo fans of dark nebulae and emissions nebulae, the area around NGC 6559 and IC4685 show us some interesting objects:
  • Barnard 302 and 303 (my name is "the little snake"),
  • SH2-31 and 32, a planerary Nebula Min 1-41 and
  • some dark nebula (LDN ).
I took 4 pictures à 20 minutes with a Canon EOS 350 DA and a H-alpha Filter 13 nm from Astronomics. I used a 200/1000 Newton to capture this photo. For a larger version click here, please: http://www.astroholgi.de/data/storage/attachments/12570889944484.jpg

cls Holger

Tuesday, September 29, 2009

M27 planetary nebula in Cygnus

Hello friends,
this is my first picture with my new QHY8 Pro.
For the larger version look here:
http://www.astroholgi.de/data/storage/attachments/12543429722547.jpg

cls from Holger

Monday, July 13, 2009

Vixen GP/DX - A high quality telescope mount

This is one of the most popular telescope mounts ever produced. The high quality Vixen GP-DX is designed to carry over 10 kg of photographic equipment. It is really portable and it is designed to work for a lifetime. It is made in Japan.

Thursday, May 21, 2009

How to block the light pollution

This is the neodymium based 2" skyglow filter of Baader Planetarium. It's a good solution against the heavy light pollution of our suburban skies. I permanently use it for deep sky observations in Stuttgart(!) on my 21cm (f/11.5) DK cassegrain telescope with a 40mm eyepiece at a magnification of 60x (eye pupile 3.5mm). The Moon and Sky Glow Neodymium Filter does not affect the color of the stars. It also filters out the IR light. That's a useful piece of hardware.
Yesterday, I observed several deep sky objects in the galactic plane of the Milky Way using this filter:
  • M57 in Lyra: I clearly saw a ring of smoke. Really.
  • M56 in Lyra: a small globular cluster 30000 light years away.
  • NGC6871 in Cygnus: a small open cluster
  • NGC6888 in Cygnus: The cresent nebula. Yes, I saw its nebulosity.
  • M27 in Vulpecula: what a fantastic view! The sky background was black.
  • M71 in Sagitta Not as good as last year, because its altitude was too low.
  • NGC6905 in Dolphin: a small planetary nebula
  • M29: an open cluster in Cygnus
px

Saturday, May 02, 2009

Round up your stars

This is just a small photoshop trick, how to make round stars, although your sources show an oval form. After duplicating the 1st layer, you shall apply the photoshop filter "Abdunklen" i.e. "make darker.." and move the duplicated layer with the cursor keys. That's all!

See how it looks like..

Sunday, April 05, 2009

The Year Of Astronomy 2009


This is a photo of our "meeting" yesterday in Backnang/Germany. We counted about 100 visitors although the sky was cloudy. At the same time Edwald, Holger and Panagiotis gave a top-class speech about the star constellations and the celestial objets in the Max Born Gymnasium High school in Backnang. The big telescope is our 75 cm (f/4) reflector. Photo property of http://www.bksterngucker.de

Wednesday, March 04, 2009

The comet Lulin (videoclip)

Hi folks, ich have just uploaded a small video clip of Lulin on my server: http://de.astrodigital.net/animationen/animationen.html
This video clip is a short one. Anyway, it clearly shows the comet's motion in the firmament.

Sunday, March 01, 2009

Periodic error of a NJP JP-Z mount

Do you know PEMPro? You can measure the quality of the worm inside your mount with it. Although PEMPro offers much more functionality than worm measurement I will stay on that, since I measured the worm of a Takahashi JPZ mount with it.
Note: The peaks on the quasi sinus curve are due to bad local seeing conditions. The periodic error (PE) of this mount seems to be +2.8 to 3.5 arcseconds. Wow!

UNGUIDED
Example 1: This is the area around the Horse Head nebula in Orion (530mm focal length, color camera with 7.8mu pixels). The JPZ mount was totally unguided for 15 minutes!

Example 2: This is the area around the star Deneb in Cygnus at a resolution of 3.26 arcsec per pixel (560mm focal length, 9 mu pixels. The JPZ mount was totally unguided for 20 minutes!

GUIDED
Please find attached the guiding curve (in fact this is a guiding ... line!) of this Takahashi NJP JPZ. The mount was guided by a binned 2x2 Starlight Lodestar camera on a Takahashi FS-60C (f/5.9) scope with the software MaximDL

What does such a guiding line really mean at night under the stars? The following astrophoto has been taken at 530mm focal length with an unmodified Canon 7D camera.

Photo of the comet Lulin C/2007 N3

Thursday, February 26, 2009

Observing the comet Lulin

The partial cloudy night sky didn't prevent me to observe the new comet "C/2007 N3 Lulin" in the constellation of Leo tonight (20:35 GMT). I used my 21cm (f/11.5) DK-Cassegrain telescope at a magnification of 100x. I saw the comet as an oval black and white nebula. There was no hint of its poisonous ;-) green color and its small tail. Since the Earth is between the comet and the Sun at the moment the comet's faint tail is not so long as you could expect, unless you use a very sensitive 2x2/3x3 binned astrocamera on a fast scope. Lulin is at the moment 61 million kilometers far away from the earth. Its magnitude is 6.1 mag.

More stuff:
Two hour later, I observed the globular cluster M5 and I finally checked the polar alignment of my telescope mount using the software WCS. See the screenshot below:

Wednesday, February 04, 2009

Autoguider settings in CCDSoft (tm)

This is an autoguided 15 minutes exposure of M104's neighbourhood. Please, note the perfect round stars as a result of the autoguider parameters shown below. Correction: The exposure time of the autoguider was 10 seconds. The delay between the exposures was 30 seconds (3x times the autoguider exposure).

That's my autoguider settings during the integration of the galaxy M104. The results are quite promising but not perfect yet. They are coming soon.

Thursday, January 15, 2009

Periodic error of a mount

The periodic error of a mount (=>yellow arrow) has been measured here using the software PEMPro. The zacks are due to atmospheric turbulences (bad seeing). A Philips ToUCam at a focal length of 2415mm has been used for this test. The resolution of this configuration was 0,48 arcsec per pixel.


Let's have a look at the histogram. An asymmetrical histogram points at physical problems, but that's not the case here: