ISS above Amsterdam

March 7, 2010 20:13 by scibuff

Here’s my first shot of the International Space Station (ISS) passing over Amsterdam (taken at 19:00 UTC on March 07, 2010). The station passed right through the constellation Orion only a fraction of a degree north of the Orion’s belt.

ISS Above Amsterdam

ISS Above Amsterdam crossing the constellation of Orion - (4 subframes exp. 10s f/5.6 ISO 1600 each, stacked with RegiStax)

The ISS will be visible in Amsterdam until March 20 and the next visibility window will start on April 10. Below is the list of the “best” passes over the city:

Date Mag. Start * End *
8 Mar -1.9 18:52:50 18:57:43
8 Mar -3.1 20:27:20 20:29:57
9 Mar -2.8 19:17:15 19:22:35
9 Mar -1.8 20:52:15 20:54:05
10 Mar -3.3 19:42:01 19:46:38
10 Mar -0.6 21:17:11 21:18:08
11 Mar -3.4 20:06:53 20:10:38
11 Mar 0.2 21:42:06 21:42:08
11 Mar -3.4 20:06:53 20:10:38
11 Mar 0.2 21:42:06 21:42:08
12 Mar -3.2 18:56:35 19:02:21
12 Mar -3.3 20:31:44 20:34:35
13 Mar -3.3 19:21:23 19:27:01
13 Mar -1.7 20:56:37 20:58:31
14 Mar -3.2 19:46:11 19:50:56
14 Mar -0.5 21:21:38 21:22:26
15 Mar -2.4 20:11:00 20:14:51
16 Mar -3.0 19:00:31 19:06:16
16 Mar -1.3 20:35:59 20:38:46
17 Mar -2.2 19:25:16 19:30:44
17 Mar -0.3 21:02:20 21:02:44
18 Mar -1.1 19:50:13 19:54:43
20 Mar -0.9 19:04:20 19:08:45

* all times are in CET (UTC+1) and represent the moment when the station’s elevation is 10°.

Source: Heavens-Above.com

For more information about (visible) passes of ISS, and satellites, not only in Amsterdam but for any place on Earth, visit the heavens above website. You can also follow @twisst on twitter.

Waxing Crescent Moon Tonight

February 16, 2010 19:15 by scibuff

Here’s a photo of waxing crescent Moon taken tonight at 19:00 GMT from Amsterdam. Only 2 days and 17 hours old, not many features are visible on the surface. The two prominent craters visible at the bottom just at the terminator are Langrenus (right) and Petavius (left).

waxing crescent Moon tonight

Photo of waxing crescent Moon taken tonight through a refractor ATC Monar (D=70mm f/4.6) with Canon 450D, exp. 1/50s

Galactic Cirrus between M81 and M82

February 15, 2010 11:56 by scibuff

The image below portraits two galaxies known as M81 (NGC 3031 or Bode’s Galaxy) and M82 (NGC 3034 or the Cigar Galaxy). M81 is one of the most striking examples of a grand design spiral galaxy, with near perfect arms spiraling into the very center. M82 is five times as bright as the whole Milky Way and one hundred times as bright as our galaxy’s center. Tidal forces caused by gravity have deformed this galaxy, a process that started about 100 million years ago. The interaction between the galaxies has caused star formation in M82 to increase 10 fold compared to “normal” galaxies.

M81 and M82

170 minute black and white image of M81 and M82 - Credit: Lightbuckets.com

The inverted image (below) reveals much more that meets the eye. The wispy tendrils seen in the inverted and stretched image are known as Galactic Cirrus. They are high galactic latitude nebulae that are illuminated not by a single star (as most nebula in the plane of the Galaxy are) but by the energy from the integrated flux of all the stars in the Milky Way.  These nebulae clouds, an important component of the Interstellar Medium, are composed of dust particles, hydrogen and carbon monoxide and other elements.

Inverted image of M81 and M82 showing the Galactic Cirrus between the galaxies

Inverted image of M81 and M82 showing the Galactic Cirrus between the galaxies - Credit: Lightbuckets.com

Galactic Cirrus was first found in plates in the Palomar Sky Survey in the mid 1960’s. Alan Sandage investigated them further in 1975 while working with the Palomar 1.2m Schmidt Telescope. The surface brightness of these structures is about 25 mag. or even fainter, which makes them extremely hard to capture with most amateur equipment.

The galaxy group, consisting of M81, M82, NGC 3077 and NGC 2976, is the nearest galaxy group to our own local group (which contains the Milky Way, Magellanic Clouds, M33, and the M31 – M32 – M110 system). At 12 million light years distance, the nearby proximity of galaxies M81 and M82 makes them one of the most spectacular sights in the spring sky.

- The images used in this post have been taken by Alvin Jeng during a test run of the Lightbuckets’ LB0002 – a 0.2m Newtonian Astrograph.

Starry Sky Tonight

January 26, 2010 21:34 by scibuff

It was a very cold day in Amsterdam today but along with it came virtually cloudless sky, so I had the chance to continue taking photos of the Moon as it approaches the Full Moon (06:18 GMT on January 30) as well as the perigee (09:04 GMT on January 30, 2010) when the it will be 356,592 km away from the Earth – the closest this year.

Waxing Gibbous Moon

Waxing Gibbous Moon taken tonight through a refractor ATC Monar (D=70mm f/4.6) with Canon 450D, exp. 1/50s

(Compare the Moon with photos from January 25 and January 20)

My next target was the open cluster Pleiades (M45). The effects of close proximity with the Moon tonight is visible on the left side of the photo.

Open star cluster Pleiades (M45)

Open star cluster Pleiades (M45) through Canon 450D ISO 1600 f/8 exp. 10s

Finally, I turned the camera towards the constellation of Orion and one of the most scrutinized and photographed objects in the night sky – The Orion Nebula (M42).

The Orion Nebula (M42)

The Orion Nebula (M42) through Canon 450D ISO 1600 f/8 exp. 10s

Waxing Gibbous Moon Tonight

January 25, 2010 20:45 by scibuff

Here’s a photo of waxing gibbous Moon taken tonight at 19:20 GMT from Amsterdam.

At the terminator near the top, the edge Sinus Iridum (“Bay of Rainbows”), the plain of basaltic lava that forms a northwestern extension to the Mare Imbrium, is clearly visible. To the south of Mare Imbrium is a prominent lunar impact crater named after the astronomer Nicolaus Copernicus. Just past the terminator on the night side near the south pole is the Cabeus crater where the Lunar CRater Observation and Sensing Satellite (LCROSS) ended its mission impacting the lunar surface on October 9, 2009.

Waxing Gibbous Moon Tonight

Photo of waxing gibbous Moon taken tonight through a refractor ATC Monar (D=70mm f/4.6) with Canon 450D, exp. 1/50s

The position of Cabeus Crater on Lunar sufrace

The position of the Cabeus crater with respect to Lunar maria (Click to embiggen) - Source: Virtual Moon Atlas

Waxing Crescent Moon Tonight

January 20, 2010 20:14 by scibuff

Originally, I planned to continue my ISS above London series although now it would be renamed to ISS above Amsterdam. Unfortunately, I missed tonight’s fly over between 17:41:57 and 17:48:47 GMT when the ISS passed only a few degrees south of the Moon.

Fortunately, freezing out on the roof terrace wasn’t a complete waste of time as I managed to take the following shot of the crescent Moon [click to embiggen].

Waxing Crescent Moon tonight

Photo of waxing crescent Moon taken tonight through a refractor ATC Monar (D=70mm f/4.6) with Canon 450D, exp. 1/50s

In the photo above, 25% of the surface is illuminated. At the time, the Moon was at the distance of 400,438 km only a few hours after reaching the apogee (January 20, 2010 at 14:55 GMT). Chromatic aberration, caused by the failure of the primary lens to focus all colors to the same point due to different refractive index for different wavelengths of light, is noticeable on the edges (green in the bottom left, red in bottom right, and blue in top right) but quite obvious in the original (uncropped) image [~2mb] with the resolution of 4272px x 2848px.

As there is no need for colors in lunar images, I was quite happy to “correct” the chromatic aberration by setting the image [click to embiggen] to gray-scale:

Waxing Crescent Moon (Grayscale)

Grayscale photo of waxing crescent Moon taken tonight (eq and exp. details same as above)