Tag Archives: Aachen Observatory

Astronomy Day 2017

On Saturday, 25.03.2017 the 15. Astronomy Day will be held. An overview of activities can be found on the (german) Website of the Vereinigung der Sternenfreunde.

Of course, the Observatory in Aachen, (Sternwarte Aachen) opens it doors from 16h onwards. There will be activities for kids, as well as lectures and discussions for all ages. In addition, there will be a number of telescopes for observing the sun, stars or planets.

Food and drinks are available, entrance is of course free.

Some older images can be found on: http://www.fotowald.de/index-27.html

Transit of Mercury on 9. May 2016

In just over one weeks time, Mercury will pass in front of the Sun. Although Mercury only covers 0.004% of the surface of the Sun, this is a rare event and hence worthwhile to have a closer look at, although you should, of course, never “look” at the Sun directly without proper protection.

As only one of three bodies in the solar system (this is ignoring a vast number of tiny rocks and asteroids orbiting the sun in an orbit smaller than Earths orbit), Mercury is able to pass in front of the Sun. But while the Moon treats us with a (partial or total) solar eclipse, and Venus presents itself as a well visible black dot during a venus transit, Mercury is farthest away from the Earth and is hence fairly smal. Here is an image of the last  Transit of Mercury in 2003:

Merkur (oben links) vor der Sonne am 7. Mai 2003

Mercury (upper left) in front of the Sun on 7. May 2003.

The image was recorded using a 90mm maksutov telescope with 1250mm focal length on slide film.

Graphischer Verlauf des Merkurtransits.

Graphical illustration of the transit.

With a well protected telescope, one can see Mercury starting to nibble at the sun at 13:12h CEST for about three minutes, after which the whole of Mercury is visible in front of the sun. At 16:56h CEST Mercury is closest to the center of the Sun and heads again for the rim, which he will reach at 20:37h and after another three minutes, at 20:40h, Mercury will have left the disk of the Sun. At that time, the Sun almost sets in Aachen, but is still three degrees above the horizon. For exact times, CalSky is a very good tool to do the calculations.

Due to the tiny diameter of Mercury, the transit is not visible to the (well protected) naked eye. If you do not have the proper equipment to pbserve the transit yourself, there are many events in and around Germany where you can enjoy the transit under professional assistance. And of course, there will be an event at the Sternwarte Aachen.

If everything fails, there are some livestreams, e.g. at the Peterberg in the  Saarland or, possibly the safest option regarding weather, the NASA stream with images of the solar observatory SDO: http://mercurytransit.gsfc.nasa.gov.

Fingers crossed for perfect weather like in 2003, when the transit was perfectly visible here in Aachen.

EDIT: Here is another list with observations in the German area:

http://merkurtransit.de/merkurtransit-beobachtung.htm

and for the rest of the world:

http://www.cosmos.esa.int/web/bepicolombo-mercurytransit/locations

Announcement: International day of Astronomy – 5. April 2014

The Day of Astronomy on Saturday 5. of April is almost there. The Sternwarte Aachen, is, as every year so far, taking part and will have their doors opened from 15:00h until ‘open end’. A number of talks and experiments will complement the observation of the Sun, the Moon and other astronomical objects throughout the day. In addition to the 8″ main refractor, a number of amateur telescopes will be also available for observation.

Impressions of the Astronomy Day 2012 can be found here.

Tag der Astronomie 2012