At astroGC we use free software for post processing of images. The camera is setup to save a RAW format of each picture. This produces extremely large files as it just save all the infomation from the camera chip. But this format alows to retouch the color balance, exposure and hundreed of more parameters. We do this treatment with RAWTHERAPEE, a free program under GNU licence. Afterwards, a last retouch can be performed with GIMP, also free / GNU licenced program. Thanks to both companies for developing such powerful softwares.

Here are two night pictures taken in the nearby of Presa de Las Niñas (Gran Canaria) with exactly 24-hours interval. The sky can be completely different from on night to the other.

The moon rising on the peaks of Gran Canaria, 24 November 2018 at 8:15 pm

Spectacular starry sky before the moon rises. Gran Canaria, 25 November 2018 at 8:15 pm

Please help! I am looking for a name for this telescope.

It is big. Made in Gran Canaria by astroGC.

¡Ayudenme por favor! Estoy buscando un nombre para ese telescopio.

astroGC, 4 November 2018 at Roque Nublo

Screenshot of Aemet website, Spanish weather forecast agency

Unfortunately, it seems we are going to have another cloudy winter in the Canary islands. We had many difficulties to run the workshops during October due to Leslie Hurricane slowly crossing in the nearby. Once again the weather forecast predicts some difficulties for next week.

At astroGC we cancel the trips when the weather forecast is not convincing. This way we save our time and the time (and money) of our guests.

Nevertheless, the last few nights were good. The wind is blowing a bit disturbing the observation of planets but the sky is very clear (and moonless). This are excellent conditions for observing deep sky objects. Andromeda galaxy has been fantastic lastly.

When possible, we use our new handmade telescope in the trips. This is a perfect telescope for observing the deep sky. This picture has been taken yesterday night.

16'' telescope built at astroGC

16'' handmade telescope project

The 16'' handmade telescope project has been completed successfully. Yesterday night, it has been used for the first time in a conventional workshop at astroGC.

This time it worked perfectly. A highlight of the telescope is it's rigidity and precision. We checked the collimation right after mounting it in Cruz de San Antonio (Gran Canaria). The mirrors remained perfectly aligned despite of the route from Maspalomas. And they remained perfectly aligned while moving the telescope from zenith position to the horizon. This does not happen with this kind of telescope available on the market.

The rigidity of the structure, along with excellent quality of mirrors and focuser provided fantastic images of planets and deep sky objects. The Hercules globular cluster (M13) appeared very bright, clear and sharp. Most of our guests expressed a "Wow!" exclamation observing this massive cluster of stars.

For us this is the completion of a 2 years long project. We will try to use th…
Bennu is a 60 million tons asteroid orbiting around the sun in the nearby of the Earth orbit. It is a potentially hazardous object.

Size of Benny compared to Playa del Inglés.
OSIRIS-REx is a spacecraft launched in 2016 to analyze Bennu asteroid and return sample to Earth. Bennu may contain important information about the origin of life on Earth. Moreover, knowing the physical and chemical properties of Bennu may come in help in the future if we want to intend a mission to mitigate an impact with the Earth. 

OSIRIS-REx spacecraft
After about 2 years travelling, OSIRIS-REx recently took a first photography of the asteroid and began the final approach to it. This will be in December.

Photography of Bennu, by OSIRIS-REx

This picture has been taken yesterday, 29 September 2018 at Cruz de San Antonio. The bright planet on the left is Mars, Saturn is in the pine trees. Enjoy.


Camera: Nikon D5500Lens: Tokina SD 11-16 F2.8 (IF) DXII

Diaphragm: f/2.8ISO 640 (only)Zoom 11mm (wide angle)Exposure: 25s