Archive for Jupiter

Jupiter through a 10 inch Mewlon telescope

Posted in Astrophotography with tags , , , , , , on 2013/02/09 by computerphysicslab
Tonight I’ve enjoyed observing a visual of Jupiter through a Mewlon 250. Although there was turbulence, it was worth. I had never seen a Jupiter so detailed by telescope. I could depict up to four bands, the great red spot and both polar icecaps. Inside bands I  could see small details as well. Also it has showed up Jupiter’s satellite Europa at its limbo during the observation.

I’ve got the best visual results without barlow, only using  a 15 mm (200x magnification) eyepiece. When using a barlow 2x, obtaining 400x magnification, details were not so easy to detect.

The telescope is a reflector Takahashi Dall-Kirkham at f/12, yielding 3 meters of focal.

I have also realized that when sit down in a chair and keeping the vision of the planet during several minutes trying different focus, the eye eventually adapts to the brightness of the planet and increasingly captures more details.

Here it is a picture of the setup:

Mewlon Setup

Sharing raw footage of Jupiter and Saturn

Posted in Astrophotography with tags , , , , , , , , , , , on 2011/02/11 by computerphysicslab

On 2011-02-06 I  took some videos of Jupiter and Saturn through a (4 inch) 102mm apochromatic refractor telescope. Applying Registax I got the results of the picture.

I’d like to share these two videos with anybody interested in playing with them:

Fringe color filter – Achromatic refractor

Posted in Astrophotography with tags , , , , , on 2010/12/12 by computerphysicslab
Chromatic aberration of a convex lense
Image via Wikipedia

Fringe color filters are able to cut almost completely the secondary spectrum on images taken through telescopes that yield chromatic aberrations, like an achromatic refractor.  Here is an example of the difference between an picture of Jupiter taken through a fringe color filter (left) and a similar picture taken without that filter (right).

Jupiter 2010 Opposition

Posted in Astrophotography with tags , , , , , on 2010/10/03 by computerphysicslab

Currently, Jupiter is at its minimum distance from Earth, which does not happen since 47 years. While the largest planet in the solar system can always be spotted with the naked eye, this time will look brighter.

The phenomenon is called opposition, and occurs when a planet is located exactly opposite to the Sun in the sky, meaning, the same side of Earth’s orbit about the sun. In such cases, the distance between the two planets is minimal. The oppositions between Earth and Jupiter occur every 13 months.

However, as the orbits of both planets are not perfectly round nor perfectly concentric, these approaches are not always the same. There is a “better” and a “worse” opposition. And the gap between the two planets varies from 591 to 676 millions of kilometers. Consequently, the brightness and apparent size of Jupiter also varies.

The current opposition of Jupiter is excellent, with the planet at nearly 592 million of kilometers from Earth. Equivalent to about 1,500 times the distance to the Moon, but Earth and Jupiter can not get much closer than that. The last time Jupiter was so close to Earth in October 1963 was 47 years ago. And it will not happen again until September 2022.

My Jupiters at ALPO

Posted in Astrophotography with tags , , , , , on 2010/09/28 by computerphysicslab

ALPO has a webpage where people around the world uses to post their best planetary images. Recently I got two pictures of picture through a Newtonian and through a refractor telescope. ALPO webpage published my pictures at these URLs:

And these are the images:

Manual Crazy Tracking

Posted in Astrophotography with tags , , , , , , , , , on 2009/09/01 by computerphysicslab

Lacking of an equatorial mount I have built myself a kind of manual tracking system that keeps into the field of view of a webcam a planet like Jupiter, for 3 minutes. This is long enough to record useful data and then post-process it with aggressive wavelets.

The resulting tracking is not at all perfect. You may see Jupiter swinging around the screen. It is important to capture the data at a fast shutter speed (1/100 sec.) to avoid motion blur in every frame because the planet is always dancing.

In spite of this movement, the results after stacking are very good. Here I show this really simple system and the resulting yesterday’s Jupiter with the webcam:




As you can see the Manual-Crazy-Tracking is a very simple system that consists in a rubber band attached to the tripod handle. If you try to track manually directly pushing the tripod handle, the shaking is excessive and you would need a very very fast shutter speed to get some useful data. The rubber band is necessary to reduce vibrations and increase the shift movement control.

At beginning Jupiter is located in the center of the field of view with no need to any corrections. As long as it drifts due to its sidereal movement you will have to pull using the rubber band in order to keep it in the center of the screen (it is supposed you have a laptop there capturing and showing images from the webcam). This way you may have Jupiter centered in the screen for a long time. You will have time to focus (left hand pulling the rubber band and right hand tweaking the focuser) and time to expose.

Jupiter, Io & Wesley impact scar

Posted in Astrophotography with tags , , , , , , , , , , , , , on 2009/08/28 by computerphysicslab

Good seeing yesterday too (2009-08-27 23h05m UT). Wesley impact scar is fading day after day, but it is still there. I made an animation that shows Io approaching Jupiter’s limb: