This weekend weather in London was quite amazing: sunny, a bit too windy, but sky almost perfect. Seeing forecast was also encouraging, so on Friday evening I took a chance to shoot at Jupiter.
It was a bit of an unlucky evening: firstly I discovered that I forgot my red dot finder on, so the battery was totally drained. After struggling for a while trying to align my GoTo mount without it, I decided it was worth to leave the telescope alone for a few minutes (my garden is easly visible from the street... I didn't want to do it unless absolutely necessary) and got back inside to find new batteries.
After everything was aligned, and I was ready to observe and record my images, I noticed that the image wasn't exactly satisfying at the eyepiece. When I replaced the eyepiece with the camera, the very unfocused image revealed me why: some tree branches were in the way, and of course the image was deteriorated from the interference!
I looked around me to see if I could find a better spot to place my scope, but with no luck. I decided to try anyway, taking multiple shots, so maybe in some of them I might get an almost clear picture.
This is the best result I could get:
Of course, the difference with my previous shots taken with a bigger 200mm SC is pretty visible, but I think with better conditions this new telescope can do much more.
Since I made four sets of images, spanning a bit more than 40 minutes, I was also able to an animation showing Jupiter rotation:
- Celestron Nexstar SLT 127 Maksutov
- ZWO ASI 178mm with LRGB filters
- Software: my Planetary Imager for shooting, Autostakkert!2, Registax, Siril and GIMP for image processing.
Luminance channel: 4500 frames, best 20% used. R/G/B channels: 1000 frames, best 40% used.
Mars is getting really close to 2016 opposition, the best in the last 10 years, since it’s very close to earth.
Weather in Milan wasn’t great these days, so me and Alessia tried to catch the first night offering a clear sky and a possibly good seeing.
We were pretty much lucky: seeing wasn’t the top, with mars being very low on the horizon, but it was good enough to get a proper look: we were able to distinguish a few major features, particularly when it began to rise a little bit over 20°.
I also took a few pictures, this is the best result, shown here with a Stellarium simulation for that day and hour.
We observed also Saturn, getting close to its own opposition too, although even lower in the horizon than Mars, and Jupiter, still quite high and bright in the sky.
At the eyepiece, it was impressive: the great read spot was particularly evident, and a satellite (we later identified it being Europa) was getting closer and closer to the planet disk.
When I started shooting with my camera it was already over Jupiter, and it’s visible as the bright spot in the left part of the planet.
Although the images are not as good as I was hoping, it was a very nice evening, we could finally have a good couple of hours doing astronomy, and it was a relief after a long time being unable to observe due to bad weather.
Spring is back, and here in Milan we finally had a few days (and nights) of very nice weather.
I also bought a new lightweight battery for my HEQ5 mount, instead of the usual heavy car battery I’ve been using until now, so I took a minimal setup and placed myself in a local park.
Seeing wasn’t perfect, but it was fine enough to shoot a few nice details of an almost full moon.
More importantly, Jupiter was at opposition a few weeks ago, so it’s still in a very favourable position.
Another couple of high resolution images, taken on the Appennines, with quite a lucky seeing.
Jupiter is now rising earlier, and it was a welcome preview to the observing night.
Firstly I tried shooting on prime focus, using small magnification, and then I used a 2.5 barlow lens. The prime focus shooting should have been just a test, but it proved to be the better one, as I had troubles focusing with the barlow lens (we were already in “night” mode, and I had to darken a lot my monitor, so focusing was really difficult).
Since we already finished observing I could remove my notebook darkening panel, and focus quite better with the 2.5x barlow.
It was also a very satisfying deep sky stargazing night (which was actually the main purpouse of our trip to the Appennines).
Spring constellations enable us to go really “deep”, with very far and suggestive galaxy clusters.
Another shooting, much improved in quality compared to the previous ones: Jupiter bands are very well defined, rich of details, much more compared to the images of fifteen days ago: probably both because of the better seeing, and of the removal of the IR-pass filter, replaced with a more classical IR-Block, gathering much more light.
The “guest” of the title is the dark dot almost at the center of the planet: it’s not an image artifact, but it’s the shadow of the Io satellite projected on the planet. Basically, a solar eclipse on Jupiter.
The satellite itself is not visible on the picture, submerged in the planet disk. The other two satellites are, from closest to farthest, Europa e Ganimede.
Notice: this article is currently available in italian only.
I will translate it soon. You may contact me via comments if you want me to “prioritize” this article first.
Per una serie di vicissitudini (e per il maltempo che l’ha fatta da padrone) non ho potuto osservare molto Giove, in opposizione proprio nei prossimi giorni, e quindi nel periodo di migliore osservabilità.
Ieri sera comunque sono riuscito ad effettuare qualche osservazione e qualche ripresa, approfittando di un seeing stranamente non cattivo come solitamente da casa mia: purtroppo non ho balconi o terrazzi, e mi tocca riprendere ed osservare dalla finestra aperta, cosa che alza di parecchio la turbolenza per il continuo passaggio d’aria tra interno ed esterno.
In visuale era piuttosto evidente la Grande Macchia Rossa, che nelle riprese invece sembra quasi invisibile. Non è infatti il globulo scuro che si vede nella banda in alto a sinistra. Questo perchè la ripresa è stata effettuata nel vicino infrarosso e non nel visuale, per ridurre l’interferenza atmosferica, quindi i dettagli visibili nella ripresa sono un po’ diversi da quelli che si vedono ad occhio nudo.
Si vedono molto bene anche due dei satelliti galileiani, Io ed Europa.
Ripresa effettuata al fuoco diretto di un Meade ACF 8″, 2000mm di focale, con filtro IR “Planet IR Pro 807“, camera QHY5II-L. Sommati circa 800 frames (di 2000 totali).
Giusto una manciata di giorni dopo ho potuto ripetere il tentativo, con una messa a fuoco un po’ più fortunata.
Non è visibile la macchia rossa, in questo caso, ma sono riuscito a tenere nel campo tutti e quattro i satelliti galileiani.