spectro-aras.com

Maybe you find this interesting, as we are fond of OHP ...
T-193 (SOPHIE) at OHP, from the ground, has observed (radial velocities) the exoplanet kepler-16b (orbiting a binary star)
(https://arxiv.org/abs/2112.06584)

Hello, When I which to make observations for later processing with ISIS, what ADU should I aim at for my flats, and maximum signal of stars? Like IRIS, ISIS is clipping everything above 32K. Is ISIS working from -32K to +32K, or is it in the 0-32K range? Does it sound OK to pre-process data in SIRIL...

I autoguide using PHD2, which can oscilate like crazy when the slit that cuts a star image into two, and when the seeing is not that super. I think this clearly fits the problem mentioned! Up to now, I only know two alternatives (guide on a field star, or use a beam-splitter)... Maybe PHD2 will get ...

Very very impressive. with special emphasis on the pivoting fans used to "jitter" the "modal noise"... I got curious about this noise, about this solution, and about how much improvement such solution would bring... But I also admire the presence of solar, lunar and diurnal shift...

And this is my first spectrum of Saturn! C11 + Lhires III, 2400 l/mm, 15 um slit + KAF-403 I averaged the shifts of 6 lines, measuring between 1.3 and 1.4 Angstrom shifts. This suggests to a shift of 62.3 km/s (maybe I should have just measured the H-alpha line?) Since Saturn is very close to opposi...

Hi Robin, They are unguided, yes.. the star was drifting about 1 stellar diameter (3.6") per 3 or 4 images (~10 min).. But I did spend around 45 min drift-aligning the mount (not in an observatory yet). Having this light drift causes hotpixels to fall out of place in consecutive images, but the...

I have these two observations taken with SA100.. These are the two first spectra I ever took with SA100.. So I expect them to be wrong in some aspect... How "wrong" do they look? They represent SN2014j, subtracted by the just-above&below sky background that includes M82 spectrum. No at...

After what has been presented, I feel somewhat ashamed for this post, because it is a very noisy and bad spectrum.. But I tried to go after the tail, and it is difficult.. I also think the resolution I have of the light pollution is very low, so something was likely done wrong.. (collimator focus? T...

We are seeing it in the perspective of the Earth-living observer.. It could be interesting to have another eye out there in the Solar System.. But coming back to Earth, the idea of using a shorter focal length is a good one! But it appears we need even more field of view... If the Sodium is near the...

Thank you Robin and Olivier.. Perhaps I was worried about doing something wrong, or not having focused correctly because I thought the signal was very weak.. But if the Helix is faint, that explains it... I am not yet acquainted with the differences in exposure from normal take-a-pic to spectr-a-pic...