It begins to show some of Uwe's brightest details with 17.5" aperture.
4996
Type: Posts; User: yapo; Keyword(s):
It begins to show some of Uwe's brightest details with 17.5" aperture.
4996
Hi Uwe,
I tried it twice with 445mm aperture, medium to high powers (until 364x), UHC, OIII, NPB filters, to no avail. Maybe the below-average optical quality of the Coulter is the culprit (or...
I would bet on the reduced aperture because the transparency was good (1640m elevation and mag.6.8 star visible in UMi). One could add an extra (though minor) factor : too much power i.e. too small...
Great find ! This reminds me of the triple star NGC 2433 in Canis Minor, not clearly resolved in a 17.5" at 271x (digital sketch below) :
...
Funny, I tried the same target during last august to no avail with 17.5" at 83x. :)
Hi,
Here is what I observed in 2005 about that object in my 17.5" Coulter at 271x (I have NELM of 6.3 and transparent skies) : small, extremely faint (glimpsed less than 5% of the observing time...
Bertrand LAVILLE has suspected it once with a 25" Obsession (http://www.deepsky-drawings.com/abell-09/dsdlang/en) : the best combination was 519x without filter. BUT it needs to be confirmed as...
Hi Ivan,
Incidentally I was writing an article about Holmberg IX so the HII regions weren't too far from that.
I use NASA's NED for HII regions, or SIMBAD, as well as the ADS to get to the...
By the way (and as I can't find a better place on DSF where it should be posted), I recently found what could be the first "deep sky" mention in litterature, related to our particular field of...
I've got one, the red 17.5" model from about 1994... Poor optics also, that only allows for power up to 300-400x, but still my observing buddy for years (I wish I hade the money to have it...
A quite faint target indeed, Uwe ! Could you give us an estimate of the visual magnitude of each component ?
Hi Mark,
I followed the same observing path as you did, in 1992 but I think to remember that the Uranometria 2000 charts fouled me at the time and I later got it right (about which star group was...
Hi all,
my two cents on this issue : at present, 1631 targets (minus some planets and solar system objects, plus some new ones gathered during last summer sessions) from 1988 (rough descriptions)...
Hello all,
I am deepsky observing for quite a few years now and found this place to be THE place to talk and learn about it !
Hope to contribute as soon as possible and in the meantime, clear...