Hi David. DSF> After an email from Harold Corwin who kindly pointed out an error, I’m DSF> no longer convinced of the equivalence between IC 4606 and NGC...
Steinicke-Streifenede...
Jul 1, 2004 7:00 am
12952
Hi Harold. David Frew wrote on amastro: DSF> After an email from Harold Corwin who kindly pointed out an error, I’m DSF> no longer convinced of the...
Steinicke-Streifenede...
Jul 1, 2004 7:00 am
12953
Hi Wolfgang et al., After further correspondence with Harold Corwin, I'm leaning back again (I'm feeling a bit like a pendulum at present) to the hypothesis...
Can splitting the double double (E Lyrae) get harder with an increase in aperture? I confirmed tonight that it is easy enough to do in a 108mm f/10 Newt at...
Beats me, but the Traveler splits the Double-Double at 87x on an average night and at 47x on a really steady night. Alan's old 60mm Unitron used to split...
I apologize in advance for posting this to the group. I wish to join the list via a second email address. Since the group is restricted and membership is only...
... That's an interesting question. I work every summer in the Public Observatory at Odyssium (Edmonton, Canada), where the Double Double is a *frequent*...
bmccurdy@...
Jul 2, 2004 1:48 am
12958
At 54x on the Newt, and probably in your refractor, my own astigmatism defeats whatever optics are in the telescope, so I can't say. But I have been in...
... list via a second email address. Since the group is restricted and membership is only by invitation only i can't just sign-up via the Yahoo website. The...
Greg N's original post doesn't specify, but it seems possible that the combined effects of seeing, optical characteristics (not just mirrors, but thermal...
Brian Skiff
brian.skiff@...
Jul 2, 2004 2:13 am
12961
Brian is right. Many accounts of poor seeing/poor optics/poor eyepieces are due to the problems inherent in the viewer's eyes. My own eyes, fully dark...
Just to make it clear(er), I hope: the point of understanding one's own vision is so you can separate out the effects in your eye from the one's a telescope....
Brian Skiff
brian.skiff@...
Jul 2, 2004 2:56 am
12963
Just to be clear, my observations were with a 4.25" f/10 Newt of what I think are very good to excellent optical characteristics; I hope some time to compare...
Greg, I have astigmatism, too. That's partly what the glasses are for. I can dump the glasses at when the exit pupil is under 3mm. Clear skies, Sue ... ...
P.S. With the glasses I can split the wide pair "naked-eye." (Without, I can see Vega - but it's a rayed mess.) Perhaps you should invest in some observing...
Unfortunately, Jeff Medkeff's plan to scan Barnard's Atlas (using a copy I had borrowed from a friend) and post the scans on the Web has come to nothing. The...
While working through a list of spectral types for double stars by Helmut Abt, I recognized this wide, bright color-contrast pair, variously known as ADS 5951...
Brian Skiff
brian.skiff@...
Jul 2, 2004 9:50 pm
12968
Could someone please provide me with (or point me to) a concise definition of core and half-mass radius wrt to globular clusters? Thanks! Christopher...
... These are values given in the Harris globular cluster compilation. Approximately, the "core radius" is where the surface brightness has fallen to half its...
Brian Skiff
brian.skiff@...
Jul 2, 2004 11:00 pm
12970
Thanks, Brian. Based on your description, it looks like I may have to re-visit these radii. -Christopher...
\Brian, h 3945 is an entry in the SAC Best 110 Best Double Star list. From an observation with the 8 inch (200mm) telescope I was it as yellowish-orange and...
AJ Crayon
acrayon@...
Jul 2, 2004 11:40 pm
12972
... I went through this exercise in the early 90s comparing against Chris Luginbuhl's and my observations that went into L&S, and new observations with the...
Brian Skiff
brian.skiff@...
Jul 2, 2004 11:50 pm
12973
... I didn't say so, but wasn't implying this was an overlooked pair--- it is (or should be) quite well known. \Brian...
Brian Skiff
brian.skiff@...
Jul 2, 2004 11:53 pm
12974
Brian; This stellar pair has been a Winter favorite of mine for many years, the colors are striking and easy in almost any scope I have ever owned. Here is an...
Here's my take on the identity of IC 4606. From the brief description given, the inference is that : 1) the object is rather small in apparent size,...
Mati Morel
morel@...
Jul 4, 2004 11:56 am
12976
Late the this thread but... Scanning might not be required if one has a high end digi-cam with a macro lens. Just put the book under a camera stand with a 6 to...
I listed the globulars with the highest central surface brightness from Harris' table (the central surface brightness mu_V (magnitudes per square arcsecond)...
There is a nice interface on line to Harris' catalogue. I did a search on various quantities in the catalogue, and it returns just the data you want in a ascii...
A little more than a year ago, I used the Harris data to create a formula to calculate the relative "visibility index" of the GCs I've observed. I attempted to...
Hi all! Browsing through the Deep Sky Browser I came across these clusters that I included in the database a few years ago. I'm not sure wether this is a well...
