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Apr 1, 2008 1:42 pm
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Starrynights Policy Statement As a reminder of this group's desire to encourage all of its members to participate in a friendly and informed manner, please...
starrynights@yahoogro...
Apr 1, 2008 1:42 pm
30699
Yes, 109 is one of many victims of low surface brightness, most of it only visible in the galaxy's small core. Low SB fuzzies thrive on very dark and...
... M109 has a surface brightness of 13.5 magnitudes per square arcminute. The range for the Messier galaxies is 11.4 (M104) to 14.8 (M101). M109 is visible...
April 2008 Calendar by Dave Mitsky All times, unless otherwise noted, are UT (subtract four hours and, when appropriate, one calendar day for EDT) 4/2 Pluto is...
... This was really brought home to me a few weeks ago observing M83 from Australia. From my normal observing latitude, 45°N, this is almost always a very...
I'm having trouble attempting to fathom how astronomers can calculate the distance to stars, not that I doubt that they can do it for it is fairly obvious they...
All one ever sees from up here is the small ... and ... Thanks for the replies. It seems, if I understand them correctly that until I move am little further...
Hi my new friend. I'll try to answer your question without trying to get too technical. The first method for nearer stars is by magnitude comparison, sort of...
OK, I'm going to try to explain. Back me up if I get it wrong. Your correct to understand that stars are 'triangulated'. We DO NOT triangulate stars from...
Hi, Measuring distances beyond our solar system is very difficult and not all that accurate. There are many objects that we only have a vague idea of how far...
... <snip> ... Yes, I didn't realize there were two methods to determine the distance. Thanks for pointing that out. Is 10 parsecs the cutoff point, and if so,...
... You have already received several good answers but I thought I would add another method of finding stellar distances. Trigonometric parallax is the only...
Hi all, Another method used involves Cepheid variable stars. They can be used as "standard candles" because of the correlation between the period and ...
... used ... and ... derived. So, ... distance to ... against ... Ok, this is good info, now I gotta go do some homework to find out what "standard candles"...
... calculate ... is ... and ... is ... according ... earth is ... not ... so ... Hi there, bhm Jones. My name's Bill, and we're a friendly bunch, and would...
... Hi, To put it simply, a standard candle just means something of a known brightness. Apparent magnitude means how bright something appears to us - this...
... us ... much ... distance. ... I think I have read in the rules not to post a thank you to every response you get to a question, but I really am grateful to...
Hi my friend As you have read from other astronomers it has to do with star brightness, close stars distances are measured by what is known as "parallax". For...
... Thanks for your explanations Richard, it really has opened up an entirely new world for me to explore. I'm extremely intrigued by the spectrometry side of...
Hi all, tonight with a sky of 8 - 8 I called my wife out to take a look at NGC 3372 through our 4.5" short tube reflector using the 75x eye piece it came with....
Hi all, it was not a night of 'observing' but it was a night for checking messier objects off. There was high thin cloud which made detailed seeing impossible...
... It _is_ a Messier. It just isn't an interesting one, being a dim double star rather than a real deep sky object. ... You're in for a treat! Geoff -- Geoff...
