Search found 135 matches

by mark.m
Wed Oct 18, 2017 9:48 pm
Forum: Galileo's Gabfest
Topic: Observing Challenge: Variable Star R Aquarii
Replies: 3
Views: 3207

Re: Observing Challenge: Variable Star R Aquarii

Paul: Yes! To quote from the AAVSO visual observing manual: "Another technique that is strongly recommended for making magnitude estimates of red stars is called the “out-of-focus method.” That is, the eyepiece must be drawn out of focus so far that the stars become visible as colorless disks. ...
by mark.m
Wed Oct 11, 2017 7:58 pm
Forum: Galileo's Gabfest
Topic: Observing Challenge: Variable Star R Aquarii
Replies: 3
Views: 3207

Observing Challenge: Variable Star R Aquarii

There's a pretty cool variable star that needs visual observations: R Aqr (Aquarius). This star is actually a binary pair, separated by about the distance between Saturn and our sun. The two stars started life with somewhat different masses. The more massive one (now called star "B"), reac...
by mark.m
Mon Feb 27, 2017 9:40 pm
Forum: Galileo's Gabfest
Topic: Pluto chapter III
Replies: 21
Views: 9400

Re: Pluto chapter III

..Pluto's odd orbit. I'm sure there are many theories of how this came to be. Can any of you mention some of them??? Jerry - Thanks for your comments. I'm finding this conversation kind of fun. (The one course in college that I received the lowest final grade on was Dynamical Astrophysics: the stud...
by mark.m
Sat Feb 25, 2017 1:00 pm
Forum: Galileo's Gabfest
Topic: Pluto chapter III
Replies: 21
Views: 9400

Re: Pluto chapter III

Wikipedia has some interesting information on the stability of the solar system, including Pluto and Neptune, which are currently locked in an orbital resonance that prevents collisions for some time into the future (10-20 million years). Beyond that, we can't predict. By the way, one of the things...
by mark.m
Mon Feb 06, 2017 8:38 pm
Forum: The Imager's Studio
Topic: NGC 253, the Sculptor Galaxy
Replies: 8
Views: 3569

Re: NGC 253, the Sculptor Galaxy

Beautiful, Andy.

As I look across your images, it looks like the diffraction spikes aren't always at the same angle relative to the CCD. Are you able to rotate the camera remotely? Or is that something that requires hands-on adjustment?

- Mark Munkacsy