The Official Astronomy Thread

@Albereth: Welcome, glad you decided to join in. Just be warned that we'll soon have you hooked and craving a scope!

The fun about amateur astronomy is that there's no complicated math involved - unless you want there to be. It's about getting out under the night sky and enjoying yourself.
 
I never disassemble mine. Mine's too heavy. I just grab it as is and take it out and start observing after a while. I never disassembled my 8" either.
 
Thanks - I'll do the binocular thing for a while and see how we go. I've been wanting to get a scope for a while but I also know that I'll need to have support for this hobby on the home front or it'll die a very rapid death.

What does help is that there is interest from one of the sprogs. She asked me for my text books which I dug out just before Christmas.
 
There was a club of sorts that met at Parktown Boys.

Does anyone have any info on when the observatory is open to the public? It used to be on a Friday night when there wasn't too much moon.
There is still a club that gets together, I'll get the details for you.

As to the other question, Depending on who you know and just how public :) There are meetings held by JHB-ASSA every second wednesday of the month at the observatory. Tomorrow is another meeting and there will be a talk @ 8:00pm by PROFESSOR DERCK SMITS on The First Generation Stars.

Afterwards if the weather is ok, then they will open up the dome to use the Innes Telescope (Which they have recently fixed) for viewing
 
There is still a club that gets together, I'll get the details for you.

As to the other question, Depending on who you know and just how public :) There are meetings held by JHB-ASSA every second wednesday of the month at the observatory. Tomorrow is another meeting and there will be a talk @ 8:00pm by PROFESSOR DERCK SMITS on The First Generation Stars.

Afterwards if the weather is ok, then they will open up the dome to use the Innes Telescope (Which they have recently fixed) for viewing

Yeah - saw that on their web site. I may go and pay a visit if I can convince the SO that it'll be fun.
 
I usually get "dragged" into the events because of Claire, But everytime I get there, I end up having a good time. The talks they have are very "intellectual" at times, and I have been lost half way through more than once, but if you like learning things its always great, especially since you always get to chat afterwards about whats going on.

The veiw through the Innes telescope is also just so incredible.. especially when you think about how old it is and what it can actually do
 
Wasn't National Geographic annoying last night? No sound for half the show on the Hubble telescope. I saw the guy explaining how all the colour gets added to the photos but with no sound I was left making stuff up in my own mind :(

The sound did come back for the bit about dark matter but I am afraid I was too distracted by other stuff to have paid as much attention as I ought to.

I also saw something on another website that said we weren't part of the Milky Way but are part of a Saggitarius Dwarf that is being canabalised (?). Anyone have more on this?
 
There are actually two small galaxies being canabalised by our galaxy ATM, but they are so small that our galaxy is literally just consuming it. In a few billion year's time, the Andromeda galaxy will collide with ours.
 
Albereth, have you got a link?

I think its hard to say though since we hardly know much about our own galaxy, to be honest. We know more about those around us that we can look at from our vantage point, but to know more about ourselfs.. we would have to look from the other direction.
 
Natgeo did mess up the sound. I was pretty disgusted since it looked like a very interesting documentary. Glad that I sat through it though and got to watch 'Mars Robots' which was very interesting. It showed what went into the Rover program and gave me new appreciation for the little guys. Great to see the bond that man and machine had.
 
Don't miss the partial solar eclipse between 07:00 and 09:00 today (Monday 26). Just don't look directly at the Sun without protection!
 
NASA Receives $1B From Stimulus Plan After Going $1B Over Budget

WASHINGTON — NASA can land a spacecraft on a peanut-shaped asteroid 150 million miles away, but it doesn't come close to hitting the budget target for building its spacecraft, according to congressional auditors. NASA's top officials know it and even joke about it.

This week auditors found that on nine projects alone NASA is nearly $1.1 billion over cost estimates that were set in the last couple of years.

Congress' financial watchdog, the Government Accountability Office, reviewed NASA's newest big-money projects and found most were either over budget, late or both. That doesn't include two of NASA's largest spending projects whose costs have wildly fluctuated and still aren't firm — replacements for the space shuttle fleet and Hubble Space Telescope.

Historically, overruns have caused NASA to run low on money, forcing it to shelve or delay other projects. Often, the agency just asks taxpayers for more money.

In fact, NASA got $1 billion from the new stimulus package. It's to be spent on climate-watching satellites and exploration among other things.

"Getting an extra infusion of money doesn't necessarily mean you have a capability to spend it well," said Cristina Chaplain, GAO's acquisitions chief who wrote the study.

A second GAO report used NASA as one of its leading poster children for bad practices in estimating costs. The space agency, which has a budget of about $18 billion, needs "a more disciplined approach" to its projects, the GAO said. NASA spending has been on GAO's "high risk" list since 1990. Its cost overrun problems will be the subject of a House Science Committee hearing Thursday.

"A cancer is overtaking our space agency: the routine acquiescence to immense cost increases in projects," NASA's former science chief Alan Stern wrote in an op-ed piece in the New York Times in 2008. He quit last year over the shifting of money to pay for cost overruns.

NASA's spending problems are so predictable and big that two years ago Congress put it under the same tough budgeting rules as the Defense Department. That means NASA must notify Congress if a program's cost rises by more than 15 percent. The GAO report issued Monday was the first using NASA's new requirements.

In a statement to The Associated Press, NASA said its missions "are one-of-a-kind and complex, which always makes estimating challenging... We do believe NASA is a good investment of federal funds and strive to provide the best value." The agency statement said external forces, such as launch availabilities, also cause delays and cost increases. The agency says it has improved its cost estimating.

Last December then-NASA administrator Michael Griffin tried to compare cost overruns — like the $400 million extra needed for the Mars Science Laboratory — with do-it-yourself projects that keep requiring extra trips to the hardware store. When a reporter quipped that his do-it-yourself projects use his own money, Griffin drew laughter with his response: "And we are spending your own money for this."

Imposing financial discipline, as GAO urges, "is an uphill fight," said Smithsonian Institution space scholar John Logsdon, who is on NASA's advisory council.

In the latest report, NASA couldn't provide the GAO with current accurate estimates on two of its hugest projects so the watchdog agency merely cited ballpark guesses:

• The program to build new spaceships to send astronauts back to the moon would cost somewhere around $37 to $49 billion and already has financial and technical risks, the GAO found.

• The multibillion-dollar James Webb Space Telescope, whose current cost is unknown, was at least $1 billion over estimates three years ago, before NASA began its new cost accounting methods.

NASA has cost overruns for several reasons, said the GAO's Chaplain. Those include poor cost estimating at the beginning, trying to do cutting-edge science, constantly changing designs, and poor contractor performance. Six of the projects had problems with contractors, including lack of experience, that led to delays or higher costs.

In his December news conference, Griffin said there isn't a very good way to estimate at the front end of a mission what it's going to take to achieve scientific priorities.

Griffin, whose replacement hasn't been named yet by President Barack Obama, said scientists tend to downplay costs early to convince NASA that their project is cheaper than someone else's. Later, once NASA commits and the money is being spent, more bucks are needed. So NASA spends more instead of canceling the project.

That's a problem everyone knows about and accepts, but shouldn't, Chaplain said.

The Mars Science Laboratory, which has ballooned to a $2.3 billion price tag, is a good example of NASA's approach. In 2003, its cost was put at $650 million on the National Academy of Sciences wish list, which NASA used to set priorities.

But on Tuesday, Doug McCuistion, who heads NASA's Mars exploration program, said the proper estimate to start with was $1.4 billion, not $650 million because it was not an official NASA projection.

By last December, the number was up to $1.9 billion. Then technical problems delayed launch plans from this year to 2011, adding another $400 million. The extra money came from cuts to other science projects.

"The costs of badly run NASA projects are paid for with cutbacks or delays in NASA projects that didn't go over budget," Stern wrote in his newspaper piece. "Hence the guilty are rewarded and the innocent are punished."

Link
 
New to this Thread

Hi,
Mercurial, Crusader, and Kalvaer should remember me from the the "object of the month" thread I just recently bought or have had a family member buy a Konus 90mm mak-cass on a EQ1 mount. Anyway I was out two nights ago in Durban showing my brother saturn and the fullish moon (not impressed, damn newage kids dont know something amazing when it hit them in the face) managed to mount the motor for tracking unto the mount only problem was that the counter weight when balanced collides with the motor and if you slide it out of the way the motor takes to much strain, so It seems to work very well when I take the counter weight off completely definatley less strain on the motor, tracks very nicely got some good views of the moon and of saturn and its two visible moons at 120x very crisp and clear image.

I now want to take a photo with my E0S film camera I have the t-mount fitting that I used on an old oriental lens just waiting for my extension ring to come, my question is how do I make sure that the tracking is perfect so that I can take longish exposure pic using the telescope as a lens(prime focus I think)

Also can see more of the orion nebula with my Binocs than with my scope it even disapears all together at one point?
 
my question is how do I make sure that the tracking is perfect so that I can take longish exposure pic
Just remember, Digital and film are very different in time, but the setup is basically the same.

For Firstly, you will have to sort out that weight. When doing long exposure, the telescope can and sometimes does, have to rotate around its axis. If that weight is causing problems, its going to mess up your image. With it off, you will find that it gets to a certain point were the balance is off and you will get movement on your image.

Next, you need to make sure that your scope is pretty much 100% polar aligned to the celestrial south pole. If its not, your tracking drive will not be able to follow stars no matter how good it is.

Once that is all done, its a bit of a wait. Centre the scope on a star or planet. let it run like that for about an hour or so to make sure that it is tracking nicely and remaining in the centre (Here an illuminated EP works great. It also helps to do the polar alignment if you have one by drift aligning your scope, but its not 100% critical)

What also helps is a guide scope. But that can get expensive again especially for somebody beginning

Then its take the shot and hope :) There are many other things to consider though, like focusing techniques, tracking drive PEC, etc, but the important parts are getting your alignment right first. Recommendations for film to use is Kodak and Fuji slide film, in the 100 to 400 ISO range. Really depending on what you can get in SA. I gave up adventually and imported my film
 
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Just remember, Digital and film are very different in time, but the setup is basically the same.

What do you mean they are different on time? do you mean exposure time?

For Firstly, you will have to sort out that weight. When doing long exposure, the telescope can and sometimes does, have to rotate around its axis. If that weight is causing problems, its going to mess up your image. With it off, you will find that it gets to a certain point were the balance is off and you will get movement on your image.
I assume that by adding more little weights I can have the main counterweight closer to the scope and therefore out of the motors way.

Next, you need to make sure that your scope is pretty much 100% polar aligned to the celestial south pole. If its not, your tracking drive will not be able to follow stars no matter how good it is..
I align the main axis toward geographic South(declination taken into account) then I set the same axis's inclination to the same as my current geographic latitude and that should technically give me perfect alignment? how would I check? I was thinking a small piece of paper with a hole in it just big enough for the object that I am viewing, so that I can see if it shifts.
Plus this specific telescopes tracking was said by one user not to track accurately longer than an hour.

(Here an illuminated EP works great. It also helps to do the polar alignment if you have one by drift aligning your scope, but its not 100% critical)
What is a illuminated eyepiece?
what is drift aligning?


Really depending on what you can get in SA. I gave up eventually and imported my film

I myself being into photography(antique's, Film only) found it nearly impossible to get good film unless I was willing to fork out for a box, but haven't even bothered trying in the last few years. I would only be able to use standard Cafe' film at first whilst testing cant I take multiple exposures and stack them after scanning? whats the shortest exposure I need to take for stacking purposes?

anyone know how to modify web cam for this type of imaging or maybe old B/W CCTV cameras?
 
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I did start making a telescope - spent many hours grinding glass but didn't get much further than that. I still have the two pieces somewhere but the mess involved in the process limited the activity. Women! LOL. Does anyone know if someone will 'finish' the process for me?

Are you looking for someone to finish the mirror FOR you or are you asking if someone is interested in taking the mirrors off of your hands?
What size mirror is it and how far did you get with it?
 
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