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lainchan archive - /sci/ - 49



File: 1476249701117.png (1.72 MB, 300x169, Screenshot 2016-10-11 at 10.21.06 PM.png)

No.49

astronomy thread anyone?

  No.94

>>49
What kind of gear are you using?

For starters, I should create a dark frame for my camera to use for long exposures. Microcontroller/Arduino/RaspPi-based follower for telescope is also on the "Do someday"-list.

  No.121

>>94 i got a celestron nextstar
with a 114 mm mirror, to bad you cant see soykaf in my city

  No.126

>>49
I should probably get back into Astronomy soon. I know I've got a decent one laying around somewhere

  No.127

>>126
*a decent telescope

  No.131

>>126
what kind?

  No.136

sometimes when i get lucky, i can sneak into the 42 inch telescope in the observatory at my uni.

Its fun to stare at random sky things, and track the ISS when it flys by. I wish i could wave at the astronauts as they go by lol

  No.141

>>136
Now that is what I call academic freedom.

  No.145

File: 1476732560479.png (25.38 KB, 200x142, asdfg.jpg)

>>94
>dark frame

Wanna how to remove city glow from images...

1) Open your original sky image in GIMP.
2) Copy image to 2nd layer
3) Gaussian blur the 2nd layer alot (30pix?)
4) Change blend mode on top layer to subtract.
5) Profit?

  No.146

>>145
>Gonna revise step 3)
(try 6pix as a starting amount)

  No.148

>>145
Thank you! Though city glow has never been a problem, I don't live in that dense urban area. Dark frame is used to remove thermal noise, as it is subtracted from original image. What would be long enough exposure on different ISO values for such frames?

  No.149

>>136
that sounds pretty great

  No.150

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>>148
Good starting point for astro on a normal SLR or what not...
800-3200ISO
F as fast as possible - i.e. apature F2 / 2.8 / 4 depending on ya lens - adjust ISO acordingly.
Shutter speed try and keep to under 10sec on a 50mm equiv... 4 sec gives nice sharp results @50mm.
If you zoom more you need a faster shutter to freez the pannig of stars and details.

At 1200mm zoom the moon will move compleatly accross your screen in about 2min!

Moon shots use a similar exposure to earth daytime!
e.g. 100iso, 1/400th sec F5.6/whatever your lens sharpest apature is.

Do your dark frame with same settings and lens cap on... that way your subtracting the same amount of sensor heat build up noise and electronic amplifacation noise. (i.e. dont use an ISO 100 with 1/250th sec shutter speed for the dark frame to use on long exposure shots, as this will result in very diffrent noise structure in the dark frame.)

Not my pic related - i wish

  No.164

>>145
but does show new stars?

  No.173

>>164
no not as such, might make some stand out better if carfull but not bring up new ones - you would be best photo stacking for that.

Astro stack
http://www.astrostack.com/indexAS3LE.html
or similar (sorry don't know a foss alt currently and can't be assed to find one right now) would give results that equate to much higher res and ISO - reveling MOWA stars...

  No.187

>>164
what kinda camera do you need for this?

  No.188

>>187
This works for all cameras - but realisticly you will need a camera you can force a longer (4-16sec) shutter speeds with. And prefrably man focus, but not essential.

Better results, i.e. seeing more stars and less noise comes with better quality sensors used in DSLR type cameras. But most modern point and shoot cameras can deliver ok star pics if done right - but unlikly you will get anything like >>150 pic related - that needs a super bright lens and excelent signal to noise sensor.

  No.189

> tfw clouds every single night for weeks on end

shag this, moving to Atacama Desert

  No.194

>>188
i just wanna be able to see things here in san diego
(light pollution is a killer, i went to the desert a few weeks ago, the stars were amazing, when i came back it sucked to compare what i can see their to what i can see here

  No.195

>>189
could start a lain colony down there?

  No.246

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this is a great place to discuss about planet 9, i'm guessing.

with the data that's coming up around planet 9, the fact that there is a population of KBOs whose orbits have all become aligned really evokes something suspicious. they're not randomly scattered by some single event; their orbits have likely been gradually curated over time by the gravitational effects of some unseen object. They're also is a suggestion that planet 9 is a possible reason for the six degree tilt of the sun.

the object is not confirmed to meet IAU criteria for designation of planet. It's not a planet, yet.

  No.256

>>246
oh yeah i read about it when it was a headline, what happend, do you have details on how they searching for it?

  No.257

>>195
Dude, 45ºc and no water whatsoever is no joke.

  No.258


  No.259

>>257
>>195
> In winter (June, July and August) the average daytime temperature is 22°C (72°F) and by night 4°C (39°F)
This on the other hand sounds absolutely perfect.

>>194
Best stars I remember seeing were in Humboldt Co. in the summer. Not a cloud and no light pollution out in the woods. I don't smoke pot normally but I had "no choice" there. It was being given to me free and stargazing while high is beyond words.

  No.260

>>259
>This on the other hand sounds absolutely perfect.

Just a pro tip: deserts are never nice places to live.

  No.261

>>260
we could go The andes

  No.262

>>260
Neither is the yearly six months of rain, snow and slush where I live, with a summer that is over if you sleep in too late one morning. I'm not seriously thinking of moving but maybe a year in the desert would dry my lungs out for the first time in my life.

  No.263

>>262
if we found some neetland in between the mountains and desert

or we could have an astronomy lain colony in the pacific