Astronomy pictures thread

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NGC2264 (The Christmas Tree Cluster/Cone Nebula) last night.
NGC2264-2025-03-01-P1S.jpg
Camera: Canon Rebel T8i (modified)
Telescope: 92mm f/5.5 triplet (Astrotech AT92) with focal reducer
Exposure: 49x300sec (4hr 5min total) at ISO 400
Acquired using BackyardEOS, stacked using DeepSkyStacker, processed using PixInsight, BlurXterminator, NoiseXterminator and StarXterminator
 
Jingle Bells Jingle Bells Jingle all the way... I can't wait for spring.
 
Got the ALPY600 (slit spectroscope) mounted again and working well. Am contributing data to the AAVSO spectroscopy group. More information is know about the stars from Spectroscopy than any other means.

Here is the spectrum of star gamma UMa (Phecda). The dips in the chart are absorption lines corresponding the Hydrogen Balmer series. Care to learn a little about Quantum mechanics?
Screenshot 2025-03-09 104238.png
 
foolsgold said:
Got the ALPY600 (slit spectroscope) mounted again and working well. Am contributing data to the AAVSO spectroscopy group. More information is know about the stars from Spectroscopy than any other means.

Here is the spectrum of star gamma UMa (Phecda). The dips in the chart are absorption lines corresponding the Hydrogen Balmer series. Care to learn a little about Quantum mechanics?
View attachment 15875
Click to expand...

Very cool. Nice work!
 
And a couple more to confirm the calibration is good. If it's not AAVSO will kick them, but they look good to me. The first one is Betelgeuse an M1-type star and the second is Mahasim an A0V star. Both sent to AAVSO.

Screenshot 2025-03-10 013310.pngScreenshot 2025-03-10 011440.png
 
Okay this is the final physics lesson (for today). The visible light from the two stars above shows strength (higher X axis) and distribution (Y axis). This is a colorized visualization of how the spectroscope evaluates the light from distant stars. The shape of the curve (the continuum) demostrates why Betelgeuse appears orange and Mahasim appear white. Think of heated steel, the hotter Mahasim appear white, while the cooler Betelgeuse appears orange to the naked eye.
The x axis represents the entire visual spectrum.
Screenshot 2025-03-10 121551.pngScreenshot 2025-03-10 121620.png
 
Total lunar eclipse tonight/early Friday morning. Hope some of you have clear skies and can be up to take a look.

Will be fighting clouds and wind here but I am not going down without a fight and a lot of coffee since I find it damn hard to stay up late anymore.

Times in CDT, adjust for your time zone or better yet check a site like timeanddate.

Eclipse Stages Worldwide Local Time CDT
Penumbral Eclipse begins Mar 13 at 10:57:28 pm
Partial Eclipse begins Mar 14 at 12:09:40 am
Full Eclipse begins Mar 14 at 1:26:06 am
Maximum Eclipse Mar 14 at 1:58:43 am
Full Eclipse ends Mar 14 at 2:31:26 am
Partial Eclipse ends Mar 14 at 3:47:52 am
Penumbral Eclipse ends Mar 14 at 5:00:09 am
 
I can't wait to go through my data. Made it this far, well past max eclipse.
Might have to tear down in a hurry with cloud cover expected to increase along with precipitation potential.
Plan to keep it going as long as it seems practical.
 
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