Recent Submissions: 2012 November
Re: Recent Submissions: 2012 November
The Earth is Round...
Looking out of the window of commercial airliners I've always felt that the horizon was not entirely straight, in other words, that you could see the curvature of the surface of the earth. However, I was never sure if I was just imagining it. On a recent flight I snapped a photo with a wide-angle lens with a horizontal field of view of 90 degrees. Sure enough, the horizon came out curved. (The lens was rectilinear, not a fish-eye).
If you think about it, the curvature of the horizon isn't all that surprising. Looking at the world from an altitude of 11km (36,000 feet) above sea level your horizon is about 375km away, and the distance between two points at the horizon that are 90 degrees apart from your point of view (left and right edge of the photo) is 530km. The direction that is "up" at those two points differs by about 4.8 degrees. A difference of almost five degrees in the direction of the horizon should be clearly visible.
Curvature of the Earth by fksr. Click on the image for a larger version.
I also shot an anaglyph 3D version of this photo, where can also see the surface of the earth curve away from you in the distance:
Curvature of the Earth in 3D by fksr. Click on the image for a larger version.
Looking out of the window of commercial airliners I've always felt that the horizon was not entirely straight, in other words, that you could see the curvature of the surface of the earth. However, I was never sure if I was just imagining it. On a recent flight I snapped a photo with a wide-angle lens with a horizontal field of view of 90 degrees. Sure enough, the horizon came out curved. (The lens was rectilinear, not a fish-eye).
If you think about it, the curvature of the horizon isn't all that surprising. Looking at the world from an altitude of 11km (36,000 feet) above sea level your horizon is about 375km away, and the distance between two points at the horizon that are 90 degrees apart from your point of view (left and right edge of the photo) is 530km. The direction that is "up" at those two points differs by about 4.8 degrees. A difference of almost five degrees in the direction of the horizon should be clearly visible.
Curvature of the Earth by fksr. Click on the image for a larger version.
I also shot an anaglyph 3D version of this photo, where can also see the surface of the earth curve away from you in the distance:
Curvature of the Earth in 3D by fksr. Click on the image for a larger version.
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- Science Officer
- Posts: 135
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- Location: Perth, Western Australia
M42 with 60Da
Photo taken with Canon 60Da, CPC925 ...
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- Asternaut
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Re: Recent Submissions: 2012 November
Pleiades and surrounding nebulas
Hi-res here:
http://www.tamanti.it/Stars%20Cluster/M45_5D.htm
Thanks for looking, best regards.
Copyright: Andrea Tamanti
Hi-res here:
http://www.tamanti.it/Stars%20Cluster/M45_5D.htm
Thanks for looking, best regards.
Copyright: Andrea Tamanti
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- Science Officer
- Posts: 195
- Joined: Sun Aug 29, 2010 10:29 am
Re: Recent Submissions: 2012 November
NGC 6188 in ARA and the Bipolar NGC 6164-5 - Hydrogen Alpha image only.
16" F3.75 Dream scope from Tivoli farm in Namibia.
Kfir Simon
larger version:
http://www.pbase.com/tango33/image/147234594
16" F3.75 Dream scope from Tivoli farm in Namibia.
Kfir Simon
larger version:
http://www.pbase.com/tango33/image/147234594
Re: Recent Submissions: 2012 November
Another Messier 33 (ngc598)
Ha+LRGB , imaged from Àger Observatories (Catalonia). I hope you like it!
larger version here:
http://observatoriagullo.wordpress.com/ ... 33-ngc598/
Ha+LRGB , imaged from Àger Observatories (Catalonia). I hope you like it!
larger version here:
http://observatoriagullo.wordpress.com/ ... 33-ngc598/
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- Ensign
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Re: Recent Submissions: 2012 November
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- Location: Mount Shasta, CA
Re: Recent Submissions: 2012 November
Aurora over Central Oregon
http://goldpaintphotography.com/
Copyright: Brad Goldpaint
Time-lapse video can be found here: http://wp.me/p1FtJT-qL
http://goldpaintphotography.com/
Copyright: Brad Goldpaint
Time-lapse video can be found here: http://wp.me/p1FtJT-qL
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- Ensign
- Posts: 40
- Joined: Sat Jan 07, 2012 12:44 am
Re: Recent Submissions: 2012 November
NGC 457 in Cassiopea: a rich galactic cluster also known as "E.T. Cluster" or "The Owl Cluster"
Authors: F.Antonucci - M.Angelini - F. Tagliani
ADARA Astrobrallo - http://www.astrobrallo.com
Full-Size Image: http://www.astrobrallo.com/gallery/var/ ... 1352562119
Details: http://www.astrobrallo.com/gallery/inde ... ster-finle
Authors: F.Antonucci - M.Angelini - F. Tagliani
ADARA Astrobrallo - http://www.astrobrallo.com
Full-Size Image: http://www.astrobrallo.com/gallery/var/ ... 1352562119
Details: http://www.astrobrallo.com/gallery/inde ... ster-finle
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- Ensign
- Posts: 56
- Joined: Tue Feb 07, 2012 12:58 pm
Re: Recent Submissions: 2012 November
M103 (NGC 581), Open Cluster in Cassiopeia
http://www.elateobservatory.com
Copyright: Velimir Popov
Large scale and more information is avaliable here ...
Thank you for looking ...
http://www.elateobservatory.com
Copyright: Velimir Popov
Large scale and more information is avaliable here ...
Thank you for looking ...
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- Location: New Zealand
Re: Recent Submissions: 2012 November
NGC 1365 and Supernova SN2012fr
http://www.rolfolsenastrophotography.com
Copyright: Rolf Wahl Olsen Link to full resolution image (1.7MB)
This image shows the large elegant barred spiral galaxy NGC 1365, located in the southern constellation of Fornax at a distance of 56 million light years. The bright and intensely blue star directly below the galaxy core is supernova SN2012fr, which was discovered by Alain Klotz (TAROT La Silla telescope) on 27th October 2012.
As of 10th November 2012 the supernova appeared to be nearing its peak, with an R magnitude of 11.90. To get an idea of how bright this event is we can calculate the absolute magnitude M of the supernova using the following formula where m is the apparent magnitude and D the distance in parsecs: M = m - 5(log10(D) - 1)
This gives an absolute magnitude of -19.27 for SN2012fr. This means that if the supernova had occurred at a distance to us similar to Betelgeuse (643 light years), then its apparent magnitude would be -12.80, same as the full Moon!
Image details:
Date: 7th and 9th November 2012
Exposure: LRGB: 205:57:56:51m, total 6hrs 9mins @ -30C
Telescope: 10" Serrurier Truss Newtonian f/5
Camera: QSI 683wsg with Lodestar guider
Filters: Astrodon LRGB E-Series Gen 2
http://www.rolfolsenastrophotography.com
Copyright: Rolf Wahl Olsen Link to full resolution image (1.7MB)
This image shows the large elegant barred spiral galaxy NGC 1365, located in the southern constellation of Fornax at a distance of 56 million light years. The bright and intensely blue star directly below the galaxy core is supernova SN2012fr, which was discovered by Alain Klotz (TAROT La Silla telescope) on 27th October 2012.
As of 10th November 2012 the supernova appeared to be nearing its peak, with an R magnitude of 11.90. To get an idea of how bright this event is we can calculate the absolute magnitude M of the supernova using the following formula where m is the apparent magnitude and D the distance in parsecs: M = m - 5(log10(D) - 1)
This gives an absolute magnitude of -19.27 for SN2012fr. This means that if the supernova had occurred at a distance to us similar to Betelgeuse (643 light years), then its apparent magnitude would be -12.80, same as the full Moon!
Image details:
Date: 7th and 9th November 2012
Exposure: LRGB: 205:57:56:51m, total 6hrs 9mins @ -30C
Telescope: 10" Serrurier Truss Newtonian f/5
Camera: QSI 683wsg with Lodestar guider
Filters: Astrodon LRGB E-Series Gen 2
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- Ensign
- Posts: 97
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Re: Recent Submissions: 2012 November
Rosette Nebula in Hubble Palette
Copyright: Terry Hancock
http://www.flickr.com/photos/terryhanco ... hotostream
Using narrow band filters H-Alpha, OIII and SII Processed using the HST (Hubble) Palette with SII assigned to red channel, H-Alpha to green channel and OIII to blue channel. 4x30 min each, total exposure 6 hours
The Heart of The Rosette (crop)
Copyright: Terry Hancock
http://www.flickr.com/photos/terryhanco ... hotostream
Using narrow band filters H-Alpha, OIII and SII Processed using the HST (Hubble) Palette with SII assigned to red channel, H-Alpha to green channel and OIII to blue channel. 4x30 min each, total exposure 6 hours
The Heart of The Rosette (crop)
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Re: Recent Submissions: 2012 November
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Re: Recent Submissions: 2012 November
Last edited by mikiclinic on Mon Nov 12, 2012 2:54 am, edited 4 times in total.
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Re: Recent Submissions: 2012 November
IC342 The Hidden Galaxy in Camelopardalis
Acquisition: Paolo Lazzarini
Processing: Davide Bardini
Newton WFN 350 f/4.3 - Paramount ME - STL11000
Osservatorio astronomico della Val Malenco (SO) Italy
http://www.cieloinvalmalenco.it
http://www.astrosky.it
Medium: http://www.astrosky.it/index.php?id=358
Large: http://www.astrosky.it/imagebig.php?big=358
Thanks for viewing!
Acquisition: Paolo Lazzarini
Processing: Davide Bardini
Newton WFN 350 f/4.3 - Paramount ME - STL11000
Osservatorio astronomico della Val Malenco (SO) Italy
http://www.cieloinvalmalenco.it
http://www.astrosky.it
Medium: http://www.astrosky.it/index.php?id=358
Large: http://www.astrosky.it/imagebig.php?big=358
Thanks for viewing!
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Re: Recent Submissions: 2012 November
Dawn of the Milky Way
http://500px.com/rafaeldefavari
Copyright: Rafael Defavari
Click to view full size image
http://500px.com/photo/17433101
The warm glow actually it is not a rising sun, but the light pollution of a big city nearby: Campinas, Brazil.
http://500px.com/rafaeldefavari
Copyright: Rafael Defavari
Click to view full size image
http://500px.com/photo/17433101
The warm glow actually it is not a rising sun, but the light pollution of a big city nearby: Campinas, Brazil.
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- Ensign
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Re: Recent Submissions: 2012 November
NGC 884 & NGC 869: The Double Cluster in Perseo (H & Chi Persei)
Authors: F. Antonucci - M. Angelini - F. Tagliani
ADARA Astrobrallo: http://www.astrobrallo.com
Full-Size: http://www.astrobrallo.com/gallery/var/ ... 1352684011
Picture details: http://www.astrobrallo.com/gallery/inde ... o-Finale-1
Authors: F. Antonucci - M. Angelini - F. Tagliani
ADARA Astrobrallo: http://www.astrobrallo.com
Full-Size: http://www.astrobrallo.com/gallery/var/ ... 1352684011
Picture details: http://www.astrobrallo.com/gallery/inde ... o-Finale-1
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- Asternaut
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Found Images: 2012 November
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Re: Recent Submissions: 2012 November
The Chariot of Auriga
http://www.lightwavesobservatory.com/Li ... n=download
Copyright : James Black
http://www.lightwavesobservatory.com/Li ... n=download
Copyright : James Black
Last edited by LightWavesObserver on Mon Nov 12, 2012 9:57 am, edited 1 time in total.
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Re: Recent Submissions: 2012 November
Cederbald 214 7nm hydrogen alpha
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
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Re: Recent Submissions: 2012 November
NGC7822 and Cederbald 214 widefield 7nm hydrogen alpha
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
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Re: Recent Submissions: 2012 November
The Heart and Soul Nebula widefield 7nm hydrogen alpha
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
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Re: Recent Submissions: 2012 November
The California Nebula 7nm hydrogen alpha
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
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Re: Recent Submissions: 2012 November
The Elephant Trunk Nebula 7nm hydrogen alpha
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
http://www.lightwavesobservatory.com/Li ... n=download
copyright : James Black
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Re: Recent Submissions: 2012 November
Rosette Nebula in CFHT Palette
Copyright: Terry Hancock
http://www.flickr.com/photos/terryhanco ... hotostream
Using narrow band filters H-Alpha, OIII and SII this was processed with the CFHT Palette technique, the channels are assigned with H-Alpha = Red, OIII = Green, SII = Blue. Captured over 2 nights on the 22nd October and 7th November 2012 from my backyard observatory in Fremont.
The Heart Of The Rosette (crop)
Copyright: Terry Hancock
http://www.flickr.com/photos/terryhanco ... hotostream
Using narrow band filters H-Alpha, OIII and SII this was processed with the CFHT Palette technique, the channels are assigned with H-Alpha = Red, OIII = Green, SII = Blue. Captured over 2 nights on the 22nd October and 7th November 2012 from my backyard observatory in Fremont.
The Heart Of The Rosette (crop)
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Re: Recent Submissions: 2012 November
Small Magellanic Cloud
http://500px.com/rafaeldefavari
Copyright: Rafael Defavari
Click to view full size image
Also on http://500px.com/photo/18033241
http://500px.com/rafaeldefavari
Copyright: Rafael Defavari
Click to view full size image
Also on http://500px.com/photo/18033241