Recent Submissions: 2011 April 12-14

[owlice]

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Please post your images here.

Please see this thread before posting images; posting images demonstrates your
agreement with the possible uses for your image.

Thank you!
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[owlice]

NGC 3817
http://www.astrogrossi.de
Copyright: Torsten Grossmann
[attachment=4]NGC3817final..jpg[/attachment]

M81 in Ursa Major
http://www.astrosysteme.at/
Copyright: Wolfgang Gruenner and Josef Buechsenmeister
[attachment=3]m81_APOD.jpg[/attachment]

Ursa Major, Pollux, Caster, and Moonset over the Astronomical Observatory of Lisbon
http://www.astrosurf.com/astroarte/OALR ... ce-net.jpg
Copyright: Miguel Claro
[attachment=2]OALRightMoonSequence-net.jpg[/attachment]

Sundog over Ottawa, Ontario
Copyright: Klaus J. Gerken
[attachment=1]dscn6782.jpg[/attachment]

M83: Spiral Galaxy in Hydra
http://www.astro-austral.cl/imagenes/ga ... 3/info.htm
Copyright: José Joaquín Pérez

Click to view full size image

NGC 1097 in Fornax
Copyright: Andrey Oreshko
[attachment=0]1000.jpg[/attachment]

[owlice]

M81, M8 and IFN
http://jordigallego.fotografiaastronomi ... efield.jpg
Copyright: Jordi Gallego
[attachment=2]M81_M82_IFN_2011_800.jpg[/attachment]

Analemma and Analemma Calendar
http://pikespeakphoto.com/analemma.html
Copyright: Wojtek Rychlik
[attachment=1]analemma.jpg[/attachment]

Click to view full size image

Crescent Moon and Venus over San Diego
Copyright: Steven E Rubin
[attachment=0]sandiego11april_0003.jpg[/attachment]

NGC 2992
http://www.caelumobservatory.com/gallery/n2992.shtml
Copyright: Adam Block

Click to view full size image

[asymon]

B32
http://www.woodlandsobservatory.com
Alistair Symon

Click to view full size image

[owlice]

Yuri Gagarin
Sent in by: Yuri Petrunin
[attachment=1]Gagarin.jpg[/attachment]

Sagittarius/Scutum Mosaic
http://www.universethroughalens.com/Hob ... HQqg9-A-LB
Copyright: Sanjeev Sivarulrasa
[attachment=0]Sagittarius-Scutum Mosaic 135mm 9 Oct 2010 Sivarulrasa.jpg[/attachment]

[Ann]

Adam, I completely love your image of NGC 2992 and 2993! These are a pair of utterly fraternal twins! Colorwise, they could barely be more unlike. NGC 2993, as can be seen from your picture, is a massively starforming galaxy sparkling with blue and pink hues. NGC 2992, on the other hand, is a mostly yellow galaxy with no obvious emission nebulae. The color data for the two galaxies are appropriately different: B-V is 0.470 for NGC 2993, but it could be as low as 0.270. For NGC 2992, however, it is 0.960. That's a huge difference when it comes to galaxies. The U-B index is 0.400 for the red galaxy, NGC 2992, although it could be as low as 0.219. But that's nothing compared with NGC 2993, whose U-B is somewhere between -0.390 and -0.595! That's incredibly ultraviolet, and Adam, you make it show!

Interestingly, however, NGC 2992 is quite dusty, and its far infrared magnitude is a little more than two magnitudes brighter than its blue magnitude. This kind of relationship is common for starforming galaxies, although the dust that remains when a starburst has come to an end may produce a similar relationship between the blue and the far infrared magnitudes. Massively starforming NGC 2993 is almost two and a half magnitudes brighter in the far infrared than in blue light, and in this case it seems obvious that star formation has a lot to do with these colors.

Fascinating tidal formations are also visible in your image. NGC 2992 appears to have expelled so much gas in one direction that star formation is occuring at the end of this tidal tail. Maybe that is a dwarf galaxy in the making?

Like I said, this is a splendid image, Adam!

Ann

[dmkdmkdmk]

After a month (March) without any significant images from me, I finally took a nice shot yesterday:

Orion over Seenalper Seeli
http://www.kplan.ch
Copyright: David Kaplan

Click to view full size image

[T J]

With the significant light pollution in the centre of the UK, deep sky photography isn't always rewarding, but these recent images from my little home observatory were quite pleasing.

Thanks for looking.

Tim

Click to view full size image

Full size version here : http://www.btinternet.com/~mr.squeegee/ ... 3-2011.jpg

Click to view full size image

Full size version here : http://www.btinternet.com/~mr.squeegee/ ... -large.jpg

[owlice]

Cygnus Mosaic
http://www.universethroughalens.com/Hob ... HVCDm-A-LB
Copyright: Sanjeev Sivarulrasa
[attachment=4]Cygnus Mosaic 135mm 10 Sept 2010 Sivarulrasa.jpg[/attachment]

Saturn and the NED
http://saturn.cstoneind.com
Copyright: Christopher Go

[attachment=3]saturn20110409.jpg[/attachment]

[attachment=2]saturn20110411.jpg[/attachment]

Moonlit Trusk Lough, Ballybofey, Co. Donegal
http://www.DonegalSkies.com
Copyright: Brendan Alexander
[attachment=1]foreground_flat_blue.jpg[/attachment]

Sh2-199: Soul Nebula
http://www.istarion.net/
Copyright: Matts Sporre
[attachment=0]Sh2-199-The-Soul-Nebula-Hubble-submitted-no-frame.jpg[/attachment]

[owlice]

IC4603 and IC4604
Copyright: Olivier Garde
[attachment=4]GARDE.jpg[/attachment]

M101: Pinwheel Galaxy
http://www.starkeeper.it/M101RC.htm
Copyright: Leonardo Orazi
[attachment=3]orazi_M101.jpg[/attachment]

Peaches and Stars
Copyright: Tunç Tezel
[attachment=2]KumlukalanNorth.jpg[/attachment]

Caribbean Sunset and Moon
Copyright: Francis Audet
[attachment=1]Moon and Sunset in the Caribbean.jpg[/attachment]

Aurora and Whirligig
http://www.alaskascience.com
Copyright: Neal Brown
[attachment=0]Aurora.jpg[/attachment]

[pablo22]

M97 - Owl Nebula - PK 148+57.1 - false color narrow band
http://astrofotky.cz/~Konihlav
Copyright: Pavel Pech

[DaemonGPF]

[attachment=1]orion.jpg[/attachment]
http://1.bp.blogspot.com/-EEQ5oxxcECI/T ... rion+R.jpg

[attachment=0]orionm.jpg[/attachment]
http://4.bp.blogspot.com/-ssngxu0gXJA/T ... OrionM.jpg
Copyright Josh Knutson and Sal Grasso
http://daemongpf.blogspot.com
http://www.sgastrophotography.com/Sgastrophotography