Recent Submissions: 2011 June 28-July 1

owlice · Post by **owlice** » Fri Feb 04, 2011 4:56 am

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mexhunter · Post by **mexhunter** » Wed Jun 29, 2011 12:58 am

The Sun of today (6-28-11).
Copyright: César Cantú
The Coronal Hole in the band Ha at 0.5A°it is appraised.

: Click to view full size image

Also in website: http://www.astrophoto.com.mx/picture.ph ... category/6

owlice · Post by **owlice** » Wed Jun 29, 2011 11:32 am

NGC 4236: Barred Spiral Galaxy in Draco
http://kerschhuber.astronomie.at/galeri ... 6_a12.html
Copyright: Günter Kerschhuber
[attachment=5]20110402-ngc4236.jpg[/attachment]

Twilight Blue Dipper
Copyright: Dario Giannobile
[attachment=4]ursa maior at sunset.jpg[/attachment]

Fire Dipper
Copyright: Andy Johnson
[attachment=3]FireDipper2_72.jpg[/attachment]

SkyCenter Domes at Night
http://www.caelumobservatory.com/galler ... omes.shtml
Copyright: Adam Block
[attachment=2]sky domes at night.jpg[/attachment]

Circinus Galaxy
http://astro-cabinet.com/showimage.php? ... ng=english
Copyright: Dieter Willasch
[attachment=1]CircinusGalaxy_DW.jpg[/attachment]

A cosmic firewheel blown by the wind
Copyright: Andreas Mayer et al/University of Vienna & Université libre de Bruxelles

[attachment=0]Mira_Herschel_2011.jpg[/attachment]

The star o Ceti was named Mira, the wonderful, by Johannes Hevelius in 1662 who was stunned by the appearance and disappearance of the star on the night sky. Meanwhile the star became a well-studied object due to its distance of only 300 light-years and today a whole class of late-type stars with long periodic light variations are named after Mira. The star was observed in many wavelengths and revealed different interesting features. In the present picture, two previous images that were both Astronomy Picture Of The Day (2007-08-17 and 2006-07-22) and a new observation are combined. On the left, a GALEX observation in the ultra-violet by Martin et al. (2007) shows an extended 13 light-years long tail structure of Mira flying through the interstellar medium and on the right an X-ray observation with Chandra reveals Mira's binary nature (Karovska 2006). Late-type stars undergo massive mass loss in form of dusty winds which are visible in the infrared. New observations at far-infrared wavelengths with the PACS instrument on board the Herschel Space Observatory reveal arc-like structures in the expelled matter of Mira. They are interpreted as resulting from the perturbation of Mira's wind by the binary companion, combined with the 110 km/s motion of Mira through the interstellar medium. ~ Andreas Mayer

Efrain Morales · Post by **Efrain Morales** » Wed Jun 29, 2011 5:13 pm

Asteroid 2011MD was approaching and less then 15 hrs from close approach or a distance of 0.37750 LD from my observation point here in Puerto Rico. The Saharra dust and a Tropical storm closing made it more challenging to track but managed to take these images. A blink animation can be seen also.

: Click to view full size image

: Click to view full size image

Efrain Morales · Post by **Efrain Morales** » Wed Jun 29, 2011 5:18 pm

The Nano Sail was passing over the island and possibly its last fly over this week and luckily captured it due to its rapid decaying orbit it was a challenge to captured it due to its unpredictable course. Some flash burst is seen from its angle deflecting the sun light. Animation was made with 40 frames. ( Nano Sail exspected to re-enter in approaximately 3 weeks from now )

: Click to view full size image

: Click to view full size image

owlice · Post by **owlice** » Thu Jun 30, 2011 3:44 am

Sh2-119 and the North America Nebula
http://www.flickr.com/photos/geza_kurcz ... otostream/
Copyright: Géza Kurczveil
[attachment=1]nanebula.jpg[/attachment]

Night Dome
http://www.deidrawilson.com/wp-content/ ... vatory.jpg
Copyright: Deidra Wilson
[attachment=0]Dome.jpg[/attachment]

jldauvergne · Post by **jldauvergne** » Thu Jun 30, 2011 8:02 am

Total Lunar Eclipse in Tajikistan
http://astrophotography.fr/
Copyright: JL Dauvergne / Valère Leroy / Sophie Huet

http://vimeo.com/25788938

Click to play embedded YouTube video.

I'm just back from Tajikistan since few days, after two weeks in the Pamir mountains.
This part of central Asia was realy the perfect place for the eclipse.
So I've made a special time lapse with a motor-driven system to follow the Moon for more than 5 hours.
With the naked eye the sight was realy great beaucause the wind stoped during the total part, so the lake was a perfect miror for the Moon and the Milky Way.

Emil Ivanov · Post by **Emil Ivanov** » Thu Jun 30, 2011 12:08 pm

M 8 (The Lagoon Nebula)
http://www.emilivanov.com/
Copyright: Emil Ivanov

: Click to view full size image

Bigger size and image details

Ann · Post by **Ann** » Thu Jun 30, 2011 6:35 pm

Emil Ivanov, that's a lovely Lagoon!

I've seen those blue borders above and below the Lagoon Nebula in carefully done photographs before, so I know they are real. The blue light from the hot stars reach farther than the ultraviolet photons that ionize the hydrogen gas of the nebula. Or rather, when the concentration of ultraviolet photons drop below a certain theshold, there is no or only little ionization of hydrogen.

Géza Kurczveil, thank you for calling attention to Sh2-119. This nebula is ionized by neglected O star 68 Cygni, a massive runaway star.

Ann

blackhaz · Post by **blackhaz** » Thu Jun 30, 2011 7:38 pm

Abell 61 - Planetary Nebula in Cygnus
http://www.bcsatellite.net/bao/Abell61/abell61.html
Copyright: Maxim Usatov

: Click to view full size image

Abell 61 is an old, evolved planetary nebula, about the size of the M97 - The Owl, although much fainter. It is measured 3.4' in diameter - about 4 light years across, and is located 4,566 light years away from us in a beautiful star field of Cygnus. To me it looks like to be one the most photogenic PN I have imaged so far. In the narrowband [O III] line, its surface brightness increases steadily from ESE to WNW, and it shows a brighter rim in the WNW. Vast majority of Abell 61 is chemically all [O III], although observations from various sources indicate some [Ha] and/or [N II] lines are present.

This nebula is rarely imaged. Perhaps, the best image of Abell 61 I have seen so far was from the 60cm Hypergraph from the Capella Observatory at Crete, Greece. Abell 61 has low surface brightness, thus demanded 45 minute exposures for a total of 6 hours through the 3nm narrowband [O III] filter in order to reach barely acceptable signal level with my 25cm telescope. Abell 61 is about 22,000 years old and is currently at it's late stage of expansion. It's material, weighing at 0.55 Solar masses and 88,200 deg K hot, is expanding with a velocity of about 30 km/s. A 17 magnitude variable star NSV 11917 is shining at its center, and many stars and some tiny anonymous galaxies are visible through the round oxygen glow.

One distinctive feature of Abell 61 that raises scientific discussion is its expanding rings at the periphery. In 1994, Kwitter mentioned that Abell 61 is a planetary nebula that interacts with the interstellar medium (so called PN-ISM interaction), due to that it has asymmetric brightening - an increase of flux at its edge. As planetary nebulae expand and move through space with supersonic speeds, they become influenced by the conditions of the surrounding ISM. This interaction can fragment the halo of the PN and therefore allow the ISM to flow into the inner regions of the PN, shaping its morphology. Was it the reason for the rings? As suggested by Zijlstra in 2006, Abell 61's binary central star could be the culprit. The relatively thin expanding rings seen in various nebulae, including the Abell 61, could be the result of the central star having a close companion, with a period of hours to days, and the rings could appear due to the complex mass loss process that occurs inside. Here is my own take on this: could the rings be due to that Abell 61 is a bipolar PN, seen edge on? This looks like that if you imagine this shape in perspective. The axis runs from upper left to bottom right and we observe two rings with flux appearing increased where they overlap.

Link to full size JPEG: http://www.bcsatellite.net/bao/Abell61/abell61.jpg

zonalunar · Post by **zonalunar** » Fri Jul 01, 2011 9:52 pm

Veil Nebula in Narrowband
http://www.zonalunar.com
Copyright: Alfonso Carreño

: Click to view full size image

This mosaic of two subframes was obtained from a metropolitan city with high light pollution, using narrowband filters the months of May and June 2011. The equipment used is an apochromatic refractor 100 mm at f/4.8 and a camera Atik 383L+.

Location: Puzol, Valencia, Spain

Best Regards.

Wolfgang · Post by **Wolfgang** » Fri Jul 01, 2011 10:19 pm

VDB142
Copyright: Wolfgang Promper

: Click to view full size image

http://www.astro-pics.com/142plm.htm

Starship Asterisk*

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