Daily Archives: February 20, 2014

Comet Lovejoy over the Great Wall


Image Credit & Copyright:
 Jiajie Zhang

Fading now as it returns to the outer solar system Comet Lovejoy (C/2013 R1) still graces planet Earth’s sky, a delicate apparition in binoculars or small telescopes. The comet, a relic of the solar system’sformative years, is seen here rising in the morning twilight on January 12 among the stars of Ophiuchus, the Serpent Bearer. Posing near the comet is bright star Alpha Ophiuchi, also known as Rasalhague, from Arabic “the head of the serpent collector”. Of course, the serpentine shape below is the ancient Great Wall of China, along the Panlongshan section northeast of Beijing. Panlongshan is translated as “a coiled dragon”. A moving and fortuitous scene, it was captured with a digital camera and telephoto lens in two consecutive exposures. The exposures were merged to show a natural looking foreground and twilight sky.
NASA APOD 20-feb-2014

IC 5146: Cocoon Nebula in Cygnus

IC 5146 
 is a reflection/emission nebula in the constellation Cygnus.  IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula. The cluster is also known as Collinder 470.  It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39. The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago; the nebula is about 12 arcmins across, which is equivalent to a span of 15 light years. When viewing IC 5146, dark nebula Barnard 168 (B168) is an inseparable part of the experience, forming a dark lane that surrounds the cluster and projects westward forming the appearance of a trail behind the Cocoon.

Imaging telescopes or lenses: Planewave Instruments Planewave 12.5″ CDK
Imaging cameras: QSI 583wgs 8 filter wheel
Mounts: Software Bisque Paramount ME
Guiding telescopes or lenses: Planewave Instruments Planewave 12.5″ CDK
Guiding cameras: Starlight Xpress Lodestar
Software: Adobe Paint Shop cs6, Pleiades Astrophoto, S.L. PixInsight 1.8
Filters: Astrodon LRGB
Dates: Oct. 16, 2013
Frames: 128×1200″
Integration: 42.7 hours

Autor: Julian Hancock

AstroPhotography of the day by SPONLI

20 February 2014

We select the best works of amateur astrophotographers with details of equipment, shooting processing etc.