Daily Archives: July 13, 2014

The Sun Online and solar activity. July 13, 2014

Five C-class flares were observed since the last bulletin. The activity mainly originated from NOAA ARs 2108, 2109 and 2113. The largest flare was a C6.4 flare, peaking at 9:03 on July 13, originating from NOAA AR 2109, approaching the West limb.  No Earth-directed CMEs were observed. C-class flares are expected, with an increasing chance for an isolated M-class flare. Due to the location of NOAA ARs 2108 and 2109, with increasing activity, a warning condition for a potential proton event is issued. Solar wind speed reached values between 350 and 400 km/s.  The magnitude  of  interplanetary magnetic field increased from 5 to 9 nT with a currently positive Bz component.  No clear signatures of a shock arrival
of the July 9 CME were observed yet. Geomagnetic conditions have been quiet to unsettled. This is expected to remain so till the possible arrival of a glancing blow of the July 9 CME, which might increase
geomagnetic activity.

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 07/13/14
Time UT: 16:00
Exposure 1/500 sec.

Observatory Sponli


Planetary Nebula NGC 2818 from Hubble 

Planetary Nebula NGC 2818, Hubble Space Telescope
Image Credit: NASA, ESA, Hubble Heritage Team (STScI / AURA)

 NGC 2818 is a beautiful planetary nebula, the gaseous shroud of a dying sun-like star. It could well offer a glimpse of the future that awaits our own Sun after spending another 5 billion years or so steadily using up hydrogen at its core, and then finally helium, as fuel for nuclear fusion. Curiously, NGC 2818 seems to lie within an open star cluster, NGC 2818A, that is some 10,000 light-years distant toward the southern constellation Pyxis (the Compass). At the distance of the star cluster, the nebula would be about 4 light-years across. But accurate velocity measurements show that the nebula’s own velocity is very different from the cluster’s member stars. The result is strong evidence that NGC 2818 is only by chance found along the line of sight to the star cluster and so may not share the cluster’s distance or age. The Hubble image is a composite of exposures through narrow-band filters, presenting emission from nitrogen, hydrogen, and oxygen atoms in the nebula as red, green, and blue hues.

APOD NASA 13-Jul-14

Dark nebula SH2-136

SH2-136 is a an illuminated dark nebula, about 1,200 light-years away, towards the constellation Cepheus.  The complex process of star formation create dust clouds of many shapes and sizes.

Imaging telescopes or lenses: Sky-Watcher Newton 8″
Imaging cameras: Canon EOS 550D / Rebel T2i
Mounts: Skywatcher Neq6 pro synscan
Guiding cameras: QHY5
Focal reducers: Sky-Watcher Coma corrector
Software: DeepSkyStacker, PHD guiding, photoshop
Dates: Oct. 4, 2013
Frames: 10×600″
Integration: 1.7 hours

Author: Ivan Jevremovic
AstroPhotography of the day by SPONLI 13 July 2014