Daily Archives: June 25, 2014

The Sun Online and solar activity. June 25, 2014

The strongest flare in past 24 hours was a class C1.2, with peak at 21:03 UT from Catania 92 (NOAA AR 2096). No significant flare activity is expected for the next 48 hours.Geomagnetic conditions have been quiet.
There are no clear indications of the passage of the CMEs from 20 and 21 June. They could still arrive later on today and cause active geomagnetic conditions.


The Hercules Cluster of Galaxies 

Abell 2151
Image Credit & Copyright: Ken Crawford

These are galaxies of the Hercules Cluster, an archipelago of island universes a mere 500 million light-years away. Also known as Abell 2151, this cluster is loaded with gas and dust rich, star-forming spiral galaxies but has relatively few elliptical galaxies, which lack gas and dust and the associated newborn stars. The colors in this remarkably deep composite image clearly show the star forming galaxies with a blue tint and galaxies with older stellar populations with a yellowish cast. The sharp picture spans about 3/4 degree across the cluster center, corresponding to over 6 million light-years at the cluster’s estimated distance. Diffractionspikes around brighter foreground stars in our own Milky Way galaxy are produced by the imaging telescope’s mirror support vanes. In the cosmic vista many galaxies seem to be colliding or merging while others seemdistorted – clear evidence that cluster galaxies commonly interact. In fact, the Hercules Cluster itself may be seen as the result of ongoing mergers of smaller galaxy clusters and is thought to be similar to young galaxy clusters in the much more distant, early Universe.

APOD NASA 25-Jun-14

Jellyfish Nebula in the constellation Gemini

IC 443 (also known as the Jellyfish Nebula and Sharpless 248 (Sh2-248)) is a Galactic supernova remnant (SNR) in the constellation Gemini. On the plan of the sky, it is located near the star Eta Geminorum. Its distance is roughly 5,000 light years from Earth.

The remnant’s age is still uncertain. There is some agreement that the progenitor supernova happened between 3,000 and 30,000 years ago. Recent Chandra and XMM-Newton observations identified a plerion nebula, close to the remnant southern rim. The point source near the apex of the nebula is a neutron star, relic of a SN explosion. The location in a star forming region and the presence of a neutron star favor a Type II supernova, the ultimate fate of a massive star, as the progenitor explosion.

Imaging telescopes or lenses: Orion Optics UK CT8
Imaging cameras: SBIG ST-8300C, SBIG ST-8300M
Guiding telescopes or lenses: Orion Optics UK CT8
Guiding cameras: Starlight Xpress Lodestar guide camera
Focal reducers: Baader Planetarium RCC
Software: Maxim DL, photoshop
Filters: Baader Planetarium 7nm H-Alpha, Hutech IDAS LPS-P2
Accessories: Celestron Radial Guider
Dates: Dec. 3, 2013, Dec. 27, 2013
Baader Planetarium 7nm H-Alpha: 26×900″ bin 1×1
Hutech IDAS LPS-P2: 29×600″ bin 1×1
Integration: 11.3 hours

Author: Jacek Bobowik
AstroPhotography of the day by SPONLI 25 June 2014