Daily Archives: August 25, 2014

The Sun Online and solar activity. August 25, 2014

The Sun produced several C-class flares and one isolated M-class flare. The C-class flares mainly originated from NOAA AR 2149. 
A partial halo CME was visible in SOHO/LASCO C2 imagery with first measurement on August 24 at 12:36 UT. The CME was also visible in Stereo B/COR2 images from 13:24 UT onwards. The CME is associated with a M6 flare peaking at 12:17 UT and a type II radio burst (shock speed estimated at 593
km/s by the San Vito station). NOAA AR 2151 is identified to be source region.
The CME is propagating in the eastern direction from the Sun-Earth line with a projected line-of-sight speed of 473 km/s (CACTus estimate). Due to the position of the source region, the CME is not expected to have an Earth-directed component.
Two filament eruptions occurred; one centered at S30E35 on August 24 at 13:29 UT and one centered at N15W15 lifting off on August 25 at 7:09 UT. No associated CMEs were identified so far. Flaring activity is expected to continue with C-class flares and potentially an M-class flare. 
Solar wind speed has decreased till 260 km/s currently. The amplitude of the interplanetary magnetic field ranged from 0 to 6 nT, with a varying Bz component. The phi angle was mostly negative (toward), but changed to positive (away) at 11:00 UT.  Geomagnetic conditions were quiet to unsettled and are expected to remain so until the combined arrival of the August 22 CME’s. This may potentially result in active geomagnetic conditions from the afternoon of August 26 onwards.
SIDC

 

Arp 188 and the Tadpole’s Tail 

arp188_hubble_4991

Image Credit: 
Hubble Legacy Archive, ESA, NASA; Processing & Copyright: Joachim Dietrich


Why does this galaxy have such a long tail? In this stunning vista, based on image data from the Hubble Legacy Archive, distant galaxies form a dramatic backdrop for disrupted spiral galaxy Arp 188, the Tadpole Galaxy. The cosmic tadpole is a mere 420 million light-years distant toward the northern constellation Draco. Its eye-catching tail is about 280 thousand light-years long and features massive, bright blue star clusters. One story goes that a more compact intruder galaxy crossed in front of Arp 188 – from right to left in this view – and was slung around behind the Tadpole by their gravitational attraction. During the close encounter, tidal forces drew out the spiral galaxy’s stars, gas, and dust forming the spectacular tail. The intruder galaxy itself, estimated to lie about 300 thousand light-years behind the Tadpole, can be seen through foreground spiral arms at the upper right. Following its terrestrial namesake, the Tadpole Galaxy will likely lose its tail as it grows older, the tail’s star clusters forming smaller satellites of the large spiral galaxy.

APOD NASA 25-Aug-14

M78 in Orion

8b8d65ff71604412a2057c31ba528088.1824x0_q100_watermark_watermark_opacity-40_watermark_position-4_watermark_text-Copyright Stefan Westphal
The nebula Messier 78 (also known as M 78 or NGC 2068) is a reflection nebula in the constellation Orion. It was discovered byPierre Méchain in 1780 and included by Charles Messier in his catalog of comet-like objects that same year.

M78 is the brightest diffuse reflection nebula of a group of nebulae that include NGC 2064, NGC 2067 and NGC 2071. This group belongs to the Orion Molecular Cloud Complex and is about 1,600 light years distant from Earth. M78 is easily found in smalltelescopes as a hazy patch and involves two stars of 10th magnitude. These two stars, HD 38563A and HD 38563B, are responsible for making the cloud of dust in M78 visible by reflecting their light.

About 45 variable stars of the T Tauri type, young stars still in the process of formation as well as some 17 Herbig–Haro objects are known in M78.
Imaging telescopes or lenses: William Optics FLT 132/925
Imaging cameras: Artemis Atik 383L+
Mounts: 10 Micron GM2000 QCI
Focal reducers: Tele Vue 0.8x Focal Reducer
Software: Adobe Photoshop CS2, DSS, Fitswork
Filters: Baader Planetarium 36mm Red, Baader Planetarium 36mm Green, Baader Planetarium 36mm Blue
Accessories: Lacerta MGEN2
Dates: Nov. 30, 2013, Dec. 2, 2013
Locations: Sahara, Marokko
Frames:
Baader Planetarium 36mm Blue: 7×600″ -20C bin 1×1
Baader Planetarium 36mm Green: 5×600″ -20C bin 1×1
Baader Planetarium 36mm Luminance: 11×600″ -20C bin 1×1
Baader Planetarium 36mm Red: 7×600″ -20C bin 1×1
Integration: 5.0 hours

Author: Stefan Westphal
AstroPhotography of the day by SPONLI 25 Aug 2014