NOAA AR 1909 produced an M1.2-flare peaking at 07:29UT. A plasma eruption was seen in this neighbourhood on December 5 around 21UT. An unstable filament in the neighbourhood of an active region is a recipe of disaster. The curve for the background X-ray radiation is situated near the
top/bottom of the B/C level. The chances for more M-flares are around 30%.The fast stream linked with the coronal hole that approached the central meridian on December 3 might arrive late today and introduce unsettled/active conditions: K=3 up to 4. The filament eruption on December 5, around 21UT might have a glancing blow. There is no data of SOHO/LASCO at that time. The amount of available STEREO A data is also limited. A first estimate gives a speed of around 500 km/s. The shock might arrive late on December 9.
INFO FROM SIDC
Equipment: Coronado 90 + SBIG 8300s + LX75
Time UT: 04:00
Exposure 0.8 sec.
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Image Credit & Copyright: Yuri Beletsky (Las Campanas Observatory, Carnegie Institution)
Brightest stellar beacons of the constellation Centaurus, Alpha and Beta Centauri are easy to spot from the southern hemisphere. For now, so is new naked eye Nova Centauri 2013. In this night skyscape recorded near Las Campanas Observatory in the Chilean southern Atacama desert on December 5, the new star joins the old in the expansive constellation, seen at early morning hours through a greenish airglow. Caught by nova hunter John Seach from Australia on December 2 as it approached near naked eye brightness, Nova Cen 2013 has been spectroscopically identified as a classical nova, an interacting binary star system composed of a dense, hot white dwarf and cool, giant companion. Material from the companion star builds up as it falls onto the white dwarf’s surface triggering a thermonuclear event. The cataclysmic blast results in a drastic increase in brightness and an expanding shell of debris. The stars are not destroyed, though. Classical novae are thought to recur when the flow of material onto the white dwarf eventually resumes and produces another outburst.
APOD NASA 7-Dec-13
The Rosette Nebula is a large, circular H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, the starsof the cluster having been formed from the nebula’s matter.
The cluster and nebula lie at a distance of some 5,200 light-years from Earth (although estimates of the distance vary considerably, down to 4,900 light-years.) and measure roughly 130 light years in diameter. The radiation from the young stars excite the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.
Imaging telescopes or lenses: PlaneWave Instruments Planewave 20″ CDK
Mounts: Planewave Instruments Ascension 200HR
Dates: Dec. 5, 2013
Astrodon Red G2E: 3×600″ bin 1×1
Astrodon Blue: 3×600″ bin 1×1
Astrodon Green: 3×600″ bin 1×1
Astrodon Ha: 9×600″ bin 1×1
Astrodon Luminance: 6×600″ bin 1×1
Autor: Federico Pelliccia
AstroPhotography of the day by SPONLI
December 07, 2013
We select the best works of amateur astrophotographers with details of equipment, shooting processing etc.