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Monday, May 25, 2015

Astronomy Now- ( HERE, TOO, INTEREST IN THAT NASTY STAR-)

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This artist's illustration reveals a vast disc of gas surrounding a massive, bright Wolf-Rayet star known by its catalogue name of NaSt1. A close companion star is pulling gas from the Wolf-Rayet, shown by the bridge of bright material connecting the two stars. This act of celestial cannibalism exposes the massive star's hot, helium core. Some of the material, however, is escaping into space, forming the huge disc. This disc structure has never been seen before around a Wolf-Rayet star. Image credit: NASA, ESA, and G. Bacon (STScI).

Hubble observes one-of-a-kind star nicknamed ‘Nasty 1′

Astronomers were surprised to find a disc-like structure around a hefty, rapidly aging star nicknamed "Nasty 1," which has never been seen before around a Wolf-Rayet star in our galaxy. The star may represent a brief transitory stage in the evolution of massive stars. 

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The Night Sky

  • The 2015 opposition of Saturn occurs in the constellation of Libra on May 23rd. Southern Hemisphere observers are favoured owing to the planet's southerly declination, but on nights of calm seeing much detail will still be seen in modest instruments from the British Isles. Saturn is conveniently situated a little over 10° — the span of a fist at arm's length — to the upper right of Antares in Scorpius. The ringed planet is highest in the sky around 1 am BST on May 23rd, reaching this position half and hour earlier with each passing week. AN graphic by Ade Ashford.

    See ringed planet Saturn at its best

    Often referred to as the Jewel of the Solar System, Saturn reaches opposition on May 23rd and is currently best placed for observation during 2015. Despite the planet's southerly declination, its glorious ring system is favourably tipped in our direction with the northern hemisphere on show. 
  • Venus currently lies near the position occupied by the Sun at the June solstice in the constellation of Gemini, has a declination exceeding +26° and is close to its greatest easterly elongation from the Sun — all these factors conspire to keep Venus above the horizon for a long time after sunset in mid-May for Northern Hemisphere observers. How late can you see it from where you live? AN graphic by Ade Ashford.
    Venus’ late night show in May
  • AN graphic by Ade Ashford

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