Sagitta has the arrow

Small Northern Hemisphere Constellation

Finding the stars with the naked eye – astronomy starts by looking up at the sky without any optical prejudice.

Sagitta is a dim but distinctive constellation in the northern sky. Its name is Latin for “arrow”, and it should not be confused with the larger constellation Sagittarius, the archer. Although Sagitta is an ancient constellation, it has no star brighter than 3rd magnitude and has the third-smallest area of all constellations (only Equuleus and Crux are smaller). It was included among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations defined by the International Astronomical Union. Located to the north of the equator, Sagitta can be seen from every location on Earth except within the Antarctic circle.

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Still looking for constellations in the summer time night sky. This is about Sagitta not Sagittarius.

Sagitta is here – Somewhere

Visit the Constellation Guide to see more about constellations and the night sky.

 

 

saucepan of star feast

Naked Eye Dark Sky Ursa Major

Cooking Top Stars of The Saucepan

The most reliable of the Northern Hemisphere to see – the Plough is likely the first constellation you recognize when you first ‘Look up’.  

 

night sky super star

Betelgeuse in Orion

Making the most of seeing the magnificent Orion Constellation in the last week. The most distinctive and interesting of all the constellations in the Northern Hemisphere.

Starting with Betelgeuse (or beetlejuice if you prefer! )

Always new things being discovered – Result for Betelgeuse then!

Only last month, the speed of the star has been questioned – Post on Phys Site, December 2016.

In the Super Star Constellation – Orion.

I’m always so pleased to see it back in the sky!

Orion The Hunter

 

#NakedEyeDarkSky

Oh No – It’s that damned Dark Energy thang

In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to 

#NakedEyeDarkSky

Oh No – It’s that damned Dark Energy thang

In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to 

Oh No – It’s that damned Dark Energy thang

In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe.

Radiation Photo Effect.

Dark energy is the most accepted hypothesis to explain the observations since the 1990s indicating that the universe is expanding at an accelerating rate.

According to the Planck mission team, and based on the standard model of cosmology, on a mass–energy equivalence basis, the observable universe contains 26.8% dark matter, 68.3% dark energy (for a total of 95.1%) and 4.9% ordinary matter.

Again on a mass–energy equivalence basis, the density of dark energy (6.91 × 10⁻²⁷ kg/m³) is very low, much less than the density of ordinary matter or dark matter within galaxies.

However, it comes to dominate the mass–energy of the universe because it is uniform across space.

Arcturus

Naked Eye Sky View of Arcturus

Arcturus of the constellation Boötes is the brightest star in the northern celestial hemisphere. With a visual magnitude of −0.04, it is the fourth brightest star in the night sky, after −1.46 magnitude Sirius, −0.86 magnitude Canopus, and −0.27 magnitude Alpha Centauri. It is a relatively close star at only 36.7 light-years from Earth, and, together with Vega

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Arcturus

Naked Eye Sky View of Arcturus

Arcturus of the constellation Boötes is the brightest star in the northern celestial hemisphere. With a visual magnitude of −0.04, it is the fourth brightest star in the night sky, after −1.46 magnitude Sirius, −0.86 magnitude Canopus, and −0.27 magnitude Alpha Centauri. It is a relatively close star at only 36.7 light-years from Earth, and, together with Vega

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Arcturus

Naked Eye Sky View of Arcturus

 

Arcturus of the constellation Boötes is the brightest star in the northern celestial hemisphere. With a visual magnitude of −0.04, it is the fourth brightest star in the night sky, after −1.46 magnitude Sirius, −0.86 magnitude Canopus, and −0.27 magnitude Alpha Centauri. It is a relatively close star at only 36.7 light-years from Earth, and, together with Vega and Sirius, one of the most luminous stars in the Sun‘s neighborhood.

Arcturus is a type K0 III orange giant star, with an absolute magnitude of −0.30. It has likely exhausted its hydrogen from its coreand is currently in its active hydrogen shell burning phase. It will continue to expand before entering horizontal branch stage of its life cycle.

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Deneb the Huge Summertime Star

Cygnus featuring Deneb

The brightest star in the constellation Cygnus and one of the vertices of the Summer Triangle. It is the 19th brightest star in the night sky, with an apparent magnitude of 1.25. A blue-white supergiant, Deneb is also one of the most luminous nearby stars. However, its exact distance (and hence luminosity) has been difficult to calculate, so it is somewhere between 55,000…

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