August 2
The Harp String Vibrates
Sun Position
The Sun is in early Leo at roughly +18° declination, delivering long summer afternoons in the Northern Hemisphere and mild, lengthening nights in the Southern Hemisphere.
Sky Highlight
The Perseid meteor shower is building toward its mid-August peak; rates are still moderate in the first days of August but rising, with meteors radiating from the northern constellation Perseus. Northern Hemisphere observers have the better geometry, though the shower produces visible meteors worldwide.
Deep Sky Object
M57, the Ring Nebula in Lyra, lies only about 2,500 light-years away and is one of the most recognizable planetary nebulae in the sky, the glowing shell of gas expelled by a dying star, with the stellar remnant still visible at its center through larger apertures. It sits just a short star-hop from Vega, making this an ideal night to find it.
Featured Star
Vega, the brightest star in Lyra, is an A0Va main-sequence star a mere 25 light-years away, so close its light left Earth around the time humans first landed on the Moon. It was the first star photographed through a telescope and, thanks to Earth's axial wobble, will serve as the northern pole star again in roughly 14,000 years.
Around This Date
- August 2, 1932Carl Anderson photographed the first confirmed positron track in a cosmic-ray cloud chamber at Caltech, providing the first observational evidence for antimatter.
- August 4, 2007NASA's Phoenix Mars Lander launched on a mission to dig into the Martian arctic soil, where it later confirmed the presence of water ice just centimeters below the surface.
Vega is close enough to feel neighborly and old enough to remember a time when it was north star, a useful reminder that the sky we inherit is not the sky that always was.