Categories: Observing

Observing Alert: Outburst of GK Persei

[/caption]

Wake up, all you variable star observers!! According to AAVSO Alert Notice 384 released just minutes ago, the cataclysmic variable star – GK Persei – is beginning to wake up and appears to be entering another outburst.

According to Matthew Templeton: “As reported in AAVSO Special Notice #125, the cataclysmic variable GK Persei appears to be entering another outburst. The object began a slow rise on or about 2008 September 10 UT (JD 2454719.5), rising nearly one magnitude above its typical quiescent level of m(vis) = 13, to near m(vis) = 12.2 at present (2008 September 24 UT, JD 2454733.5). This rate of brightening is typical of past outbursts, and suggests a rise to full outburst may occur soon. However, this activity comes much sooner than expected based on past intervals between outbursts, and the last outburst (2006 December 5, JD 2454075) reached a much fainter maximum than normal — about m(vis)=11.5, more than one magnitude fainter than the typical m(vis)=10.5-10.0.

Locator Chart (AAVSO)
Observers are asked to closely follow GK Persei at all wavelengths during the current outburst, however it may evolve. Both visual and filtered CCD photometry are strongly encouraged.

The most recent visual (M. Komorous) and V-band CCD (D. Lane) made around 2008 September 24.2 UT (JD 2454733.7) have GK Persei around m(vis) = 12.2 to 12.3. GK Persei (AUID 000-BBG-044) is located at the following J2000 coordinates: RA: 03 31 12.00 , Dec +43 54 15.0

Charts for GK Per may be plotted using VSP

Please promptly submit all observations to the AAVSO via WebObs. Thanks to all observers who have reported GK Per in outburst and who have submitted observations thus far!”

Clear skies, good luck and good observing….

Tammy Plotner

Tammy was a professional astronomy author, President Emeritus of Warren Rupp Observatory and retired Astronomical League Executive Secretary. She’s received a vast number of astronomy achievement and observing awards, including the Great Lakes Astronomy Achievement Award, RG Wright Service Award and the first woman astronomer to achieve Comet Hunter's Gold Status. (Tammy passed away in early 2015... she will be missed)

Recent Posts

Astronomers Find a 3 Million Year Old Planet

Astronomers have just found one of the youngest planets ever. At only 3 million years…

18 hours ago

There was Hot Water on Mars 4.45 Billion Years Ago

Mars formed 4.5 billion years ago, roughly the same time as the Earth. We know…

22 hours ago

Axion Dark Matter May Make Spacetime Ring

Dark matter made out of axions may have the power to make space-time ring like…

1 day ago

Earth’s Old Trees Keep A Record of Powerful Solar Storms

Most of the time the Sun is pretty well-mannered, but occasionally it's downright unruly. It…

2 days ago

New Supercomputer Simulation Explains How Mars Got Its Moons

One mystery in planetary science is a satisfying origin story for Mars's moons, Phobos and…

2 days ago

The Early Universe May Have Had Giant Batteries of Dust

The largest magnetic fields in the universe may have found themselves charged up when the…

2 days ago