Unexplained brightening of AKO 9 in 47 Tucanae
This is a reproduction of two images obtained in late 1996 with the Hubble Space Telescope (HST) , showing the field of the variable star AKO 9 at the centre of the southern globular cluster 47 Tucanae .
This star brightened by more than 2 magnitudes (a factor of seven) in less than 1 hour. Left: the first frame; right: the last frame in a series of 15 exposures, obtained during a period of just over 4 hours.
Yhe field of each image measures 3.9 arcsec x 3.9 arcsec. North is up and East is to the left.
No other star among the > 30,000 studied was found to have such a large amplitude.
About the Image
|Release date:||15 January 1997|
|Size:||3284 x 1629 px|
About the Object
|Name:||47 Tucanae, AKO 9|
|Type:||Milky Way : Star : Type : Variable|
Milky Way : Star : Grouping : Cluster : Globular
|Distance:||15000 light years|
Colours & filters
|300 nm||Hubble Space Telescope|
Exposure time: 4350s