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NGC1309
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NGC 1309 is a spiral galaxy located approximately 120 million light-years away in the constellation Eridanus. It is about 75,000 light-years across; about 3/4s the width of our own galaxy, the Milky Way. Its shape is classified as SA(s)bc, meaning that it has moderately wound spiral arms and no ring.
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NGC 1309 was discovered by German-British astronomer William Herschel  using a 47.5 cm (18.7 Inch) speculum reflecting telescope at Clayhall Farm House in Old Windsor on the 3rd October 1785.



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This dramatic spiral galaxy, catalogued as NGC 1309, in the constellation Eridanus was captured by the Hubble Space Telescope.

Recent observations of the galaxy taken in visible and infrared light come together in a colourful depiction of many of the galaxy's features. Bright blue areas of star formation pepper the spiral arms, while ruddy dust lanes follow the spiral structure into a yellowish central nucleus of older-population stars. The image is complemented by myriad far-off background galaxies.


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Position (2000): R.A. 03h 22m 05s.2880 Dec. +15° 23 ' 49 ".34

However, this galaxy image is more than just a pretty picture. It is helping astronomers to more accurately measure the expansion rate of the universe. NGC 1309 was home to supernova SN 2002fk, whose light reached Earth in September 2002. This supernova event, known as a Type Ia, resulted from a white dwarf star accreting matter from its companion in a binary star system. When the white dwarf collected enough mass and was no longer able to support itself, the star detonated, becoming the brightest object in the galaxy for several weeks.

Nearby Type Ia supernovae like SN 2002fk in NGC 1309 are used by astronomers to calibrate distance measures in the universe. By comparing nearby Type Ia supernovae to more distant ones, they can determine not only that the universe is expanding, but that this expansion is accelerating. However, this method only works if the distance to the host galaxies is known extremely well.

That's where the Hubble Telescope comes into play. Since NGC 1309 is relatively close to us, the high resolution of Hubble's Advanced Camera for Surveys can help accurately determine the distance to the galaxy by looking at the light output of a particular type of variable star called a Cepheid variable. Cepheids are well studied in our own galaxy, and vary regularly in brightness at a rate that is directly related to their total intrinsic brightness. By comparing their variation rate with how bright they appear, astronomers can deduce their distance. In this way, the Cepheids in NGC 1309 allow astronomers to accurately measure the distance to NGC 1309, and thus to SN 2002fk.
The expansion of the universe was discovered by Edwin Hubble, the Hubble Space Telescope's namesake, nearly a century ago, but the accelerating expansion is a recent discovery which has interesting consequences for cosmological models.

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