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NGC 2573
NGC 2573, also known as Polarissima Australis, is a barred spiral galaxy located in the constellation Octans. It has an apparent magnitude of 13.25, making it readily visible in medium-sized telescopes, but not to the naked eye. The object is located relatively far at a distance of 84 million light years and it is currently receding with a heliocentric radial velocity of 2495 km/s. Using a redshift of z = 0.08102 yields a greater distance of 109 million light years.
The galaxy was discovered on March 29th, 1837 by English astronomer John Herschel. It is the closest NGC object to the south celestial pole, hence the nickname "Polarissima Australis".
In the De Vaucouleurs system, NGC 2573 has a morphological classification of SAB(s)cd:, indicating that it is a weakly-barred spiral galaxy with loosely bound spiral arms and a small, faint bulge. The (s) notation indicates that the galaxy has a purely spiral structure. There is uncertainty about the classification, possibly due to NGC 2573's faintness. NGC 2573 is estimated to be 77,800 light years across, making it similar in size to the Milky Way. Alternatively, it has a central mass of 3.229×1011 M☉, which is 28% of the latter's mass.
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NGC 2573
NGC 2573, also known as Polarissima Australis, is a barred spiral galaxy located in the constellation Octans. It has an apparent magnitude of 13.25, making it readily visible in medium-sized telescopes, but not to the naked eye. The object is located relatively far at a distance of 84 million light years and it is currently receding with a heliocentric radial velocity of 2495 km/s. Using a redshift of z = 0.08102 yields a greater distance of 109 million light years.
The galaxy was discovered on March 29th, 1837 by English astronomer John Herschel. It is the closest NGC object to the south celestial pole, hence the nickname "Polarissima Australis".
In the De Vaucouleurs system, NGC 2573 has a morphological classification of SAB(s)cd:, indicating that it is a weakly-barred spiral galaxy with loosely bound spiral arms and a small, faint bulge. The (s) notation indicates that the galaxy has a purely spiral structure. There is uncertainty about the classification, possibly due to NGC 2573's faintness. NGC 2573 is estimated to be 77,800 light years across, making it similar in size to the Milky Way. Alternatively, it has a central mass of 3.229×1011 M☉, which is 28% of the latter's mass.