Celestial hemisphere:  Northern  ·  Constellation: Leo (Leo)  ·  Contains:  NGC 2903  ·  NGC 2905  ·  NGC 2916
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NGC 2903, Jerry Yesavage
NGC 2903, Jerry Yesavage

NGC 2903

Getting plate-solving status, please wait...
NGC 2903, Jerry Yesavage
NGC 2903, Jerry Yesavage

NGC 2903

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Description

A new view using the full framed ASI 6200.  Happy about how this could be blown up from a crop that started at 9000x6000 pixels.

From Wikipedia:

NGC 2903 is an isolated barred spiral galaxy in the equatorialconstellation of Leo, positioned about 1.5° due south of Lambda Leonis.[10]   It was discovered by German-born astronomer William Herschel, who cataloged it on November 16, 1784.   He mistook it as a double nebula, as did subsequent observers, and it wasn't until the nineteenth century that the Third Earl of Rosse resolved into a spiral form.[5]J. L. E. Dreyer assigned it the identifiers 2903 and 2905 in his New General Catalogue;  NGC 2905 now designates a luminous knot in the northeastern spiral arm.[11]

This field galaxy[12] is located about 30[3] million light-years away from the Milky Way, and is a member of the Virgo Supercluster.[4]   The morphological classification of this galaxy is SBbc,[6] indicating a barred spiral (SB) with moderate to tightly-wound spiral arms (bc). De Vaucouleurs and associates assigned it the class SAB(rs)bc, suggesting a weaker bar structure (SAB) with a partial ring (rs).  The bar structure appears stronger in the near infrared band.

The galaxy as a whole is inclined by an angle of 60° to the line of sight from the Earth.[7]72% of the stellar mass is located in the outer disk of the galaxy, and 20% is found in the bar.   The bulge adds 5% of the stellar mass, and its star population is generally older.[13] However, the central ~650 pc radius volume of the core is a strong starburst region.

The star formation rate here is 0.7 M y−1 and it is being fed by gas inflow along the bar. There is no evidence of an active nucleus.[7]  The irregular dwarf galaxy KKH 51 appears to be a companion, as they have an angular separation of 25 and nearly the same radial velocity.[14]

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