Top Document: [sci.astro] Stars (Astronomy Frequently Asked Questions) (7/9) Previous Document: G.02 Are there any green stars? Next Document: G.04 What fraction of stars are in multiple systems? See reader questions & answers on this topic! - Help others by sharing your knowledge John E. Gizis <jeg@pistol.caltech.edu> [Table reflects most recent distances from Hipparcos.] The most luminous star within 10 light-years is Sirius. The most luminous star within 20 light-years is Sirius. The most luminous star within 30 light-years is Vega. The most luminous star within 40 light-years is Arcturus. The most luminous star within 50 light-years is Arcturus. The most luminous star within 60 light-years is Arcturus. The most luminous star within 70 light-years is Aldebaran. The most luminous star within 80 light-years is still Aldebaran. The most luminous star within 100 light-years is still...Aldebaran. The most luminous star within 1000 light-years is Rigel. (Honorable mentions: Canopus, Hadar, gamma Velae, Antares, and Betelgeuse.) The most luminous star within 2000 light-years is Rigel. The most luminous star in the whole Galaxy is *drum roll, please* .... Cygnus OB2 number 12, with an absolute magnitude around -10. (also known as VI Cygni No 12). A table listing the nearest stars (within 12 light years) may be found at http://www.ccnet.com/~galaxy/tab181.html. The faintest star within that distance is Giclas 51-15 with absolute visual magnitude 16.99 and spectral type M6.5. Wielen et al. published the following as the local luminosity function (total number of stars within 20 parsecs = 65 lightyears). At the faint end (abs. magnitude >12) this table is bit out of date and the numbers are probably too high. Everything from abs. magnitude 9 to 18 is considered an M dwarf (shows TiO and other molecules) or a white dwarf. abs. mag Number -1 1 0 4 1 14 2 24 3 43 4 78 5 108 Sun is here! 6 121 7 102 8 132 9 159 10 245 11 341 12 512 13 597 14 427 15 427 16 299 17 299 18 >16 User Contributions:Top Document: [sci.astro] Stars (Astronomy Frequently Asked Questions) (7/9) Previous Document: G.02 Are there any green stars? Next Document: G.04 What fraction of stars are in multiple systems? Part0 - Part1 - Part2 - Part3 - Part4 - Part5 - Part6 - Part7 - Part8 - Single Page [ Usenet FAQs | Web FAQs | Documents | RFC Index ] Send corrections/additions to the FAQ Maintainer: jlazio@patriot.net
Last Update March 27 2014 @ 02:11 PM
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