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Selected Star Systems Within 20 Parsecs (65 Light Years)
DEEP FLY 2007: larger version (735 KB)

The radius of the inner ring is 13 light years (4 parsecs); each successive ring represents an additional 13 light years. Numbers at the perimeter represent approximate right ascension, measured in hours. Asterisks indicate exoplanetary systems. For more information, see Table of Selected Nearby Star Systems. Last update January 2008.



links



selected
nearby
star systems
Table of Selected Nearby Star Systems


notable
nearby stars
SolStation's Notable Nearby Stars


nearby stars
to scale
Comparative sizes of nearby exoplanetary host stars


all about
exoplanets
Linked Web pages on extrasolar planetary systems


nearest
black hole
The nearest black hole


glossary
Glossary of astronomical terms

This diagram is a visual summary of the Solar neighborhood, seen from the perspective of an observer located in the northern celestial hemisphere. Within 65 light years of the Sun, it includes:

  • Most of the brightest stars
  • All known exoplanetary systems with three or more planets
  • All known exoplanetary systems centered on M-type (red dwarf) stars
  • A selection of other notable nearby stars, both with and without planets

The volume of space within 65 light years (20 parsecs) of our Sun is well studied and better understood than any other region of the extrasolar universe. If our species ever expands into interstellar space, the Solar neighborhood will be the scene of our earliest missions of exploration and colonization. Key attributes of this region are probably typical of our entire Local Bubble.

Our immediate neighborhood lacks the very brightest species of stars, represented by spectral classes O and B. Thus the most luminous star systems within this 20-parsec radius contain either giants (e.g., Capella, Arcturus, Pollux), subgiants (e.g., Procyon), or blue-white main sequence stars of spectral class A (e.g., Sirius, Vega). A total of 15 systems within this radius contain A stars (see SolSation.com); shown here are 11, some of which contain binary or multiple stars.

In order of decreasing mass and luminosity, the remaining spectral classes represented in our neighborhood are F, G, K, and M. Stellar populations increase as mass decreases, so that each spectral class has a much larger population than the one above it. In addition to the 15 systems containing A stars, the local neighborhood includes almost 90 yellow-white stars of type F (like Upsilon Andromedae), more than 130 yellow stars of type G (like Sol and Tau Ceti), more than 300 orange stars of type K (like Epsilon Eridani) and several hundred red dwarfs of type M (like GJ 876).

Because the present diagram focuses on exoplanetary systems and bright "landmark" stars (those most visible from the greatest distances), it is misleading. We should picture this region with a heavy peppering of dim red stars, along with hundreds more of the yellowish and orange stars that furnish the best candidates for planetary hosts. Such detail, unfortunately, would make a small-format diagram indecipherable.

Absent from our neighborhood are the extreme objects that typically fascinate astronomers – pulsars, quasars, black holes, neutron stars, dark matter filaments. The closest known neutron star is about 200 light years away, while the closest known black hole is 1600 light years away. If we seek prodigies nearby, we must be satisfied by white dwarf stars like the binary companion of Sirius, giant stars like Arcturus, and multiple star systems like the Castor sextet.

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Stars within 40 parsecs of the Sun
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The Local Bubble









All text is copyright Raymond Harris 2006-2008. Image credits appear in the accompanying caption.