The Nearest Celestial Systems

13 light-years (4 parsecs) is around the maximum distance for missions if we wish to begin getting data back from the system within 30 years of launch. This assumes technology that can send an interstellar vessel at a cruise speed of 0.8 light-speed with 1g acceleration to and from the cruise speed. However these values for acceleration and cruise speed are somewhat arbitrary and missions can be discussed with a range of these values.

In the listing below, the locations of the systems are given in Galactic Coordinates: (distance in light-years, galactic longitude, galactic latitude). Longitude values between 180 and 360 are given in the equivalent negative sense (such as 270 being -90). Galactic Coordinates are very important in developing a sense of where these systems are relative to Sol (the Sun) and each other. With the galactic north pole directly overhead, zero degrees longitude and latitude is taken to be the galactic center with longitude increasing as one turns to the left along the galactic plane for 360 degrees. Positive 90 degrees latitude is the galactic north pole (positive latitude is above the galactic plane) and negative 90 degrees is the galactic south pole (negative latitude is below the galactic plane), with 0 degrees latitude being the galactic plane itself.

Alpha Centauri

This system includes three stars: types G2 V, K1 V and M5.5 V

Galactic Coordinates:
For Alpha Centauri AB: (4.4 ly, -44, -1)
For Proxima Centauri: (4.2 ly, -46, -2)

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Barnard's Star

This system includes one star: type M3.8 V

Galactic Coordinates:
(6.0 ly, 31, 14)

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Luhman 16

This system includes two brown dwarfs: types L7.5 and T0.5

Galactic Coordinates:
(6.6 ly, -74, 5)

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WISE 0855-0714

This system includes one brown dwarf: type Y

Galactic Coordinates:
(7.2 ly, -124, 24)

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Wolf 359

This system includes one star: type M5.8 V

Galactic Coordinates:
(7.8 ly, -115, 56)

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Lalande 21185

This system includes one star: type M2.0 V

Galactic Coordinates:
(8.3 ly, -175, 66)

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Sirius

This system includes two stars: types A1 V and DA2

Galactic Coordinates:
(8.6 ly, -132, -8)

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Luyten 726-8

This system includes two stars: type M5.5 V and M6.0 V

Galactic Coordinates:
(8.7 ly, 176, -75)

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Ross 154

This system includes one star: type M3.5 V

Galactic Coordinates:
(9.7 ly, 12, -11)

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Ross 248

This system includes one star: type M5.5 V

Galactic Coordinates:
(10.3 ly, 111, -17)

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Epsilon Eridani

This system includes one star: type K2 V

Galactic Coordinates:
(10.5 ly, -164, -47)

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Lacaille 9352

This system includes one star: type M1.5 V

Galactic Coordinates:
(10.7 ly, 5, -67)

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Ross 128

This system includes one star: type M4 V

Galactic Coordinates:
(10.9 ly, -88, 60)

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WISE 1506+7027

This system includes one brown dwarf: type T6

Galactic Coordinates:
(11.1 ly, 108, 43)

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Luyten 789-6

This system includes three stars: types M5.0 V, M5 V and M7 V

Galactic Coordinates:
(11.3 ly, 48, -57)

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61 Cygni

This system includes two stars: types K5.0 V and K7.0

Galactic Coordinates:
(11.4 ly, 83, -6)

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Procyon

This system includes two stars: types F5 V-IV and DQZ

Galactic Coordinates:
(11.4 ly, -146, 14)

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Struve 2398

This system includes two stars: types M3.0 V and M3.5 V

Galactic Coordinates:
(11.5 ly, 89, 24)

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Groombridge 34

This system includes two stars: types M1.5 V and M3.5 V

Galactic Coordinates:
(11.7 ly, 117, -18)

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Epsilon Indi

This system includes one star and two brown dwarfs: types K5 V, T1 and T6

Galactic Coordinates:
(11.8 ly, -24, -49)

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Giclas 51-15

This system includes one star: type M6.5 V

Galactic Coordinates:
(11.8 ly, -163, 33)

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Tau Ceti

This system includes one star: type G8.5 V

Galactic Coordinates:
(11.9 ly, 174, -73)

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Luyten 372-58

This system includes one star: type M5.5 V

Galactic Coordinates:
(12.0 ly, -109, -53)

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WISE 0350-5658

This system includes one brown dwarf: type Y1

Galactic Coordinates:
(12.1 ly, -91, -47)

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Luyten 725-32

This system includes one star: type M4.5 V

Galactic Coordinates:
(12.1 ly, 152, -78)

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Luyten's Star

This system includes one star: type M3.5 V

Galactic Coordinates:
(12.3 ly, -147, 11)

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Teegarden's Star

This system includes one star: type M6.5 V

Galactic Coordinates:
(12.6 ly, 161, -36)

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SCR 1845-6357

This system includes one star and one brown dwarf: types M8.5 V and T5.5

Galactic Coordinates:
(12.6 ly, -28, -24)

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Kapteyn's Star

This system includes one star: type M1.5 V

Galactic Coordinates:
(12.8 ly, -110, -36)

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Lacaille 8760

This system includes one star: type K9 V

Galactic Coordinates:
(12.9 ly, 4.23, -45)

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