Pi Orionis (π Ori, π Orionis) is a group of fairly widely scattered

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

s in the

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Orion that constitute the asterism Orion's Shield or Orion's Bow.astrofoto.org
"Orion: The Hunter"
, Roland B. Roberts They form an exception to the general rule that stars that share the same

Bayer designation A Bayer designation is a stellar designation in which a specific star is identified by a Greek or Latin letter followed by the genitive form of its parent constellation's Latin name. The original list of Bayer designations contained 1,564 stars. ...

are close together: π¹ is nearly 9° north of π⁶ ( Tau Eridani is an even more noteworthy example of this). * π¹ Ori (''7 Orionis'') * π² Ori (''2 Orionis'') * π³ Ori (''1 Orionis'') * π⁴ Ori (''3 Orionis'') * π⁵ Ori (''8 Orionis'', forms a visual double with ''5 Orionis'') * π⁶ Ori (''10 Orionis'') All of them were member of asterism 參旗 (Shēn Qí), ''Banner of Three Stars'', ''

Net Net or net may refer to: Mathematics and physics * Net (mathematics), a filter-like topological generalization of a sequence * Net, a linear system of divisors of dimension 2 * Net (polyhedron), an arrangement of polygons that can be folded up ...

'' mansion.AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 (Astronomy Education News) 2006 年 7 月 13 日 (2006-07-13)
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References

{{Set index article, astronomical objects Lists of stars Orion (constellation) Orionis, Pi Orion's Shield

See also

References