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 held together by its gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night, but their immense distances from Earth make ...
s in the
constellation 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. T ...
are close together: π
1 is nearly 9° north of π
6 (
Tau Eridani
Tau Eridani (τ Eridani, τ Eri) is a group of fairly widely scattered stars in the constellation Eridanus.
They form an exception to the general rule that stars that share the same Bayer designation are close together: τ1 is nearly 20° away f ...
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 u ...
'' 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)
/ref>
See also
*Orion's Belt
Orion's Belt or the Belt of Orion, also known as the Three Kings or Three Sisters, is an asterism in the constellation Orion. It consists of the three bright stars Alnitak, Alnilam and Mintaka.
Looking for Orion's Belt is the easiest way to lo ...
*Orion's Sword Orion's Sword is a compact asterism in the constellation Orion. It comprises three stars (42 Orionis, Theta Orionis, and Iota Orionis) and M42, the Orion Nebula, which together are thought to resemble a sword or its scabbard. This group is south ...
References
{{Set index article, astronomical objects
Lists of stars
Orion (constellation)
Orionis, Pi
Orion's Shield