Pi Orionis (π Ori, π Orionis) is a group of fairly widely scattered
star
A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sk ...
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 first constellati ...
Orion
Orion may refer to:
Common meanings
* Orion (constellation), named after the mythical hunter
* Orion (mythology), a hunter in Greek mythology
Arts and media
Fictional entities Characters and species
* Orion (character), a DC Comics c ...
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 alphabet, Greek or Latin letter followed by the genitive case, genitive form of its parent constellation's Latin name. The original list of Bayer design ...
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
A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, ...
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 may refer to:
Broadcast media
United States
* National Educational Television, the predecessor of the Public Broadcasting Service (PBS) in the United States
* National Empowerment Television, a politically conservative cable TV network ...
'' 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 is an asterism in the constellation of Orion. Other names include the Belt of Orion, the Three Kings, and the Three Sisters. The belt consists of three bright and easily identifiable collinear star systems – Alnitak, Alnilam, ...
* Orion's Sword
References
{{Set index article, astronomical objects
Lists of stars
Orion (constellation)
Orionis, Pi
Orion's Shield