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Pi Aquarii, Latinized from π Aquarii, is the Bayer designation for a binary star in the equatorial constellation of Aquarius. This system has an apparent visual magnitude of a mean apparent magnitude of +4.57. [4] Based upon parallax measurements, it is located at a distance of roughly 780 light-years (240 parsecs) from Earth. [1]
Pi1 Ursae Majoris ( Pi1 UMa, π¹ Ursae Majoris, π¹ UMa) is a yellow G-type main sequence dwarf with a mean apparent magnitude of +5.63. It is approximately 46.8 light years from Earth, [1] and is a relatively young star with an age of about 200 million years. [11]
Pi Orionis (π Ori, π Orionis) is a group of fairly widely scattered stars in the constellation Orion that constitute the asterism Orion's Shield or Orion's Bow. [1] They form an exception to the general rule that stars that share the same Bayer designation are close together: π 1 is nearly 9° north of π 6 ( Tau Eridani is an even more ...
Pi Canis Majoris (π Canis Majoris; Latin for 'Greater Dog') is a binary star system in the southern constellation of Canis Major. It is visible to the naked eye, having an apparent visual magnitude of +4.69. Based upon an annual parallax shift of 33.80 mas as seen from Earth, this system is located 96.5 light years from the Sun.
3. Orionis. Pi3 Orionis ( π3 Orionis, abbreviated Pi3 Ori, π3 Ori ), also named Tabit / ˈteɪbɪt /, [11] [12] is a star in the equatorial constellation of Orion. At an apparent visual magnitude of 3.16, [2] it is readily visible to the naked eye and is the brightest star in the lion's hide (or shield) that Orion is holding.
Pi Arietis, Latinized from π Arietis, is the Bayer designation for a multiple star system in the northern constellation of Aries. Based upon parallax measurements made during the Hipparcos mission, this system is approximately 800 light-years (250 parsecs) distant from Earth and has an apparent visual magnitude of 5.21.
Pi Ceti, Latinized from π Ceti, is the Bayer designation for a star system in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 4.238. [2] Observed to have an Earth half yearly parallax shift of 8.30 mas, [1] it is around 393 light years from the Sun .
The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics .