Orion (constellation)

constellation straddling the celestial equator

Betelgeuse is a red supergiant star in the equatorial constellation of Orion. It is usually the tenth-brightest star in the night sky and, after Rigel, the second brightest in its constellation. It is a distinctly reddish, semiregular variable star whose apparent magnitude, varying between +0.0 and +1.6, with a main period near 400 days, has the widest range displayed by any first-magnitude star. Betelgeuse is the brightest star in the night sky at near-infrared wavelengths. Its Bayer designation is ', Latinised to Alpha Orionis and abbreviated Alpha Ori or '.

Rigel is a blue supergiant star in the equatorial constellation of Orion. It has the Bayer designation β Orionis, which is Latinized to Beta Orionis and abbreviated Beta Ori or β Ori. Rigel is the brightest and most massive componentand the eponymof a star system of at least four stars that appear as a single blue-white point of light to the naked eye. This system is located at a distance of approximately .

diffuse nebula

asterism

Reflection nebula in the constellation Orion

Bellatrix is the third-brightest star in the constellation of Orion, positioned 5° west of the red supergiant Betelgeuse (Alpha Orionis). It has the Bayer designation γ Orionis, which is Latinized to Gamma Orionis. With a slightly variable magnitude of around 1.6, it is typically the 25th-brightest star in the night sky. It is the closest major star in Orion at only 244.6 light-years from the Solar System.

Nebula and H II region in the constellation Orion

dark nebula in the constellation Orion

Alnitak is a triple star system in the constellation of Orion. It has the designations ζ Orionis, which is Latinised to Zeta Orionis and abbreviated Zeta Ori or ζ Ori, and 50 Orionis, abbreviated 50 Ori. The system is located at a distance of several hundred parsecs from the Sun and is one of the three main stars of Orion's Belt along with Alnilam and Mintaka.

Alnilam is the central star of Orion's Belt in the equatorial constellation of Orion. It has the Bayer designation ε Orionis, which is Latinised to Epsilon Orionis and abbreviated Epsilon Ori or ε Ori. This is a massive, blue supergiant star some 1,250 light-years distant. It is estimated to be 270,000 times as luminous as the Sun, and 28 times as massive.

emission nebula in the constellation Orion

Mintaka , designation Delta Orionis (δ Orionis, abbreviated Delta Ori, δ Ori) and 34 Orionis (34 Ori), is a quintuple star system some 1,200 light-years from the Sun in the constellation of Orion. Together with Alnitak (Zeta Orionis) and Alnilam (Epsilon Orionis), the three stars form Orion's Belt, known by many names among ancient cultures. The star is located very close to the celestial equator. When Orion is near the meridian, Mintaka is the rightmost of the Belt's stars when viewed from the Northern Hemisphere facing south.

reflection nebula in the constellation Eridanus

reflection nebula in the constellation Orion

Saiph , designation Kappa Orionis (κ Orionis, abbreviated Kappa Ori, κ Ori) and 53 Orionis (53 Ori), is a blue supergiant star and the sixth-brightest star in the constellation of Orion. Of the four bright stars that compose Orion's main quadrangle, it is the star at the south-eastern corner. A northern-hemisphere observer facing south would see it at the lower left of Orion, and a southern-hemisphere observer facing north would see it at the upper right. Parallax measurements yield an estimated distance of from the Sun. It is smaller, less luminous but hotter at its surface than Rigel with an

Open cluster in the constellation Orion

star in the constellation Orion

H II emission nebula in the constellation Orion

planetary nebula in the constellation Orion

open cluster in Orion

galaxy

reflection nebula in the constellation Orion

Open cluster in the constellation Orion

galaxy

reflection nebula

Meissa , designated Lambda Orionis (λ Orionis, abbreviated Lambda Ori, λ Ori) is a star in the constellation of Orion. It is a multiple star approximately away with a combined apparent magnitude of 3.33. The main components are an O9 giant star and a B-class main sequence star, separated by about 4″. Despite Meissa being more luminous and only slightly further away than Rigel, it appears 3 magnitudes dimmer at visual wavelengths, with much of its radiation emitted in the ultraviolet due to its high temperature.

reflection nebula

open cluster in the constellation Orion

galaxy

galaxy

galaxy

galaxy

galaxy

galaxy

open cluster

asterism in the constellations Orion and Taurus

open cluster in the constellation Orion

open cluster in Orion

reflection nebula

reflection nebula

Wikimedia list article

open cluster of star

large group of bright nebulae, dark clouds, and young stars

first gamma-ray burst for which an afterglow was observed

star in the constellation Orion

five-star system in the constellation Orion

star in the constellation Orion

emission nebula in the constellation Orion

variable star in the constellation Orion

star in the constellation Orion

variable star in the constellation Orion

Mṛgaśirā (also spelled Mr̥gaśīrṣa; Devanagari: मृगशीर्ष) is the 5th nakṣatra or lunar mansion as used in Hindu astronomy and astrology, in the constellation Orion. It corresponds to the stars λ, φ1, and φ2 Orionis. Its position is described in the Surya Siddhānta.

spectroscopic binary star system in the constellation Orion

asterism in the constellation Orion

nearest star in the constellation Orion

star system in the constellation Orion,

quadruple star system in the constellation Orion

variable star in the constellation Orion

variable star in the constellation Orion