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Group of OB stars
An OB association is a loosely organized, gravitationally unbound group of young, massive, main sequence stars primarily of spectral types O and B, characterized
OB_association
Type of hot, massive star
OB stars are hot, massive stars of spectral types O or early-type B that form in loosely organized groups called OB associations. They are short lived
OB_star
Loose star cluster
located; the association type, and, sometimes, a numerical identifier. Victor Ambartsumian first categorized stellar associations into two groups, OB and T,
Stellar_association
Study of the movement of stars
that located a dozen OB associations within 650 parsecs of the Sun. The nearest OB association is the Scorpius–Centaurus association, located about 400
Stellar_kinematics
Nearest OB association to Earth
The Scorpius–Centaurus association (also known as Sco–Cen or Sco OB2) is the closest OB association to the Solar System, composed of three subgroups (Upper
Scorpius–Centaurus association
Scorpius–Centaurus_association
Giant molecular cloud in the Milky Way
regions, ionized by very bright stars, concentrated in the various OB Association found in this area of the sky. Sh2-109 is also the brightest and most
Cygnus Molecular Nebula Complex
Cygnus_Molecular_Nebula_Complex
Star-forming regions in the constellation Cassiopeia
sight is clearer in this direction. Here, some particularly bright OB associations are found, some associated with well-known open clusters such as M103
Star-forming regions of Cassiopeia
Star-forming_regions_of_Cassiopeia
Constellation in the southern celestial hemisphere
likely co-moving B-type members of the Scorpius–Centaurus association, the nearest OB association to the Sun. They are among the highest-mass stellar members
Crux
Binary star in the constellation Scorpius
most evolved stellar member of the Scorpius–Centaurus association, the nearest OB association to the Sun. It is located about 170 parsecs (550 ly) from
Antares
Constellation in the northern celestial hemisphere
Vulpecula contains an OB-association of young stars, called the Vulpecula OB-association or Vul OB1. The association contains nearly 100 OB stars and over 800
Vulpecula
Binary star in the constellation Aquila
star in the constellation Aquila. It is part of the Scorpius-Centaurus OB association, likely belonging to the subgroup Theia 53. The system has a directly
WISPIT_2
Hot giant star group
its relative closeness and complexity it is the most closely studied OB association. The Orion OB1 consists of the following subgroups: Orion OB1a – the
Orion_OB1
Zodiac constellation in the southern celestial hemisphere
longshoreman's hook. Most of them are massive members of the nearest OB association: Scorpius–Centaurus. The star δ Sco, after having been a stable 2.3
Scorpius
Association of Stars in Vulpecula
is an OB association in which a batch of massive stars are being born. It was first identified by W. W. Morgan et al. (1953). The association is located
Vulpecula_OB1
Constellation in the southern celestial hemisphere
of the brightest stars in Lupus are massive members of the nearest OB association, Scorpius–Centaurus. Alpha Lupi is an ageing blue giant star of spectral
Lupus_(constellation)
Cavity hundreds of light years across created by strong stellar winds in a galaxy
spectral types of O and early B, are usually found in groups called OB associations. Massive O stars have strong stellar winds, and most of these stars
Superbubble
Stellar classification
In young stellar associations, most of the light comes from O- and B-type stars, so such associations are called OB associations. The birth of an O-type
O-type_star
Dark nebula in the constellation Camelopardalis
by the presence of a large number of young stellar objects and the OB association catalogued as Camelopardalis OB1, composed of some bright stars of spectral
Camelopardalis_dark_region
Star cluster in the constellation Dorado
NGC 1910, or LH-41, is an OB association in the Large Magellanic Cloud. NGC 1910's right ascension is 5h 18m 42.5s and its declination is -69° 14′ 12.1″
NGC_1910
Star in the constellation Centaurus
Lower Centaurus–Crux sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun. Epsilon Centauri
Epsilon_Centauri
Star-forming regions in the constellation Vela
17 [it], are located. Massive stars in this region form extensive OB associations, designated as Vela R2 and Puppis R2, situated at distances of approximately
Star-forming_regions_of_Vela
Ring of stars in the Milky Way galaxy
regions and OB associations that make up this region include the Orion Nebula and the Orion molecular clouds, the Scorpius–Centaurus OB association, Cepheus
Gould_Belt
Star in the constellation Crux
Scorpius–Centaurus association, which is an OB association of massive stars that share a common origin and motion through space. This is the nearest OB association to
Delta_Crucis
Young sun-like star in the constellation Centaurus
proper motion consistent with that of the Scorpius–Centaurus association, an OB association of young stars with ages between 11–17 million years and distances
V1400_Centauri
Molecular cloud complex in the constellations Vela and Puppis
about 700-1000 parsecs (2300-3300 light years) and are related to the OB association Vela R2, while cloud B is located at a greater distance, up to 2000
Vela_Molecular_Ridge
Molecular cloud complex in the constellation Monoceros
nebulae, illuminated by the hot, blue stars of the Monoceros R2 association, an OB association formed from the same gases it now illuminates; these stars,
Monoceros_R2
Spectroscopic binary in Carina
young age, it is likely to have originated from an OB association. The two nearest known associations to HH Carinae are Car OB1 and Car OB2, which have
HH_Carinae
Barred spiral galaxy in the Local Group
Andromeda Nebula". Lowell Observatory Bulletin. 1 (8): 56–57. Bibcode:1913LowOB...2...56S. "Seite:Allgemeine Naturgeschichte und Theorie des Himmels.djvu/41
Andromeda_Galaxy
Stellar association
Perseus OB1 is an OB association in the Northern Celestial Hemisphere in the constellation Perseus. It is centered on the Double Cluster (NGC 869 and NGC
Perseus_OB1
Binary star system in the constellation Scorpius
Upper Scorpius subgroup of the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. The Upper Scorpius
Delta_Scorpii
Binary star in the constellation Crux
member of the Lower Centaurus–Crux group of the Scorpius–Centaurus OB association of co-moving stars. This is a double-lined spectroscopic binary system
HD_106906
Star in the constellation Ara
system. A scenario that it was ejected from the Scorpius–Centaurus OB association as a result of a past supernova explosion seems unlikely because of
Rho1_Arae
OB association in the constellation Lacerta
collection of faint nebular filaments and young, hot stars grouped into an OB association, known as Lacerta OB1; the system is named after the constellation in
Lacerta_OB1
Medical specialty encompassing two subspecialties
spelled as obstetrics and gynecology; abbreviated as Obst and Gynae, O&G, OB-GYN and OB/GYN) is the medical specialty that encompasses the two subspecialties
Obstetrics_and_gynaecology
Binary star system
approximately 470 light-years away from Earth, in the Upper Scorpius (USco) OB association. The primary star, UScoCTIO 108A, is with a mass of around 0.06 solar
UScoCTIO_108
OB association
Carina OB2 is a giant OB association in the constellation Carina. It contains anywhere from 91 to 157 stars, many of which are hot blue stars of spectral
Carina_OB2
Association football club in Denmark
[ˈoˀðn̩sə ˈpʌlˀtkʰlup]; also known as Odense BK or the more commonly used OB) is a Danish professional football club based in the city of Odense, in southern
Odense_Boldklub
Star in the constellation Musca
Lower Centaurus–Crux sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun. Alpha Muscae has
Alpha_Muscae
OB association in the constellation Scorpius
dozens of high-mass stars grouped into an extensive OB association. The core of the association is easily visible with binoculars and even to the naked
Scorpius_OB1
Star in the constellation Centaurus
Centaurus–Crux (LCC) group of the Scorpius–Centaurus association, which is the nearest OB association to the Sun. This is a loose grouping of stars that
Lambda_Centauri
Large nebula in Constellation Norma
Constellation Norma. RCW 106 is visible in the direction of the R103 OB association and is embedded in a 100 thousand solar mass 28×94 pc2 giant molecular
RCW_106
Variable star in the constellation Centaurus
Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. Anderson, E.; Francis
Mu_Centauri
Star in the constellation Centaurus
constellation Centaurus and a member of the Scorpius–Centaurus association, the nearest OB association to the Sun and the host star of a bright Kuiper belt-like
HD_115600
Open cluster in the constellation Cepheus
only about 7.5 million years old. Markarian 50 may be a member of the OB association Cassiopeia OB2. The Wolf–Rayet star WR 157 is a member of Markarian
Markarian_50
Binary star system in the constellation Centaurus
Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun. In Chinese astronomy
Nu_Centauri
Star in the constellation Ophiuchus
Upper Scorpius sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. The primary component
Theta_Ophiuchi
Candidate luminous variable star in the constellation Dorado
catalog) is a candidate luminous blue variable located in the LH-41 OB association in the Large Magellanic Cloud. R85 has been shown to vary erratically
R85
OB Association in the constellation Cepheus
Cepheus OB1 is an OB association around the cluster NGC 7380. The region is approximately 3,400 parsecs from Earth in the constellation of Cepheus, although
Cepheus_OB1
Stars sorted by absolute magnitude
of 1 million L☉ or greater, including the stars in open clusters, OB associations and H II regions. The majority of stars thought to be more than 1 million
List_of_most_luminous_stars
Dark absorption nebula
(June 1989). "Physical parameters of stars in the Scorpio-Centaurus OB association". Astronomy and Astrophysics. 216: 44. Bibcode:1989A&A...216...44D.
Barnard_68
Star in the constellation Centaurus
Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. In traditional Chinese
Eta_Centauri
Red supergiant star in the constellation Orion
Betelgeuse may instead be a member of the newly discovered Taurion OB association. In the late phase of stellar evolution, massive stars like Betelgeuse
Betelgeuse
Star in the constellation of Lupus
Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. Traditional Chinese
Delta_Lupi
Topics referred to by the same term
excellence of the Air Cadet League of Canada Orion OB1a or Belt of Orion OB association Orion's Belt, the collar of the cat Orion in the film Men in Black "Orion's
Orion's_Belt_(disambiguation)
Star in the constellation of Scorpius
Upper Scorpius subgroup of the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. The Upper Scorpius
Tau_Scorpii
Star in the constellation Ophiuchus
Upper Scorpius sub-group in the Scorpius–Centaurus OB association; the nearest such co-moving association of massive stars to the Sun. This is a massive Be
Chi_Ophiuchi
Star in the constellation Scorpius
Scorpius–Centaurus association in a 2001 article, based on its high lithium content and position in the HR diagram. This is the nearest OB association and recent
K2-33
Open cluster
association. In 1967, the membership list was extended by 28 stars within a 10° radius. O. J. Eggen in 1981 suggested that Cr121 is linked to an OB association
Collinder_121
Binary Star in the Cygnus OB2 association
O-type binary star system located in the Cygnus OB2 association, a young and massive OB association in the constellation of Cygnus. It consists of two
Cygnus_OB2-9
Supernova close enough to affect Earth's biosphere
are expected to occur in active star-forming regions, with 12 such OB associations being located within 650 pc of the Earth. At present, there are up
Near-Earth_supernova
Binary star system in the constellation Scorpius
(150 parsecs). This system is a member of the Scorpius–Centaurus association, the nearest OB association of co-moving stars to the Sun. The primary (Mu1 Scorpii
Mu1_Scorpii
Star system in the constellation Taurus
heliocentric radial velocity of +14.6 km/s, and it is a member of the Taurion OB association, located between Orion and Taurus. It is located 0.7 degree north of
Tau_Tauri
Multiple stellar system in the constellation Scorpius
extinction from interstellar dust. It is a member of the Upper Scorpius OB association. It has two components, designated Rho Scorpii A and B. Rho Scorpii
Rho_Scorpii
Star in the constellation of Scorpius
Scorpius–Centaurus association, the nearest OB association to the Sun. This subgroup is the youngest of the three of the association, with an estimated
HD_142250
Star in the constellation of Scorpius
cluster NGC 6231, the center of the OB association Scorpius OB1; it is not clear whether it is a part of the association or not. With an apparent magnitude
HD_151932
Star in the constellation Centaurus
binary star system. This star may be a member of the Scorpio-Centaurus OB association (Sco OB2). This is one of the nearest regions of recent star formation
J_Centauri
Danish sports club
from 1928 to 1950. ØB was a founding member of the Sports Confederation of Denmark (1896) and the Copenhagen Football Association (1903). The football
Østerbros_Boldklub
Star in the constellation Dorado
binary star system in the LH 54 OB association within the Large Magellanic Cloud in the constellation Dorado. The OB association LH 54 was catalogued by astronomers
LH_54-425
Binary star system in the constellation Centaurus
Lower Centaurus–Crux sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun. The primary component
Rho_Centauri
Massive Binary star system in the Large Magellanic Cloud
system located in the Large Magellanic Cloud (LMC), within the LH 54 OB association. Comprising two massive early-type O stars, an O3 If* supergiant and
MACHO*05:34:41.3−69:31:39
Emission nebula and star-forming region in the constellation Crux
"Spectroscopic Confirmation of the Dragonfish Association: The Galaxy's Most Luminous OB Association". The Astrophysical Journal Letters. 743 (2): L28
Dragonfish_Nebula
Star in the constellation Scorpius
possible member of the Upper Scorpius sub-group in the Scorpius–Centaurus OB association during the 20th century. However, it does not appear in more recent
Omicron_Scorpii
Galaxy in the constellation Horologium
short, 6 arcseconds long, and with several knots. A large cluster or OB association is visible at its western end. Hydrogen line mapping shows a central
IC_1954
Star in the constellation of Scorpius
1999). "The History of Low-Mass Star Formation in the Upper Scorpius OB Association". Astronomical Journal. 117 (5): 2381. Bibcode:1999AJ....117.2381P.
1RXS_J160929.1−210524
Star in the constellation Musca
Lower Centaurus–Crux sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun. van Leeuwen, F
Gamma_Muscae
Danish women's football league season
2025-10-21. "Kristian Mørch stopper i OB". ob.dk (in Danish). 2025-09-09. Retrieved 2025-09-14. "Cheftræner stopper i OB: Familien står i 'livstruende situation'
2024–25_Danish_Women's_League
Danish women's association football team in Odense, Denmark
Odense Boldklub Q (commonly referred to as OB Q) is a Danish women's football team based in Odense, Denmark. OB Q compete in A-Liga, the Danish top-flight
Odense_Boldklub_Q
Open cluster in the constellation Scorpius
cluster, including RCW 121 and RCW 122 at the bottom. Cygnus OB2, an OB association containing many massive stars List of most massive stars Kharchenko
HM_1
Star in the constellation Cepheus
Cepheus. It has a spectral class of O9 and is a member of Cep OB2, an OB association of massive stars located about 615 parsecs (2,010 ly) from the Sun.
19_Cephei
Star in the constellation Lupus
Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. This is a gravitationally unbound stellar association with an
Alpha_Lupi
Star in the constellation Centaurus
Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. Anderson, E.; Francis
Phi_Centauri
Binary star in the constellation Centaurus
Centaurus–Lupus subgroup of the Scorpius–Centaurus association, the nearest OB association to the Sun. This is an association of stars with common origin and movement
HD_129116
OB association in the Andromeda Galaxy
as a star cluster but today, due to its size, it is classified as an OB association. NGC 206 is located in a spiral arm of the Andromeda Galaxy, in a zone
NGC_206
NASA space telescope for exoplanetology (2009–2018)
Formation History among the F-type Members of the Scorpius-Centaurus OB Association". Astrophysical Journal. 746 (2): 154. arXiv:1112.1695. Bibcode:2012ApJ
Kepler_space_telescope
Binary star system in the constellation Columba
6+12.2 −13.8 km/s. It is thought to have been ejected from the OB association Sco OB 1 approximately 14 million years ago. The primary component is a
HD_41534
Star in the constellation Sagittarius
K) with a distance of 2,900±200 pc. WR 102 was likely born from the OB association Sagittarius OB5. It is a very small dense star, with a radius around
WR_102
Magellanic Cloud. IC 4996 is an open cluster in Cygnus OB1. Vela R2 is a OB association in Vela Molecular Ridge. Black holes are the end point of the evolution
List_of_most_massive_stars
Star in the constellation of Scorpius
cluster NGC 6231, the center of the OB association Scorpius OB1; it is not clear whether it is a part of the association or not. With an apparent magnitude
HD_152408
motions of cool and ultracool candidate members in the Upper Scorpius OB association". Astronomy and Astrophysics. 504 (3): 981–990. arXiv:0907.0149. Bibcode:2009A&A
List of stars that have unusual dimming periods
List_of_stars_that_have_unusual_dimming_periods
Star in the constellation Orion
Alves suggested that it is a member of the newly discovered Taurion OB association. This object is a B-type main-sequence star with a stellar classification
69_Orionis
Star in the constellation Lupus
of 27.4±4.9 km/s. It appears to be a member of the Scorpio-Centaurus OB association. This star has the spectrum of a B-type subgiant star with a stellar
Iota_Lupi
Multiple star system in the constellation Aries
slowly pulsating B-type star. This system is a member of the Cas-Tau OB association of stars that share a common motion through space. Anderson, E.; Francis
Tau1_Arietis
Triple star system in the constellation Lupus
Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. Traditional Chinese
Gamma_Lupi
Star in the constellation Lupus
Upper Scorpius sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun. The Upper Scorpius
Chi_Lupi
Nebula in the constellation Serpens
high-mass stars of this region constitute the Serpens OB1 and Serpens OB2 OB association. Serpent's Nebula H II region "SH 2-54". SIMBAD. Centre de données astronomiques
Sh_2-54
Star in the constellation Taurus
240 ly (75 pc) some 9.6 million years ago. It is a member of the Cas-Tau OB association of co-moving stars, and has a peculiar velocity of 8.3 km/s. Grenier
114_Tauri
Planet not gravitationally bound to a star
70 and up to 170 depending on the assumed age. They are found in the OB association between Upper Scorpius and Ophiuchus with masses between 4 and 13 MJ
Rogue_planet
Multiple star system in the constellation of Scorpius
Bajkova, A. T. (September 2007). "Kinematics of the Scorpius-Centaurus OB association". Astronomy Letters. 33 (9): 571–583. arXiv:0708.0943. Bibcode:2007AstL
Sigma_Scorpii
Star in the constellation Aries
about 36 million years old and is a probable member of the Cas-Tau OB association of stars that share a common motion through space. In 2016, a stellar
Sigma_Arietis
Astronomer
galaxy. These stars form in OB associations, which defy typical gravitational bounds. Dr. Garmany was quoted, "an OB association is the closest thing to nothing
Catharine_Garmany
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