Iota Orionis (ι Orionis, abbreviated ι Ori) is a multiple star system in the equatorial constellation of Orion the hunter. It is the eighth-brightest...

the constellation Orion. It comprises three stars (42 Orionis, Theta Orionis, and Iota Orionis) and M42, the Orion Nebula, which together are thought...

star Eta Orionis. Orion's Sword contains the Orion Nebula, the Messier 43 nebula, the Running Man Nebula, and the stars Theta Orionis, Iota Orionis, and 42...

at near-infrared wavelengths. Its Bayer designation is α Orionis, Latinised to Alpha Orionis and abbreviated Alpha Ori or α Ori. With a radius between...

apparent size is 14 × 14 arc minutes and it is located around the star Iota Orionis on the southern tip of the Orion constellation. Herschel made his first...

Beta Cephei variable. Located south of Iota Orionis, Upsilon Orionis is one of two stars (the other is 29 Orionis) marking the top of Orion's right boot...

4 visibly bright O-type stars are Gamma Velorum, Alnitak (Zeta Orionis), Mintaka (Delta Orionis), and Zeta Puppis. The corona present in other spectral types...

split luminosity classes for the O9s. The two MKK O9 V standards were Iota Orionis and 10 Lacertae. The revised Yerkes standards ("MK") presented listed...

Triple star system 2.77 2.76 Beta Herculis Binary star system 2.77 2.76 Iota Orionis Quadruple star system 2.79 2.72 Beta Eridani Star 2.79 2.76 Cor Caroli...

velocity of over 200 km/s. Their common point of origin intersects with Iota Orionis in the Trapezium cluster, some two and half million years in the past...

(September 2000). "Coordinated monitoring of the eccentric O-star binary Iota Orionis: optical spectroscopy and photometry". Monthly Notices of the Royal Astronomical...

et al. (2000). "Coordinated monitoring of the eccentric O-star binary Iota Orionis: Optical spectroscopy and photometry". Monthly Notices of the Royal Astronomical...

Jean (2000). "Coordinated monitoring of the eccentric O-star binary Iota Orionis: Optical spectroscopy and photometry". Monthly Notices of the Royal Astronomical...

Mintaka A (Delta Orionis, 34 Orionis) 1,200 3 O9.5II 2.5 Alnitak (Zeta Orionis, 50 Orionis) 1,260 ± 180 3 O9.5Iab 1.77 Sigma Orionis A 1263±4.3 2 O9.5V...

Trapezium cluster in the Orion Nebula two million years ago. The binary Iota Orionis may have been the other half of this collision. AE Aur is seen to light...

circumstellar disc. GW Orionis B and the third member of the system, GW Orionis C, were detected directly in 2011 using the IOTA interferometer located...

Belt and Sword of Orion. The end of the handle is at ι Orionis, with the far rim at η Orionis.[citation needed] The four central stars in Hercules, Epsilon...

define the system, are considered to be 78 Ursae Majoris (F2 V) and Pi3 Orionis (F6 V). In addition to those two standards, Morgan & Keenan (1973) considered...

reaching its closest alignment with the northern celestial pole around 4200 AD. Iota Cephei and Beta Cephei will stand on either side of the northern celestial...

Hilditch, R. W.; et al. (February 1991). "The eccentric-orbit binaries Iota Orionis and HD 1952: a cautionary tale". The Observatory. 111: 14–20. Bibcode:1991Obs...

Iota Herculis (ι Herculis, ι Her) is a fourth-magnitude variable star system in the constellation Hercules, consisting of at least four stars all about...

a mere 300,000 years old composed of two pre-main-sequence stars—a FU Orionis star and a Herbig Ae/Be star, which has brightened episodically by two...

Carinae (Miaplacidus) 113.2 ± 0.4 1 A1 III +1.69 Phi2 Orionis 113.8 ± 0.7 1 G8 III-IV +4.081 Iota Cephei 115 1 K0III Zeta Pictoris 116.5 ± 1.0 1 F6 IV...

297, been found to have a dusty disk surrounding it, and is also a UX Orionis star, meaning that it shows irregular variations in its brightness. The...

D. A.; Ohnaka, K.; Driebe, T.; Scholz, M. (2007). "The Mira variable S Orionis: Relationships between the photosphere, molecular layer, dust shell, and...

examples include Polaris, Alpha Leporis, Alpha Persei, Delta Canis Majoris and Iota¹ Scorpii. Many of them are variable stars, mostly pulsating Cepheids such...

Precision Optical Interferometer, the Infrared Spatial Interferometer and the IOTA array. A number of other interferometers have made closure phase measurements...

(1981). "The near ultraviolet stellar spectra of alpha Lyrae and beta Orionis". Monthly Notices of the Royal Astronomical Society. 197: 57–74. Bibcode:1981MNRAS...

String of Pearls النظم النَّظْم Epsilon Orionis Alnitak an-Niṭāq the Girdle (Orion's Belt) النطاق النِّطَاق Zeta Orionis Alphard al-Fard the Solitary one الفرد...

quantum mechanics. Spectral standards: B0V – Upsilon Orionis B0Ia – Alnilam B2Ia – Chi2 Orionis B2Ib – 9 Cephei B3V – Eta Ursae Majoris B3V – Eta Aurigae...