V1073 Orionis is a B9.5 Orion variable that forms an equilateral triangle with θ2 Ori B and C. Bizarrely, θ2 Orionis C has a second entry in the Washington Double Star Catalog under the name S490. Its spectral lines were seen to change position periodically, indicating orbital motion. A new orbital period for 2 Ori A is derived from new and old radial velocities covering the period 1903-1973. catalogues and names: q 2 Ori, NSV 02320, 43 Ori, HR 1897, HD 37041, SAO 132321, WDS 05354-0525A: constellation: Orion Theta 2 Orionis is a more distant grouping of three main stars plus several fainter companions, 1-2 arc-minutes from Theta 1. Nama tradisional bintang ini adalah Mizan Batil II atau Mizan Batil ath Thani, berarti "timbangan kedua yang salah" dalam bahasa Arab.Nama lainnya untuk bintang ini adalah: The presence of a possible change in the period is also investigated. Bernacca, P. L.; Bianchi, L. Abstract. The binary system Theta-2 OriA, physical member of the Ori Ic subgroup of the I Orionis association, falls within the error box of the X-ray source 4U 0531-05, as observed by Uhuru, Ariel V and ANS satellites. The companion is 10th magnitude and actually lies between θ2 Ori B and V1073 Ori.[15]. θ1 Orionis, the well known Trapezium cluster, is only 2 arc minutes away from θ2 Orionis A. [17], θ2 Orionis A also shows unexplained rapidly variable x-ray emission. Notice, Smithsonian Terms of The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative supply is not available. The three stars together have nearly the same mass as the O5.5 θ1 Orionis C and visually are even brighter. θ2 Orionis consists of three stars in a line, each about an arc-minute from the next. The current CoinMarketCap ranking is #29, with a market cap of $665,698,379 USD. A new orbital period for 2 Ori A is derived from new and old radial velocities covering the period 1903-1973. High resolution spectroscopy shows that there is an even closer companion, only about 0.47 AU from the primary, for a total of three stars. Astrophysical Observatory. θ2 Orionis A is itself a triple star system. Theta2 Orionis (θ2 Ori) is a multiple star system in the constellation Orion. Component C is another B class main sequence star, but cooler and less than a thousand times the luminosity of the sun. Summary. There are dozens of much fainter stars in the same field, many of them pre-main-sequence stars still forming from the Orion Molecular Cloud Complex. This helps to explain the high mass and visual luminosity for an O9.5 star at this distance. Theta 1 C is itself a binary of two massive stars, C1 and C2, plus a very close fainter companion apparently escaping the system. Theta2 Orionis (θ 2 Ori) merupakan salah satu bintang di rasi Orion.Bintang ini berada pada jarak 1895 tahun cahaya dan bermagnitudo 4.98.. Etimologi. It has a circulating supply of 1,000,000,000 THETA coins and the max. (or is it just me...), Smithsonian Privacy (or is it just me...), Smithsonian Privacy The presence of a possible change in the period is also investigated. Astrophysical Observatory. The primary component A appears as a 5th magnitude O class subgiant over 100,000 times as luminous as the sun. Despite the names, θ2 Orionis A is marginally brighter than the brightest star in the Trapezium. Copernicus observations of Theta-2 Ori A, a proposed optical counterpart to the X-ray source 4U 0531-05. The x-rays cannot be explained standard mechanisms such as colliding winds or coronal emissions from an unseen companion. Use, Smithsonian θ 2 Ori C: V361 Ori, BD−05°1326, HD 37062, SAO 132329, S 490A, CCDM 05353-0524G: Database references; SIMBAD: data: data2: data3: Theta 2 Orionis (θ 2 Ori) is a multiple star system in the constellation Orion. Both companions are thought to be early A or late B with masses of 7-9 M☉. I. [16], Speckle interferometry has resolved a companion about 0.3" away, around 147 AU. Use, Smithsonian Agreement NNX16AC86A, Is ADS down? In addition to the well-known three stars, the Washington Double Star Catalog confusingly lists a component D which is actually θ1 Orionis C.[15]. Agreement NNX16AC86A, Is ADS down? There is one other star brighter than 10th magnitude in the region. Notice, Smithsonian Terms of The Washington Double Star Catalog", https://en.wikipedia.org/w/index.php?title=Theta2_Orionis&oldid=982476383, Creative Commons Attribution-ShareAlike License, This page was last edited on 8 October 2020, at 11:30. Summary. The spectral type suggests it is evolving away from the main sequence, although it is thought to be less than 2 million years old. The 6th magnitude component B is an early B main sequence star nearly 30,000 K and over 10,000 times the luminosity of the sun. The first orbit was derived in 1924, indicating a period of 21 days. and a rather eccentric orbit. The young O9.5 V spectroscopic binary Theta 2 Ori A shows moderately hard X-ray emission and relatively narrow X-ray lines, suggesting that it may be a Magnetically Confined Wind Shock (MCWS) source, similar to its more massive analogue Theta 1 Ori C. X-ray flares occurring near periastron led to the suggestion that the flares are produced via magnetic reconnection as … THETA price today is $0.665698 USD with a 24-hour trading volume of $30,219,027 USD. It is a few arc minutes from its more famous neighbour the Trapezium Cluster, also known as θ1 Orionis. Key words: radial velocities X-ray sources, The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative [12], Catalog of Components of Double and Multiple Stars, "The 2001 US Naval Observatory Double Star CD-ROM. THETA is down 4.22% in the last 24 hours. Star: Theta 2 Orionis [43 Ori; SI 16; ADS 4188; SAO 132321] Location of site: Northern Kansas City, Missouri (USA) 94d 30m west longitude, 39d 15m north latitude 980 ft above Mean Sea Level Date of observations (UT): 0215 of 12-30-99 Site classification: suburban Sky conditions: An examination of the present observational material indicates that there are no strong objections, at this stage, to Theta-2 OriA as the possible optical counterpart of 4U 0531-05. The Catalog of Components of Double and Multiple Stars includes the stars of θ1 and θ2 Ori within the same system of 13 components. Key words: radial velocities X-ray sources The spectral peculiarities may be related to close companions or could be caused by the extreme youth of the star.
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