[72] "Jauzah" was a proper name for Orion; an alternative Arabic name was رجل الجبار rijl al-jabbār, "the foot of the great one", from which stems the rarely used variant names Algebar or Elgebar. [87][88][89] The SSM-N-6 Rigel was a cruise missile program for the US Navy that was cancelled in 1953 before reaching deployment. [43], The unusual Hα line profile is observed to vary unpredictably. This is of course not speed as we normally think about it. [31] In those spectral types, the 'e' indicates that it displays emission lines in its spectrum, while the 'p' means it has an unspecified spectral peculiarity. Rigel is believed to have formed around 8 million years ago. [40], Hierarchical scheme for Rigel's components[12]. Nominatur etiam Rigel. It is associated with mass loss where there is simultaneously emission from a dense wind close to the star and absorption from circumstellar material expanding away from the star. The 2007 Hipparcos new reduction of Rigel's parallax is 3.78±0.34 mas, giving a distance of 863 light-years (265 parsecs) with a margin of error of about 9%. [23][30], Rigel is an intrinsic variable star with an apparent magnitude ranging from 0.05 to 0.18. [7], At Rigel's estimated distance, Rigel B's projected separation from Rigel A is over 2,200 astronomical units (AU). A fainter star at a wider separation might be a fifth component of the Rigel system. William Herschel discovered Rigel to be a visual double star on 1 October 1781, cataloguing it as star 33 in the "second class of double stars" in his Catalogue of Double Stars,[18] usually abbreviated to H II 33, or as H 2 33 in the Washington Double Star Catalogue. [39] Variations in the spectrum have resulted in the assignment of different classes to Rigel, such as B8 Ia, B8 Iab, and B8 Iae. Further observations of radial velocity variations indicate that it simultaneously oscillates in at least 19 non-radial modes with periods ranging from about 1.2 to 74 days. Rigel is actually a three star system consisting of the blue supergiant Rigel A and two distant and much dimmer companions. [21] In modern comprehensive catalogs, the whole multiple star system is known as WDS 05145-0812 or CCDM 05145–0812. This spectroscopic binary, together with the close visual component Rigel C, is likely a physical triple-star system,[61] although Rigel C cannot be detected in the spectrum, which is inconsistent with its observed brightness. About a quarter of the time it is a double-peaked line, that is, an absorption line with an emission core or an emission line with an absorption core. This is the principle underlying the theory of Special Relativity. However, the measurements for this object may be unreliable. From the perspective of people on earth, approximately 776 years, seven moths, and five days will pass before the Enterprise arrives home. A triple-star system is separated from Rigel by 9.5 arc seconds. They were given their current name as Rigel was used as an astrofix. [3] Rigel B, usually considered to be physically associated with Rigel and at the same distance, has a Gaia Data Release 2 parallax of 2.9186±0.0761 mas, suggesting a distance around 1,100 light-years (340 parsecs). [5][65] When it was on the main sequence, its effective temperature would have been around 30,000 K.[66] Rigel's complex variability at visual wavelengths is caused by stellar pulsations similar to those of Deneb. Now the time take by the enterprise will be equal to, {eq}v = \frac{d}{t} \rightarrow t = \frac{d}{v} \\ Milli-magnitude variations were observed, and gradual changes in flux suggest the presence of long-period pulsation modes. Coordinates:   05h 14m 32.272s, −08° 12′ 05.91″. [32] It contrasts strongly with reddish Betelgeuse. [68] An older measurement of the angular diameter gives 2.75±0.01 mas,[69] equivalent to a radius of 78.9 R☉ at 264 pc. [52] It is estimated that Rigel has lost about three solar masses (M☉) since beginning life as a star of 24±3 M☉ seven to nine million years ago. Due to its brightness and its recognizable name, Rigel is also a popular fixture in science fiction. Rigel varies slightly in brightness, its apparent magnitude ranging from 0.05 to 0.18. By Mr. Herschel, F. R. S. Communicated by Dr. Watson, Jun", Philosophical Transactions of the Royal Society of London, Centre de données astronomiques de Strasbourg, Commonwealth Scientific and Industrial Research Organisation, "The inhomogeneous circumstellar envelope of Rigel (β Orionis A)", "A systematic study of variability among OB-stars based on HIPPARCOS photometry", Journal of Astronomical History & Heritage, "Yowatashi Boshi; Stars that Pass in the Night", NASA Astronomy Picture of the Day: Rigel and the Witch Head Nebula (15 January 2018), NASA Astronomy Picture of the Day: A Blazing Fireball between the Orion Nebula and Rigel (16 November 2015), December double star of the month – beta Orionis, https://en.wikipedia.org/w/index.php?title=Rigel&oldid=981497208, Creative Commons Attribution-ShareAlike License, This page was last edited on 2 October 2020, at 17:39.

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