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Lacaille 9352

Lacaille 9352(专名或术语)

Lacaille 9352 is located about 10.7 light-years (ly) from our Sun, Sol, in the southwestern edge (23:05:42.04-35:51:11.06, ICRS 2000.0) of Constellation Piscis Australis (or Austrinus), the Southern Fish, near Constellation Grus, the Crane -- southeast of Beta Piscis Australis/Austrini and southwest of Gamma and Delta Piscis Australis/Austrini. It was listed by the Abbé [Abbot] Nicholas Louis de La Caille (1713-1762), who had the great honor of naming 15 of the 88 constellations by becoming the first astronomer to systematically observe the entire night sky, in his posthumously published 1763 catalogue of 9,766 stars that was compiled from 1750 to 1754 by studying the stars of the southern hemisphere at the Cape of Good Hope, the southernmost point of Africa, with just an half-inch (8x) refractor. The star is too faint to be seen with the naked eye.(Solstation)

Lacaille 9352位于太阳(Sol)约10.7光年(ly)之外,在南鱼座(或Austrinus)西南边缘(坐标23:05:42.04-35:51:11.06,ICRS 2000.0)附近,靠近天琴座,位于南鱼座Beta Piscis Australis/Austrini以东,Gamma和Delta Piscis Australis/Austrini以西。该星被Abbé [Abbot] Nicholas Louis de La Caille(1713-1762)列入,他是第一个系统观测整个夜空的天文学家,他荣幸地为88个星座中的15个命名。他在1763年发表的星表中列出了9,766颗恒星,该星表于1750年至1754年间编纂,基于在非洲最南端的好望角,仅使用一个半英寸(8倍)折射望远镜观测南半球的恒星。该星太暗,无法用肉眼看到。

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Lacaille 8760

拉卡耶8760

Also known as AX Microscopii, Lacaille 8760 is located about 12.9 light-years (ly) from our Sun, Sol, in the south central part (21:17:15.3-38:52:2.5, ICRS 2000.0) of Constellation Microscopium, the Microscope -- south of Alpha Microscopii, southwest of Gamma Microscopii, northwest of Theta1 Microscopii, and north of Zeta and Alpha Indi (The Persian). It was listed by the Abbé [Abbot] Nicholas Louis de La Caille (1713-1762), who had the great honor of naming 15 of the 88 constellations by becoming the first astronomer to systematically observe the entire night sky, in his posthumously published 1763 catalogue of 9,766 stars that was compiled from 1750 to 1754 by studying the stars of the southern hemisphere at the Cape of Good Hope, the southernmost point of Africa, with just an half-inch (8x) refractor. Although Lacaille 8760 is the brightest red (more orange-red to some astronomers) dwarf star in Earth's night sky, the star is too faint to be seen with the naked eye by most Humans (Kenneth Croswell, 2002).

也被称为AX Microscopii,Lacaille 8760位于太阳(Sol)约12.9光年(ly)之外,在Microscopium星座的南中央部分(赤道坐标21:17:15.3-38:52:2.5,ICRS 2000.0),位于Alpha Microscopii以南,Gamma Microscopii西南,Theta1 Microscopii西北,以及Zeta和Alpha Indi(The Persian)以北。该星由Abbe [Abbot] Nicholas Louis de La Caille(1713-1762)命名,他是第一个系统观测整个夜空的天文学家,他生前发表了1763年的9766颗恒星目录,该目录从1750年至1754年编纂,基于在非洲最南端的好望角观测的南半球恒星,仅使用半英寸(8倍)折射望远镜。尽管Lacaille 8760是地球夜空中最亮的红矮星(对一些天文学家来说更偏橙红色),但该星太暗,无法被大多数人类肉眼看到(Kenneth Croswell, 2002)。

This spectral and luminosity type of this cool and dim, main sequence dwarf has been classed as orange as K7 (SIMBAD) and red as M2 Ve (Hawley et al, 1996). Lacaille 8760 may have around 60 percent of Sol's mass (RECONS), about 66 to 72 percent of its diameter ((Pasinetti-Fracassini et al, 2001; Johnson and Wright, 1983, page 699; and Claude H. Lacy, 1977, page 482), and 2.8 to 3.5 percent of its luminosity, and is at least half as abundant in elements heavier than hydrogen ("metallicity") as Sol. A relatively mild flare star (that erupts less than once per day), Lacaille 8760 has been given the Variable Star designation AX Microscopii (B.R. Pettersen; P.B. Byrne; and Woolley et al, 1970). Given its relatively sedate flare rate and the high eccentricity (e= 0.20) and inclination (i= 0.06) of its orbit around the galactic center (Allen and Herrera, 1998; P.B. Byrne; and Woolley et al, 1970), the star appears to be older than Sol's 4.6 billion years.(Solstation)

这种冷而暗的主序星矮星的光谱和光度类型已被分类为橙色K7型(SIMBAD)和红色M2 Ve型(Hawley等,1996)。Lacaille 8760的质量约为太阳的60%(RECONS),直径约为太阳的66至72%(Pasinetti-Fracassini等,2001;Johnson和Wright,1983,第699页;以及Claude H. Lacy,1977,第482页),其光度仅为太阳的2.8至3.5%,并且其重元素(比氢重的元素)的丰度至少是太阳的两倍。作为一种相对温和的耀斑星(每天爆发少于一次),Lacaille 8760被赋予了变星编号AX Microscopii(B.R. Pettersen;P.B. Byrne;和Woolley等,1970)。鉴于其相对稳定的耀斑频率以及其围绕银河中心轨道的高偏心率(e=0.20)和倾角(i=0.06)(Allen和Herrera,1998;P.B. Byrne;和Woolley等,1970),该星似乎比太阳的46亿年要古老。

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Luyten 789-6

Luyten 789-6(专名或术语)

The system known as Luyten 789-6 is a nearby triple star system (trinary), also known as EZ Aquarii, consisting of three red dwarfs. It lies 11.08 light-years (3.4 pc) away in the constellation Aquarius. The main component is also a spectroscopic binary. The system's nearest neighbour is Lacaille 9352 at a distance of 4.21 light-years (1.29 pc).

Luyten 789-6 这个系统是一个邻近的三合星系统(三合星),也称为天琴座的 EZ Aquarii,由三颗红矮星组成。它位于天琴座,距离地球 11.08 光年(3.4 pc)。主星本身也是一个光谱二合星。该系统的最近邻是 Lacaille 9352,距离为 4.21 光年(1.29 pc)。
  • Visual magnitude 12.66 (A) 13.67 (B)
    视星等 12.66 (A) 13.67 (B)
  • Absolute magnitude 14.68 (combined)
    绝对星等 14.68(综合值)
  • Spectral type M5V
    M5V型光谱类型
  • Distance 11.26 light-years (3.45 pc)
    距离11.26光年(3.45 pc)
  • Radial velocity -59.9 km/s
    径向速度 -59.9 km/s
  • Position R.A. 22h 38m 33.4s, Dec. -15° 18' 07"
    位置 R.A. 22h 38m 33.4s,Dec. -15° 18' 07"

Sources:

  • http://www.daviddarling.info/encyclopedia/L/Luyten_789-6.html

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Epsilon Indi

Epsilon Indi(专名或术语)

This star system is located about 11.8 light-years (ly) away from our Sun at the northwestern edge (22:03:21.66-56:47:09.51, ICRS 2000.0) of Constellation Indus, the Indian -- southeast of Delta Indi and northwest of Alpha Tucanae. The fifth brightest star in Indus, this star is the title member of the Epsilon Indi stellar moving group. Although smaller and dimmer than the Sun, it is clearly visible with the naked eye. Epsilon Indi has such a high proper motion that, within a few thousand years, it will have moved out of Constellation Indus constellation and into neighboring Constellation Tucana, the Toucan. (Solstation) It moves a full lunar diameter in less than 400 years.(ESO)

这个恒星系统位于太阳系以北西边缘(坐标22:03:21.66-56:47:09.51,ICRS 2000.0)的印度星座(Indus)中,距离太阳约11.8光年。作为印度星座中第五亮的恒星,它是Epsilon Indi恒星运动团的成员。尽管比太阳小且暗,但它仍可以用肉眼看到。Epsilon Indi具有很高的自行运动,因此在几千年内将离开印度星座,进入相邻的Tucana星座( Toucan)。(Solstation)它在不到400年内会移动一个满月直径的距离。(ESO)

Epsilon Indi is a orange-red main sequence dwarf star of spectral and luminosity type K4-5 Ve. The star has about 77 percent of Sol's mass (RECONS), 76 percent of its diameter (Johnson and Wright, 1983, page 701), and about 14.7 percent of its luminosity. It appears to be about 59 to 110 percent as enriched as Sol with elements heavier than hydrogen ("metallicity"), based on its abundance of iron.(Solstation)

天琴座ε是一颗光谱型和光度型为K4-5 Ve的橙红色主序矮星。该星的质量约为太阳的77%(RECONS),直径约为太阳的76%(Johnson和Wright,1983,第701页),其光度约为太阳的14.7%。根据其铁的丰度,它似乎比太阳富集了59%到110%的重元素(“金属度”)。(Solstation)

On January 13, 2003, astronomers announced the discovery of a methane brown dwarf companion to this nearby star In August 2003, the same team (as well as another team) of astronomers discovered that the brown dwarf had its own brown dwarf companion. As of late 2003, the two substellar objects are the closest known brown dwarfs to the Solar System.(Solstation) Epsilon Indi B has a mass just 45 times that of Jupiter, the largest planet in the Solar System, and a surface temperature of only 1000 ¡C. It belongs to the so-called 'T dwarf' category of objects which straddle the domain between stars and giant planets.(ESO)

2003年1月13日,天文学家宣布发现了一颗甲烷棕矮星伴星,围绕这颗邻近的恒星。2003年8月,同一研究团队(以及另一团队)发现这颗棕矮星本身也拥有一颗伴星。截至2003年底,这两颗亚恒星天体是已知距离太阳系最近的棕矮星。Epsilon Indi B的质量仅为木星的45倍,木星是太阳系中最大的行星,其表面温度仅为1000摄氏度。它属于所谓的‘T型棕矮星’类别,这类天体介于恒星和巨型行星之间。

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