Anker - Nebula Vega Portable Projector

Product Information

Vega was one of the stars used to define the magnitude scale, so it has an apparent magnitude around 0 (+0.026). The star is about 40 times brighter than the Sun, but because it's 25 light-years away, it seems dimmer. If the Sun was viewed from Vega, in contrast, its magnitude would only be a faint 4.3.

By 2005, the Spitzer Space Telescope had produced high-resolution infrared images of the dust around Vega. It was shown to extend out to 43″ ( 330AU) at a wavelength of 24μm, 70″ ( 543AU) at 70μm and 105″ ( 815AU) at 160μm. These much wider disks were found to be circular and free of clumps, with dust particles ranging from 1– 50μm in size. The estimated total mass of this dust is 3 ×10 −3 times the mass of the Earth (around 7.5 times more massive than the asteroid belt). Production of the dust would require collisions between asteroids in a population corresponding to the Kuiper Belt around the Sun. Thus the dust is more likely created by a debris disk around Vega, rather than from a protoplanetary disk as was earlier thought. [23] Artist's concept of a recent massive collision of dwarf planet-sized objects that may have contributed to the dust ring around VegaAlthough a planet has yet to be directly observed around Vega, the presence of a planetary system cannot yet be ruled out. Thus there could be smaller, terrestrial planets orbiting closer to the star. The inclination of planetary orbits around Vega is likely to be closely aligned to the equatorial plane of this star. [101] The unusually low metallicity of Vega makes it a weak Lambda Boötis star. [76] [77] However, the reason for the existence of such chemically peculiar, spectral class A0–F0 stars remains unclear. One possibility is that the chemical peculiarity may be the result of diffusion or mass loss, although stellar models show that this would normally only occur near the end of a star's hydrogen-burning lifespan. Another possibility is that the star formed from an interstellar medium of gas and dust that was unusually metal-poor. [78]

Lyrae ( Latinised to Alpha Lyrae) is the star's Bayer designation. The traditional name Vega (earlier Wega [15]) comes from a loose transliteration of the Arabic word wāqi' ( Arabic: واقع) meaning "falling" or "landing", via the phrase an-nasr al-wāqi' ( Arabic: النّسر الْواقع), "the falling eagle". [26] In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN) [27] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 [28] included a table of the first two batches of names approved by the WGSN; which included Vega for this star. It is now so entered in the IAU Catalog of Star Names. [29] Observation [ edit ] The Summer Triangle Vega has been extensively studied by astronomers, leading it to be termed "arguably the next most important star in the sky after the Sun". [18] Vega was the northern pole star around 12,000 BCE and will be so again around the year 13,727, when its declination will be +86°14′. [19] Vega was the first star other than the Sun to have its image and spectrum photographed. [20] [21] It was one of the first stars whose distance was estimated through parallax measurements. Vega has functioned as the baseline for calibrating the photometric brightness scale and was one of the stars used to define the zero point for the UBV photometric system. In Chinese, 織女 ( Zhī Nǚ), meaning Weaving Girl (asterism), refers to an asterism consisting of Vega, ε Lyrae and ζ 1 Lyrae. [110] Consequently, the Chinese name for Vega is 織女一 ( Zhī Nǚ yī, English: the First Star of Weaving Girl). [111] In Chinese mythology, there is a love story of Qixi ( 七夕) in which Niulang ( 牛郎, Altair) and his two children ( β Aquilae and γ Aquilae) are separated from their mother Zhinü ( 織女, lit. "weaver girl", Vega) who is on the far side of the river, the Milky Way. [112] However, one day per year on the seventh day of the seventh month of the Chinese lunisolar calendar, magpies make a bridge so that Niulang and Zhinü can be together again for a brief encounter. The Japanese Tanabata festival, in which Vega is known as Orihime (織姫), is also based on this legend. [113] The brightness of a star, as seen from Earth, is measured with a standardized, logarithmic scale. This apparent magnitude is a numerical value that decreases in value with increasing brightness of the star. The faintest stars visible to the unaided eye are sixth magnitude, while the brightest in the night sky, Sirius, is of magnitude −1.46. To standardize the magnitude scale, astronomers chose Vega and several similar stars and averaged their brightness to represent magnitude zero at all wavelengths. Thus, for many years, Vega was used as a baseline for the calibration of absolute photometric brightness scales. [45] However, this is no longer the case, as the apparent magnitude zero point is now commonly defined in terms of a particular numerically specified flux. This approach is more convenient for astronomers, since Vega is not always available for calibration and varies in brightness. [46] Based on observations of more infrared radiation than expected, Vega appears to have a circumstellar disk of dust. This dust is likely to be the result of collisions between objects in an orbiting debris disk, which is analogous to the Kuiper belt in the Solar System. [23] Stars that display an infrared excess due to dust emission are termed Vega-like stars. [24] In 2021, a candidate ultra-hot Neptune on a 2.43-day orbit around Vega was discovered with the radial velocity method, additionally, another possible Saturn-mass signal with a period of about 200 days. [25] Nomenclature [ edit ] Vega is the brightest star in the constellation of Lyra.From Cox, Arthur N., ed. (1999). Allen's Astrophysical Qualities (4thed.). New York: Springer-Verlag. p.382. ISBN 978-0-387-98746-0. : The pole of Vega—its axis of rotation—is inclined no more than five degrees from the line-of-sight to the Earth. At the high end of estimates for the rotation velocity for Vega is 236.2 ±3.7km/s [11] along the equator, much higher than the observed (i.e. projected) rotational velocity because Vega is seen almost pole-on. This is 88% of the speed that would cause the star to start breaking up from centrifugal effects. [11] This rapid rotation of Vega produces a pronounced equatorial bulge, so the radius of the equator is 19% larger than the polar radius. (The estimated polar radius of this star is 2.362 ±0.012 solar radii, while the equatorial radius is 2.818 ±0.013 solar radii. [11]) From the Earth, this bulge is being viewed from the direction of its pole, producing the overly large radius estimate. The observed helium to hydrogen ratio in Vega is 0.030 ±0.005, which is about 40% lower than the Sun. This may be caused by the disappearance of a helium convection zone near the surface. Energy transfer is instead performed by the radiative process, which may be causing an abundance anomaly through diffusion. [79] Kinematics [ edit ] It’s important to note that when shopping for gadgets and technology products, it can be tempting to go for the lowest price possible. However, be wary of retailers that offer prices that seem too good to be true. Some less reputable retailers may sell counterfeit or low-quality products, which can be dangerous and not perform as well as the genuine product.

The indigenous Boorong people of northwestern Victoria, Australia, named it as Neilloan, [115] "the flying loan". [116] In the Srimad Bhagavatam, Shri Krishna tells Arjuna, that among the Nakshatras he is Abhijit, which remark indicates the auspiciousness of this Nakshatra. [117] Each night the positions of the stars appear to change as the Earth rotates. However, when a star is located along the Earth's axis of rotation, it will remain in the same position and thus is called a pole star. The direction of the Earth's axis of rotation gradually changes over time in a process known as the precession of the equinoxes. A complete precession cycle requires 25,770years, [32] during which time the pole of the Earth's rotation follows a circular path across the celestial sphere that passes near several prominent stars. At present the pole star is Polaris, but around 12,000 BCE the pole was pointed only five degrees away from Vega. Through precession, the pole will again pass near Vega around 14,000 CE. [33] Vega is the brightest of the successive northern pole stars. [15] In 210,000 years, Vega will become the brightest star in the night sky, [34] and will peak in brightness in 290,000 years with an apparent magnitude of –0.81. [34] See: Matteucci, Francesca (2001). The Chemical Evolution of the Galaxy. Astrophysics and Space Science Library. Vol.253. Springer Science & Business Media. p.7. ISBN 978-0792365525. The polar temperature is around 2,000 K higher than at the equator due to the rapid rotation of Vega

In Zoroastrianism, Vega was sometimes associated with Vanant, a minor divinity whose name means "conqueror". [114] As Vega had long been used as a standard star for calibrating telescopes, the discovery that it is rapidly rotating may challenge some of the underlying assumptions that were based on it being spherically symmetric. With the viewing angle and rotation rate of Vega now better known, this will allow improved instrument calibrations. [74] Element abundance [ edit ] Vega is the brightest star in the northern constellation of Lyra. It has the Bayer designation α Lyrae, which is Latinised to Alpha Lyrae and abbreviated Alpha Lyr or α Lyr. This star is relatively close at only 25 light-years (7.7 parsecs) from the Sun, and one of the most luminous stars in the Sun's neighborhood. It is the fifth-brightest star in the night sky, and the second-brightest star in the northern celestial hemisphere, after Arcturus. From the perspective of an observer on a hypothetical planet around Vega, the Sun would appear as a faint 4.3-magnitude star in the Columba constellation. [note 5]

At this time, no planet has been definitively identified orbiting Vega, but its possible terrestrial planets could orbit near the star, probably in its equatorial plane.

Determining the nature of the planet has not been straightforward; a 2002 paper hypothesizes that the clumps are caused by a roughly Jupiter-mass planet on an eccentric orbit. Dust would collect in orbits that have mean-motion resonances with this planet—where their orbital periods form integer fractions with the period of the planet—producing the resulting clumpiness. [94] Artist's impression of a planet around Vega With Vega's built-in rechargeable battery, you can recreate the sights and sounds of the cinema anywhere you want. Get up to 3 hours of power on a single charge, more than enough to have a good binge of your favourite TV series. Vega is seen in the summer sky in the Northern Hemisphere, where it is part of the constellation Lyra. The " Summer Triangle" consists of the bright stars Vega, Deneb, and Altair. Vega is at the top of the triangle, with Deneb below it and to the left and Altair below both stars and to the right. Vega forms a right angle between the two other stars. All three stars are extremely bright in a region with few other bright stars. In 2021, a paper analyzing 10 years of spectra of Vega detected a candidate 2.43-day signal around Vega, statistically estimated to have only a 1% chance of being a false positive. [25] Considering the amplitude of the signal, the authors estimated a minimum mass of 21.9 ±5.1 Earth masses, but considering the very oblique rotation of Vega itself of only 6.2° from Earth's perspective, the planet may be aligned to this plane as well, giving it an actual mass of 203 ±47 Earth masses. [25] The researchers also detected a faint 196.4 +1.6