Anker - Nebula Vega Portable Projector

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Vega has a rotation period of 12.5 hours, [14] much faster than the Sun's rotational period but similar to, and slightly slower than, those of Jupiter and Saturn. Because of that, Vega is significantly oblate like those two planets.

In Zoroastrianism, Vega was sometimes associated with Vanant, a minor divinity whose name means "conqueror". [114] 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. Although Vega and the Sun are both stars, they are very different from one another. While the Sun appears round, Vega is noticeably flattened. This is because Vegas has over twice the mass of the Sun and is spinning so rapidly (236.2 km/s at its equator), that it experiences centrifugal effects. If it were spinning about 10% faster, it would break apart! The equator of Vega is 19% bigger than its polar radius. Because of the star's orientation with respect to Earth, the bulge appears unusually pronounced. If Vega was viewed from above one of its poles, it would appear round. 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] From Cox, Arthur N., ed. (1999). Allen's Astrophysical Qualities (4thed.). New York: Springer-Verlag. p.382. ISBN 978-0-387-98746-0. :

Nebula Vega portable EU+UK Projector

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. Among the northern Polynesian people, Vega was known as whetu o te tau, the year star. For a period of history it marked the start of their new year when the ground would be prepared for planting. Eventually this function became denoted by the Pleiades. [109] The local surface gravity at the poles is greater than at the equator, which produces a variation in effective temperature over the star: the polar temperature is near 10,000 K, while the equatorial temperature is about 8,152K. [11] This large temperature difference between the poles and the equator produces a strong gravity darkening effect. As viewed from the poles, this results in a darker (lower-intensity) limb than would normally be expected for a spherically symmetric star. The temperature gradient may also mean that Vega has a convection zone around the equator, [12] [72] while the remainder of the atmosphere is likely to be in almost pure radiative equilibrium. [73] By the Von Zeipel theorem, the local luminosity is higher at the poles. As a result, if Vega were viewed along the plane of its equator instead of almost pole-on, then its overall brightness would be lower.

Hear every whisper, explosion, and song with great clarity with Dolby Digital Plus sound through the Vega's dual 4W speakers. The Vega can even be used as a portable wireless speaker thanks to built-in Bluetooth. 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. Most of the energy produced at Vega's core is generated by the carbon–nitrogen–oxygen cycle ( CNO cycle), a nuclear fusion process that combines protons to form helium nuclei through intermediary nuclei of carbon, nitrogen and oxygen. This process becomes dominant at a temperature of about 17millionK, [59] which is slightly higher than the core temperature of the Sun, but is less efficient than the Sun's proton–proton chain fusion reaction. The CNO cycle is highly temperature sensitive, which results in a convection zone about the core [60] that evenly distributes the 'ash' from the fusion reaction within the core region. The overlying atmosphere is in radiative equilibrium. This is in contrast to the Sun, which has a radiation zone centered on the core with an overlying convection zone. [61]

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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 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] There are free phone apps that you can use to seek Vega by name or by its location. Many allow you to wave the phone across the sky until you see the name. You're looking for a bright blue-white star. 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]

A stunning portable projector – in the right situations

Although 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] W. H. Auden's 1933 poem " A Summer Night (to Geoffrey Hoyland)" [120] famously opens with the couplet, "Out on the lawn I lie in bed,/Vega conspicuous overhead". 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 Enjoy portable big screen entertainment with the Nebula Vega. With Full HD clarity, 500 lumens brightness, it also boasts dual stereo speakers and Android TV apps. It keeps going for up to 3 hours of entertainment with a rechargeable battery, and features Keystone correction and Digital Zoom for precise projection. 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]