Anker - Nebula Vega Portable Projector

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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. When the radius of Vega was measured to high accuracy with an interferometer, it resulted in an unexpectedly large estimated value of 2.73 ±0.01 times the radius of the Sun. This is 60% larger than the radius of the star Sirius, while stellar models indicated it should only be about 12% larger. However, this discrepancy can be explained if Vega is a rapidly rotating star that is being viewed from the direction of its pole of rotation. Observations by the CHARA array in 2005–06 confirmed this deduction. [12] Size comparison of Vega (left) to the Sun (right) v sp = 10.7 2 + 8.0 2 + 9.7 2 = 16.5 km/s . {\displaystyle v_{\text{sp}}={\sqrt {10.7 The energy flux from Vega has been precisely measured against standard light sources. At 5,480Å, the flux density is 3,650Jy with an error margin of 2%. [62] The visual spectrum of Vega is dominated by absorption lines of hydrogen; specifically by the hydrogen Balmer series with the electron at the n=2 principal quantum number. [63] [64] The lines of other elements are relatively weak, with the strongest being ionized magnesium, iron and chromium. [65] The X-ray emission from Vega is very low, demonstrating that the corona for this star must be very weak or non-existent. [66] However, as the pole of Vega is facing Earth and a polar coronal hole may be present, [56] [67] confirmation of a corona as the likely source of the X-rays detected from Vega (or the region very close to Vega) may be difficult as most of any coronal X-rays would not be emitted along the line of sight. [67] [68]

Firstly, high-quality gadgets and technology products tend to be more reliable. This means that they are less likely to break down or malfunction. When you’re relying on a product for an important task, such as work or communication, reliability is key. Investing in a high-quality NEBULA Vega Portable Full HD Projector can give you peace of mind and help you avoid frustrating situations where your device fails you. The UBV photometric system measures the magnitude of stars through ultraviolet, blue and yellow filters, producing U, B and V values, respectively. Vega is one of six A0V stars that were used to set the initial mean values for this photometric system when it was introduced in the 1950s. The mean magnitudes for these six stars were defined as: U − B = B − V =0. In effect, the magnitude scale has been calibrated so that the magnitude of these stars is the same in the yellow, blue and ultraviolet parts of the electromagnetic spectrum. [47] Thus, Vega has a relatively flat electromagnetic spectrum in the visual region—wavelength range 350–850 nanometers, most of which can be seen with the human eye—so the flux densities are roughly equal; 2,000– 4,000 Jy. [48] However, the flux density of Vega drops rapidly in the infrared, and is near 100Jy at 5 micrometers. [49] 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 the galactic coordinate system, the space velocity components of Vega are (U, V, W) = ( −16.1 ±0.3, −6.3 ±0.8, −7.7 ±0.3) km/s, for a net space velocity of 19km/s. [81] The radial component of this velocity—in the direction of the Sun—is −13.9km/s, while the transverse velocity is 12.9km/s. [ citation needed] Although Vega is at present only the fifth-brightest star in the night sky, the star is slowly brightening as proper motion causes it to approach the Sun. [82] Vega will make its closest approach in an estimated 264,000 years at a perihelion distance of 13.2ly (4.04pc). [83] Following the discovery of an infrared excess around Vega, other stars have been found that display a similar anomaly that is attributable to dust emission. As of 2002, about 400 of these stars have been found, and they have come to be termed "Vega-like" or "Vega-excess" stars. It is believed that these may provide clues to the origin of the Solar System. [24] Debris disks [ edit ] 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] 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. Medieval astrologers counted Vega as one of the Behenian stars [118] and related it to chrysolite and winter savory. Cornelius Agrippa listed its kabbalistic sign under Vultur cadens, a literal Latin translation of the Arabic name. [119] Medieval star charts also listed the alternate names Waghi, Vagieh and Veka for this star. [31]

In addition, high-quality gadgets and technology products tend to have better performance. This is particularly important for products that are used for tasks such as gaming, video editing, or graphic design. A high-quality NEBULA Vega Portable Full HD Projector is likely to have better specs and features, which will translate into better performance and a better user experience. Observations, first with the Palomar Testbed Interferometer by David Ciardi and Gerard van Belle in 2001 [88] and then later confirmed with the CHARA array at Mt. Wilson in 2006 and the Infrared Optical Telescope Array at Mt. Hopkins in 2011, [89] revealed evidence for an inner dust band around Vega. Originating within 8AU of the star, this exozodiacal dust may be evidence of dynamical perturbations within the system. [90] This may be caused by an intense bombardment of comets or meteors, and may be evidence for the existence of a planetary system. [91] Possible planets [ edit ] The radial velocity of Vega is the component of this star's motion along the line-of-sight to the Earth. Movement away from the Earth will cause the light from Vega to shift to a lower frequency (toward the red), or to a higher frequency (toward the blue) if the motion is toward the Earth. Thus the velocity can be measured from the amount of shift of the star's spectrum. Precise measurements of this blueshift give a value of −13.9 ±0.9km/s. [9] The minus sign indicates a relative motion toward the Earth. 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 Vega

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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 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 ] In astronomy, those elements with higher atomic numbers than helium are termed "metals". The metallicity of Vega's photosphere is only about 32% of the abundance of heavy elements in the Sun's atmosphere. [note 3] (Compare this, for example, to a threefold metallicity abundance in the similar star Sirius as compared to the Sun.) For comparison, the Sun has an abundance of elements heavier than helium of about Z Sol= 0.0172 ±0.002. [75] Thus, in terms of abundances, only about 0.54% of Vega consists of elements heavier than helium. Nitrogen is slightly more abundant, oxygen is only marginally less abundant and sulfur abundance is about 50% of solar. On the other hand, Vega has only 10% to 30% of the solar abundance for most other major elements with barium and scandium below 10%. [11] When it comes to buying gadgets and technology products, particularly in the Projectors category it’s important to invest in good quality products. NEBULA Vega Portable Full HD Projector is no exception. There are a number of reasons why quality is so important when it comes to these types of products. 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