Electronics E Books _HOT_ Download Bright Light: Star

The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars, Yale Bright Star Catalogue, or just YBS, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth. The catalog lists 9,110 objects, of which 9,095 are stars, 11 are novae or supernovae (which were "bright stars" only at the time when they were at their peak),[1] and four are non-stellar objects which are the globular clusters 47 Tucanae (designated HR 95) and NGC 2808 (HR 3671), and the open clusters NGC 2281 (HR 2496) and Messier 67 (HR 3515).[2]

The Harvard Revised Photometry, based on visual observations, has been superseded by photo-electric measurements using band pass filters, most prominently the UBV photometric system. This can differ substantially (up to 1.8 magnitudes [7]) from the older system. Hence many stars brighter than V=6.50 are not in the YBSC (and hundreds of stars in the YBSC are fainter than V=6.50). Dorrit Hoffleit with Michael Saladyga and Peter Wlasuk published in 1983 a Supplement with an additional 2603 stars for which a V magnitude of brighter than 7.10 had been measured at that time.

Electronics E Books Download Bright Light: Star

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It is a golden age. Intrepid hyperspace scouts expand the reach of the Republic to the furthest stars, worlds flourish under the benevolent leadership of the Senate, and peace reigns, enforced by the wisdom and strength of the renowned order of Force users known as the Jedi. With the Jedi at the height of their power, the free citizens of the galaxy are confident in their ability to weather any storm. But even the brightest light can cast a shadow, and some storms defy any preparation.

One of the brightest stars in the night sky has been getting oddly brighter, prompting speculations that it might soon explode in a supernova. Should we really look forward to such a dazzling celestial spectacle?

The star in question is Betelgeuse, a huge red-tinged star that sits at the left shoulder of the unmissable constellation Orion. Some 650 light-years from Earth, Betelgeuse usually ranks as the tenth-brightest star in the night sky. Since early April, however, the star has climbed to the seventh spot and currently shines at over 140% its "usual" brightness, according to the Twitter account Betelgeuse Status, which tracks the star's behavior.

Betelgeuse is a red giant, an enormous star that has burned up all the hydrogen fuel in its core and expanded hundreds of times beyond its original envelope. Astronomers believe the star is now fusing helium into carbon and oxygen, a phase in a star's life that lasts tens to hundreds of thousands of years and precedes the star's demise in a supernova explosion. Betelgeuse's recent antics, the beginning of which date back to 2019, have led some to speculate that the moment of its spectacular death might be near. If Betelgeuse were to go boom it would be the nearest supernova explosion in more than 400 years and it would be so bright it would be visible even in daylight.

Betelgeuse is a variable star known for regular oscillations between brighter and dimmer periods. For more than 100 years, astronomers have observed Betelgeuse lighten up every 400 days, then drop to about half of its peak brightness and brighten up again. But in December 2019, the star unexpectedly dimmed beyond what had ever been seen before, hitting a low 2.5 times fainter than its usual dimmest shine. The cause of the event, since dubbed the Great Dimming, was later traced to an enormous expulsion of material from the star's interior that created a huge dust cloud that subsequently obscured our view of the star.

Although Betelgeuse has since recovered its usual brightness, the star has not been quite its old self since the Great Dimming. Its 400-day brightness oscillation period has halved to 200 days and, on top of that, the star now appears to be going through the extra brightening that excites skywatchers. The astronomers that Space.com spoke to, however, are tempering the supernova expectations.

Like MacLeod, Montargs thinks that Betelgeuse still has many thousands of years of life ahead of it and is rather unconcerned by the recent unexpected brightening. In fact, the star has been this bright previously, he said, albeit only for brief periods of time.

"If we compare the current brightening to the Great Dimming, it's really quite negligible," Montargs said. "During the Great Dimming, the magnitude [a measure of a star's brightness that is logarithmic and inversely proportional to the visible brightness] went from 0.8 down to 1.75. The usual peak brightness, on the other hand, is about 0.3, and now we are only at about 0.1."

Montargs said that a lot of our assumptions about Betelgeuse come from our observations of other red giant stars. For example, another Milky Way red giant known as VY CMa, located 3,900 light-years away from Earth in the constellation Canis, is thought to be much closer to the moment of its death than Betelgeuse. But unlike the brightening Betelgeuse, that star has been consistently dimming over the past 100 years.

"When it happens, the star will become as bright as the full moon, except that it will be concentrated in a single point," Montargs said. "For maybe two months, it will be so bright that if you shut down all the lights in a city and have no clouds, you would be able to read a book in the light of the supernova. It will be so bright that it will be visible in the daylight, too. There will be another star shining in the sky during the day."

"If in September it's still as bright as now, or brighter, then we should start wondering what's happening," said Montargs. "But from my perspective, I don't think it is that interesting at this stage."

The Near Infrared Camera (NIRCam) is Webb's primary imager that covers the infrared wavelength range 0.6 to 5 microns. NIRCam detects light from: the earliest stars and galaxies in the process of formation, the population of stars in nearby galaxies, as well as young stars in the Milky Way and Kuiper Belt objects. NIRCam is equipped with coronagraphs, instruments that allow astronomers to take pictures of very faint objects around a central bright object, like stellar systems. NIRCam's coronagraphs work by blocking a brighter object's light, making it possible to view the dimmer object nearby - just like shielding the sun from your eyes with an upraised hand can allow you to focus on the view in front of you. With the coronagraphs, astronomers hope to determine the characteristics of planets orbiting nearby stars.

Additionally during the Novosibirsk level, when Artyom is inside the institute, there seems to be a new kind of anomaly that shines bright rays of light, while seemingly having an electromagnetic influence on objects within the level as chairs and tables suddenly start to float. It appears to follow Artyom from outside as he progresses through the building. The glowing ball also seems to give off more radiation when closer to it and activates keys on a piano when Artyom passes it. It also gives off lightning in a similar fashion to the normal anomalies, though it does not hurt Artyom. be457b7860