While it's okay to get excited and give Sirius its proper due, it is also important to realize that Sirius' advantage over the celestial competition lies chiefly in that old real-estate maxim – location, location, location. Sirius' meaning in Greek is "glowing," which could be a reference not only to its brightness but to the fact that it characteristically twinkles a lot with changing atmospheric conditions. Sirius' star location is at a right ascension of 6 hours, 45 minutes, 8.9 seconds.
Rigel looks slightly brighter now, but Betelgeuse is a variable star, meaning that its brightness waxes and wanes with stellar activity. If you’re up before daybreak, take a moment to see the sky’s brightest star, Sirius, on these October mornings. Canopus (apparent magnitude –0.72) is never visible from much of the Northern Hemisphere. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. Sirius is A1, which means "whitish and fairly hot.". One easy way to find Sirius in winter evening skies is to locate Orion, which dominates this region of sky. Only one other star, Canopus, is "below zero." Also, Canopus is 309 ly away, and its absolute magnitude is a robust –2.5. This would quickly reveal which of the stars in the sky had been toiling in obscurity because of sheer distance, and which had been enjoying leading roles on Earth thanks to good location instead. Modern societies are rife with distractions and sources of entertainment, and if you are so inclined, you can spend a great deal of your life staring at a computer or phone screen (although you should take care to get outside for same daylight and exercise every day) and feel like you're really not missing much. An example of a star chart website is in the Resources.
In ancient Greece, the astronomer Hipparchus proposed a scheme that assigned the brightest stars a magnitude of 1, the stars that only the most eagle-eyed observers could spot on a clear night a 6, and the other visible stars a 2, 3, 4 or 5. Students and adults who are at least passively engaged with the world of astronomy may know that the brightest star in the sky (at least to Earthlings) is named Sirius, and of this group, a handful probably know that this star is nicknamed "the Dog Star" because it is in the constellation Canis Major. If traveling were impossible and literature nonexistent, billions of people the world over would never even know about Canopus, and that Sirius had a somewhat close rival for the honor of brightest star. In fact, scientists can and do classify objects in terms of their absolute magnitude, which is how bright something would look from a distance of 10 parsecs, or 32.6 ly.
It is an extremely luminous star (absolute magnitude: –7.0). Formerly with ScienceBlogs.com and the editor of "Run Strong," he has written for Runner's World, Men's Fitness, Competitor, and a variety of other publications. I will search for it every morning as it was so enchanting.
When you consider what it means to be elite, being in the top 20 or so of all of the stars visible in the entire sky (and any one person can only see half of it at once) should certainly qualify. It was possible to set it up so that a first-magnitude star (1.0) would be five times brighter than a sixth-magnitude star (6.0), and that a change of 5 magnitude units implied a brightness change of 100 in the opposite direction, generally.
What this means is that a change in magnitude is found by taking the logarithm to the base 10 of the fraction of new intensity (I) over old intensity (I0) and then multiplying the result by – (5/2), or –2.5.
It’s the star Sirius in the constellation Canis Major, brightest star in the sky. This star is enchanting, so much so that – every year, beginning in Northern Hemisphere autumn – we get many, many questions about a multicolored star twinkling in the southeastern to southern sky after midnight. Naval Observatory to find out when Sirius will rise tonight from your part of the world. Orion, for reference, is most easily seen in the southwestern night sky from November to February. This photo from EarthSky Facebook friend Susan Jensen in Odessa, Washington. Since our atmosphere is causing the light to break into its colors, and since Sirius is often seen low in the sky now (where you are peering at it through a thicker layer of atmosphere than when it’s overhead), the flashing colors of Sirius are very obvious.
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