1/23/2024 0 Comments One more day one more night![]() This illustration displays the shape of the Canis Major constellation. The ancients felt that the combination of the sun during the day and the star at night was responsible for the extreme heat during mid-summer. 11, when Sirius rises in conjunction with the sun, previously reported. Today, Sirius is nicknamed the "Dog Star" because it is part of the constellation Canis Major, Latin for "the greater dog." The expression "dog days" refers to the period from July 3 through Aug. There is no accepted explanation of how this could have happened. Historical records from the Alexandrian astronomer Claudius Ptolemy (around the year 150 AD) suggest that Sirius was a red star in the past (it is very hot and white today). Are there any scientific mysteries surrounding Sirius that researchers would like to solve? That companion, referred to as Sirius B, has a mass equal to that of our sun, but it's 100 times smaller and thus a million times denser than our sun. Just as important, Sirius has the closest-known "white dwarf," a stellar "corpse," as a binary companion. Sirius is the closest star that's more massive and a lot more luminous than our sun. Why is Sirius of interest to the astronomy community? This is most easily seen by our eyes in the case of Sirius because it's so bright. The air in our atmosphere spreads out (or "disperses") different colors of light by different amounts, creating a rainbow effect for all stars. Out in airless space, stars never twinkle. Tiny differences in the amount of air every fraction of a second between us and Sirius cause the twinkling. We see Sirius through our atmosphere, which is turbulent. ![]() This combination of high intrinsic luminosity and closeness explains Sirius' brightness. Sirius is 25 times more luminous than our sun and just 8.6 light years distant. We asked Michael Shara, a curator in the American Museum of Natural History's Department of Astrophysics, a few frequently asked questions about Sirius. Live radar: abc7.la/LiveMEGADOPPLER Watches/Warnings: abc7.la/WxWarnings Download the free Accuweather app for iPhone and Android devices.Curator and Professor, Department of Astrophysics, Division of Physical Sciences, at the American Museum of Natural History. Click on My News from the bottom menu, then star the topics you'd like to follow and tap Done. If you have the app, turn on push notifications and personalize the app. Get the latest updates on the weather with the Free ABC7 Los Angeles appĭownload the ABC7 app for weather alerts: Click here for iOS devices | click here for Android devices. Desert communities will drop to the 50s by the weekend. The mountains will be sunny and breezy, with a high of 52 during the day, dropping to a chilly 26 overnight.ĭeserts will see a high of 60 with some breezes and a low of 71 overnight. Similar conditions are expected for the valleys and the Inland Empire, where the high temperature will reach 68 degrees with some winds.īeach communities will see a high of 62 with some clouds and 3-5 foot surf. Los Angeles and Orange counties will see a high around 68 degrees on Thursday, then 69 on Friday. Most communities will see temperatures drop to the low 70s or 60s on Thursday and Friday followed by some possible Santa Ana wind conditions for the weekend. LOS ANGELES (KABC) - As we approach the weekend, temperatures will continue to cool off a bit in Southern California.
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