Comments on: Is Sirius the most luminous star? https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/ Updates on your cosmos and world Sun, 08 May 2022 20:18:42 +0000 hourly 1 https://wordpress.org/?v=6.3.2 By: CO#8- I can explain how astronomers determine the luminosity, the temperature and size of stars. – Joliet Junior College – Astronomy 101 class blog https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-860968 Sun, 08 May 2022 20:18:42 +0000 https://earthsky.org/?p=28239#comment-860968 […] Sirius compared to Orion’s belt. Source: https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/ […]

]]> By: Raul Tsi https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-837815 Wed, 22 Mar 2017 13:41:00 +0000 https://earthsky.org/?p=28239#comment-837815 when does Sirius leave the night sky in the northern hemisphere? Does Orion disappear completely as well? The dog days of summer aren’t actually meteorologically based but astronomically based upon the reappearance of Sirius, correct?

]]> By: GeneralChaos https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-825831 Tue, 15 Mar 2016 13:02:00 +0000 https://earthsky.org/?p=28239#comment-825831 In reply to Higgs Boson.

I’m also confused by this. I thought that maybe the core that remains AFTER the explosion has to be 1.4 solar masses in order to overcome electron degeneracy pressure and become a neutron star. But that a star needs to be 15/20 solar masses PRIOR to explosion in order to “go nova”.

]]> By: D.M. Lang https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-825771 Mon, 14 Mar 2016 23:34:00 +0000 https://earthsky.org/?p=28239#comment-825771 ooooppppssss, space station..

]]> By: D.M. Lang https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-825770 Mon, 14 Mar 2016 23:33:00 +0000 https://earthsky.org/?p=28239#comment-825770 I thought the space shuttle was the brightest object in the sky. Where can it be located?

]]> By: GeneralChaos https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-825744 Mon, 14 Mar 2016 14:20:00 +0000 https://earthsky.org/?p=28239#comment-825744 In reply to Higgs Boson.

Apparently binary and ternary systems are pretty common. Unary – is the name given to our one-star system.

]]> By: GeneralChaos https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-825743 Mon, 14 Mar 2016 14:06:00 +0000 https://earthsky.org/?p=28239#comment-825743 In reply to Higgs Boson.

Yes, and Mercury it seems.

The appearance of Sirius in the morning sky marked Summer in ancient Greece.

]]> By: Higgs Boson https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-825738 Mon, 14 Mar 2016 12:32:00 +0000 https://earthsky.org/?p=28239#comment-825738 In reply to GeneralChaos.

I thought the morning star was Venus – a planet, that sometimes becomes an evening star.

]]> By: Bruce D McClure https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-825712 Sun, 13 Mar 2016 23:52:00 +0000 https://earthsky.org/?p=28239#comment-825712 In reply to Bruce D McClure.

Sirius A has a mass of about 2 solar and Sirius B 1 solar. But the two stars are quite far apart, about 20 AU, so it’s not likely that Sirius B would siphon enough material from Sirius A to reach the critical mass of 1.4 solar.

]]> By: Higgs Boson https://earthsky.org/astronomy-essentials/is-sirius-the-most-luminous-star-in-the-sky/#comment-825709 Sun, 13 Mar 2016 23:40:00 +0000 https://earthsky.org/?p=28239#comment-825709 In reply to JMWinPR.

…and Alpha Centauri, the closest star to the Earth other than our Sun, is composed of three stars orbitting each other. Siriusly!

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