Typo?

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Typo?

ER — 10/15/2013 12:13:36 AM (archived)

5.5 AU seems about reasonable for a red supergiant.

At 600 ly, a diameter of 5.5 ly would mean its disc would appear 5.5/600 radians = about 1/2 a degree, or about the apparent size of the solar or lunar disc.

Sorry, don't mean to nitpick. Still, its pretty big. If Betelgeuse was placed where our sun is, Mars would be orbiting inside it.

The whole thread (12 posts)

Objects in space... - TB - 10/11/2013 5:16:13 PM
- Distance verses size - SteveS - 10/14/2013 5:12:25 PM
  - Typo? - ER - 10/15/2013 12:13:36 AM
    - Well, Betelgeuse's size and distance is still in debate with estimates varying widely - SteveS - 10/15/2013 1:58:58 PM
      - Granted. We know little about the accurate dimensions of the disc, - ER - 10/15/2013 4:36:05 PM
        
        Oh that - SteveS - 10/15/2013 8:11:06 PM
- Another way of looking at it... - ER - 10/11/2013 6:11:13 PM
  - Do you find it odd that the sun and the moon have almost the same apparent diameter? - RobVG - 10/15/2013 1:52:53 AM
    - Its a coincidence. - ER - 10/15/2013 2:59:16 AM
      - Its also a coincidence there's a bright star near the N pole. - ER - 10/15/2013 3:07:13 AM
        
        And a temporary coincidence at that. - TB - 10/15/2013 3:32:27 AM
        
        Gibbous this day our daily bread. - ER - 10/15/2013 4:02:45 AM

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