The Chicago Astronomer - Venus Greatest Brilliance 4/29 Before 6/5 Transit

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The Chicago Astronomer :: Astronomical Events and Observations :: Chicago's Night Sky :: Venus Greatest Brilliance 4/29 Before 6/5 Transit

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Topic: Venus Greatest Brilliance 4/29 Before 6/5 Transit (Read 224 times)

Centaur
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Venus Greatest Brilliance 4/29 Before 6/5 Transit
« Thread Started on Apr 28, 2012, 1:40pm »

According to my model Venus achieves its greatest brilliance for its current evening apparition at magnitude -4.5 on April 29. In reality subtle shifts in Venus’ atmosphere can slightly alter the accuracy of this estimate. Venus stellar magnitude is essentially stable around this value for a couple of weeks before April 29 and a week or so afterward.

Venus’ brightness has been slowly increasing since superior conjunction in August. Its growing angular diameter has compensated for the shrinking fraction of disk illumination (phase). But now the latter factor will become dominant. There will be a somewhat noticeable drop off in brightness from mid-May into the early June transit when Venus will appear as a black dot on the Sun.

Below is a graph I created to chart the changes in Venus’ brilliance. For more of my related Venus graphics including transit previews for 44 cities, check out my Venus webpage: www.CurtRenz.com/venus

[image]

« Last Edit: Apr 28, 2012, 1:41pm by Centaur »

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For astronomical graphics, including monthly wallpaper calendar, visit:
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Paulie pchris00
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Re: Venus Greatest Brilliance 4/29 Before 6/5 Tran
« Reply #1 on Apr 30, 2012, 9:10pm »

Greatest brilliance is nice, but I can't wait until least brilliance. I want to see Venus black.

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Centaur
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Re: Venus Greatest Brilliance 4/29 Before 6/5 Tran
« Reply #2 on May 22, 2012, 10:53am »

Apr 30, 2012, 9:10pm, Paulie pchris00 wrote:

Greatest brilliance is nice, but I can't wait until least brilliance. I want to see Venus black.

Okay, Paulie, I'll see what I can do about it: www.CurtRenz.com/venustransit

« Last Edit: May 22, 2012, 10:54am by Centaur »

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For astronomical graphics, including monthly wallpaper calendar, visit:
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