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Size of horsehead nebula 
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#1
May1609, 11:18 PM

P: 14

Hi,
I was looking at information about the Horsehead nebula on wikipedia http://en.wikipedia.org/wiki/Horsehead_nebula and it says that its apparent dimensions are 8x6 arcmins. I'm not sure how to find the actual dimensions, say in lightyears. Here's how I believe it should be, but I'm sure I'm wrong. According to wikipedia, the nebula is 1500 ly away. 1 arcmin = 1/60 degrees. So the dimensions should be: 1500*tan(8/60) by 1500*tan(6/60), which is 3.5 ly by 2.6 ly. Have I got it right, or have I missed something obvious. Thanks, Maria 


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