# M101 maximum wavelength

1. Sep 27, 2007

### menager31

What is the maximum wavelength of m101 seen from the Earth by eye?

2. Sep 27, 2007

### chemisttree

Do you mean longest wavelength? If so, that would be red (~700 nm). The H-alpha is the most intense emission line.

If you mean brightest wavelength, I haven't a clue.

Last edited by a moderator: May 3, 2017
3. Sep 28, 2007

### menager31

longest, thanks