The Auroral Green line 0I at 5577A or 557.7 nm. See: http://adsabs.harvard.edu/full/1971JRASC..65...37M http://adsabs.harvard.edu/full/1958ApJ...128..441H http://adsabs.harvard.edu/full/1971JRASC..65...37M Ed Majden - AMS Meteor Spectroscopy Coordinator http://members.shaw.ca/epmajden/