Occultation of TYC 1866-01429-1 by (177) Irma on 2011-09-17 Green O+: J. Lecacheux et al Optics: M1020 | Method: VID | Duration: 1.37 2.23,48.80,0 Green O+: Thierry Midavaine Optics: M254 | Method: VID | Duration: 2.84 2.30,48.75,0 Red O-: Marcin Filipek Optics: M165 | Method: VIS | Duration: 19.75,50.21,0 Red O-: E. Frappa/A. Klotz Optics: M250 | Method: CCD | Duration: 6.92,43.75,0