M8 Hourglass Region in [SII], Ha and [OIII] emission line light

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Selected as "Astronomy Picture of the Day" for September 8, 2003

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[SII] = Red, Ha = Green, [OIII] = Blue


Twisters In hourglass region (image rotated 45degrees, magnified ~4x)

Twisters from Hubble

To read about the Twisters, click here

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re-processed to better match Hubble Colors

[SII] = Red, Ha = Green, [OIII] = Blue

---Image Exposure Details---

Halpha images taken August 19, 2003 at Fremont Peak State Park near San Juan Bautista, California

[OIII] and [SII] images taken August 22, 2003 at Plettstone, a private residence in the Sierra Gold Country in California (near Yosemite National Park)

Celestron C14 imaging scope @ f/11 (F=3910mm)

Finger Lakes Instrumentation IMG1024S imaging camera @-30C and @-27C

RCOS Dichroic Beam Splitter for AO7/IMG compatibility

SBIG ST7E Guide camera controlling 

SBIG AO7 Adaptive Optics System

Astro-Physics AP1200GTO mount

Finger Lakes Instrumentation CFW1 Color Filter wheel

Custom Scientific Narrowband Emission Line Filters

   [Sulfur II]                     672.4nm  3nm FWHM

   Hydrogen alpha        656.3nm  3nm FWHM

   [Oxygen III]                 500.7nm  3nm FWHM

Three exposures of ten minutes through each filter. Total exposure time 1.5 hours

Maxim DL 3.20 used for image acquisition, calibration, DDP, color combination

CCDSOFT 5.00.071 used for guiding/AO7 control

SIGMA Prebeta 11 used for darks, flats and image stacking

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