Phobos and Deimos







Celestron C11, slit attenuator OD 3.5, 17mm eyepiece, Panasonic Mini DV, gain up +18dB, ca. 900 frames of 1/8s exposure time
The numbers in the image indicate the brightnesses of 11.4, 10.3, -2.8, and 11.8 mag.
Image taken by J.-L. Dighaye







Celestron C11, ST8 CCD, 3s exposure time.
Map: D=Deimos, P=Phobos, the numbers near the stars indicate magnitudes 12.15, 14.4.

The image to the right results in fact from one single image, but is displayed with different background and range settings to show both Deimos and Phobos. The light of Mars has been masked by a 0.5mm wide strip of Astrosolar OD=3.5 which was placed into the Baader coronagraph instead of the metal cone.

above: the 12.15mag star and Deimos visible in "10 o'clock" position relative to Mars.
below: Phobos at 10 o'clock position, ca. one Mars-diameter from the limb.

The image was taken at 4:30 local time, long after begin of nautical twilight. M. Rudolf






Celestron C11, ST8 CCD, 30s exposure time. The light of Mars has been masked by a wire of ca. 0.5mm diameter which was placed into the Baader coronagraph instead of the metal cone.

The star to the upper right of Mars is GSC 5819 855 (12mag); Deimos is below. Note the movement of Deimos relative to the star. Image taken by M. Rudolf



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