Gassendi Home

Move your mouse over the picture to see the names of the various craters.

Sunset in Gassendi This picture is a composite of two pictures taken on the same night and shows the south-western limb of the Moon. If you were there on the floor of the crater Gassendi the sun would have set, but you would still be able to see it striking the top of the central mountain and the mountains in the east.
Click here to see closer pictures of Gassendi under morning lighting.
The picture was taken with a ToUcam attached to my ETX125 on 23rd August 2003, when the Moon was 24.9 days old.

Lunar Phase: 236.0°
Colongitude: 218.4°
Date and Time: 23rd August 2003 02:56 UT
Camera: ToUcam 740K
Telescope: ETX125 at prime focus
Capture: K3CCDTools. High gamma, 1/25", 0% gain, 300 frames
Processing: Registax. 163 frames stacked. Wavelet 1-2 = 5


This is another example of the importance of libration in images of the Moon.  This picture was taken at the same phase (25 days) as the picture above, but the libration had tipped the Moon over 8° to the west in this picture compared to the earlier one, and the colongitude reflects that fact.  Look particularly at Gassendi;  in the upper picture it is almost in darkness, whereas in the lower picture it is fully illuminated.
The picture was taken with a ToUcam attached to my LX200 on 17th October 2006, when the Moon was 25.1 days old.  The scale markers are approximately 100 Km north and east.

Lunar Phase: 233.8°
Colongitude: 212.0°
Date and Time: 17th October 2006 06:22 UT
Camera: Atik 1-HS
Telescope: LX200 at prime focus
Capture: K3CCDTools. Low gamma, 1/25", 56% gain, 704 frames
Processing: Registax. 637 frames stacked. Wavelets 1-3 = 10, contrast 170, histogram 40-255


And now a better picture of this same general area with the light coming from the other direction.  The better quality allows us to see some interesting features.  Gassendi is a shallow crater because it has been flooded by lava.  Although my picture seems to imply that there is a gap in the southern wall through which the lavas could have come from Mare Humorum, this is not so.  Higher-resolution pictures show that the wall is continuous so the lavas must have come up through cracks in the floor of the crater.  The floor has many rills a few of which may be glimpsed here.  Mersenius is outside the depth of the Humorum basin but its floor is domed, evidence of uplifting.  Finally the two craters Henry, named after Joseph Henry, an American physicist who invented the electric motor, and Henry Frères named after the brothers Paul and Prosper Henry, French astronomers who pioneered astrophotography, built large refracting telescopes and produced a photographic chart of the skies.
A picture covering Gassendi and the area to the east in similar lighting can be found here.  This picture was taken with a DMK21AF04 camera attached to my LX200 on 27th March 2010, when the Moon was 12.3 days old.  The scale markers are approximately 100 Km north and east.

Lunar Phase: 28.9°
Colongitude: 61.4°
Date and Time: 27th March 2010 23:34 UT
Camera: DMK21AF04
Telescope: LX200 at prime focus with Astronomik OIII filter
Capture: ICCapture, 1/91" gain 870, 3516 frames
Processing: Registax. 6 alignment points, 413 frames stacked. Wavelets 1-2 = 10
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