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Last Chance to Observe Sunlit SMART-1 Impact Site before Impact

Last Chance to Observe Sunlit SMART-1 Impact Site before Impact

18 August 2006

With the Moon now in its last crescent phase, visible after midnight and before sunset, the next nights offer the last chance to make ground-based observations of the SMART-1 impact site in sunlight.

Reconnaissance view of the Moon on 20 August at 00:00 UT, showing a large area around the nominal SMART-1 impact site.

18-19 August
In the nights of 18 and 19 August 2006, observations can be used for reconnaissance maps of the surface features, possibly in various colours.

20 August
On 20 August the terminator will be near Lacus Excellentiae, the region where SMART-1 is scheduled to impact the surface on 3 September. This is a perfect opportunity to map the long shadows over the still uncertain topography of the area. Amateur and professional astronomers are encouraged to image the areas at these dates for a detailed analysis of the area's relieves.

21 August
On 21 August the terminator will have passed Lacus Excellentiae and the region will no longer receive direct sunlight, but it will be well illuminated by Earthshine, with Earth presenting a gibbous face. Ground observations on this date can be a good rehearsal to recognise the potential sites of impact in Earthshine, in preparation for observations on the night of impact itself.

September
On 4 September, the SMART-1 impact site will move into direct sunlight again as the terminator crosses Lacus Excellentiae. This allows searching for the SMART-1 ejecta blanket by comparing new observations with those made prior to impact.

Last Update: 1 September 2019
16-Oct-2021 00:06 UT

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