June 2006 Mercury Campaign

Dates: June 4-23

Mercury emerges out of the evening twilight at waning gibbous phase in early June and reaches maximum elongation (24) on June 21. At northern observatories, Mercury will reach up to 7 above the horizon a minimum nautical twilight. Sodium and potassium illumination will be ideal through June 23, but will fade quickly after that.

The bright standard star Regulus (alpha Leo) will set approximately 2 hours after Mercury at nearly the same azimuth, making it ideal for measuring atmospheric extinction once Mercury has set.

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