Taka ciekawostka. Merkury też ma warkocz - widoczny w paśmie sodu.
What apparently looks like a comet, it's just Mercury with its sodium tail. I long waited for favorable conditions, but bad weather disappointed me the most of the times. It took a seven and a half minutes exposure (guided on Mercury with a crosshair eyepiece, that's why stars are trailed) to make the sodium tail visible. Not many people know about this almost unique feature of Mercury and I thought it could be interesting. This is one of three successful attempts. This is the equipment I used: Stellarvure 66/400 refractor; William Optics 0,8x reducer; Edmund Optics filter; Pentax K3-II at 1000 ISO. Location is the balcony of my house in the center of Veroli, FR, Italy. The false color version reproduces the colors of sunset I could see with unaided eye in the moment I shot the picture; the composite image is a comparison with another shot made after 3 days (may 30th)