Two comets, Lemmon and Swan, are sweeping across the western and southwestern evening sky this week. Lemmon is closest to Earth on October 21, and will appear to the upper right of the bright star Arcturus, which is in the west-north, low in the sky, in the evening twilight. The comet is a good target for binoculars and could become visible to the eye alone. Comet Swan is farther toward the southwest, to the upper left of teapot-shaped Sagittarius on the 21st. It, too, is a good binocular target. Both comets will slide to the left along the horizon during the rest of October.
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