🌙 Tonight's Sky in Jeju — Sat, October 17, 2026

On Sat, October 17, 2026 the Sun sets over Jeju at 17:58; astronomical twilight ends at 19:21 and the sky is fully dark for 9.9 hours until 05:17, with sunrise at 06:40. The Moon is a first quarter (40.4% lit) and is already up at dusk, setting at 22:25 — after that the sky is moonless.

Naked-eye planets tonight: Jupiter, Mars, Saturn, Mercury. Jupiter rises in the east at 01:46 and climbs to 55° in the southeast by 06:15 before dawn. Mars rises in the northeast at 00:50 and climbs to 65° in the southeast by 06:15 before dawn. Saturn is already 12° up in the east at dusk, peaks at 58° in the south at 23:31, and sets in the west at 05:37. Mercury is already 6° up in the southwest at dusk, peaks at 6° in the southwest at 18:23, and sets in the southwest at 18:56. Uranus (binoculars/telescope) rises in the northeast at 20:01 and climbs to 78° in the south by 03:01 before dawn. Neptune (binoculars/telescope) is already 17° up in the east at dusk, peaks at 56° in the south at 23:00, and sets in the west at 05:01. Venus is too close to the Sun to be seen tonight.

The International Space Station crosses from north-northeast to northeast between 04:57 and 05:01, reaching 26° and shining like a bright star to the naked eye — it pops out of Earth's shadow at 04:57. Comet 161P/Hartley-IRAS (JPL mag. 15) is highest at 19:53, 63° in the south; Comet 2P/Encke (JPL mag. 17.1) is highest at 22:58, 74° in the south — both remain telescope/imaging targets. Kp is 1 (quiet), so aurora is possible only above about 64.9° geomagnetic latitude — not expected from Jeju (latitude 33.5°). Coming up: Orionid meteor shower peak in 4 days, Comet 161P/Hartley-IRAS perihelion in 41 days, Geminid meteor shower peak in 57 days.