The primary week of October kicks off with two don’t miss skywatching occasions.
It’s a busy skywatching month forward. The primary full week of October sees two top-notch skywatching occasions, with Saturn reaching opposition, and the Moon occulting Jupiter for North America on October sixth.
This month’s occultation of Jupiter by the Moon is among the best-placed and high skywatching occasions for 2026. The occasion transpires within the early morning hours of Tuesday, October sixth, centered on 10:16 Common Time/6:16 AM Jap Time (EDT). The Moon is a -20% illuminated waning crescent when it covers up Jupiter, which means the daytime illuminated aspect of the Moon will paved the way when Jupiter ingresses behind the Moon, and can reappear from behind the Moon’s darkish limb.
The Moon strikes its personal half a level obvious diameter about as soon as each hour, although ingress/egress instances will differ primarily based in your location. Not like final month’s daytime occasion, this month’s occultation of Jupiter happens below predawn skies for the jap contiguous United States (CONUS) and Canada. The IOTA has a list of ingress/egress times for choose websites alongside the trail.
The visibility footprint for the October sixth occultation of Jupiter by the Moon. Credit score: IOTA.
This occasion goes down throughout mutual transit season for Jupiter’s moons, at present underway. -1.9 magnitude Jupiter is 34” in obvious dimension, and can take a full minute to vanish/reappear from behind the Moon. This leisurely affair will lend itself to observing and recording on video, and the nighttime aspect of the Moon lit by Earthshine ought to spherical out a really photogenic celestial scene.
The reappearance of Jupiter from behind the Moon on October sixth. Credit score: Stellarium.
The subsequent good lunar occultation of Jove for the CONUS isn’t till the center of the following decade on September 28, 2034.
Subsequent up, Saturn reaches opposition for 2026 on October 4th. Falling close to final month’s equinox, this places Saturn within the uncommon place of straying simply into the nook of the non-zodiacal constellation Cetus the Whale.
Saturn rising at opposition 2026. Credit score: Stellarium.
The present tilt of the rings of Saturn are 12 levels large in late 2026, widening from edge-on in 2025. The rings will once more attain their widest tilt in 2031. Saturn is at all times a sight to behold on the eyepiece, even in a small telescope.
It is price awaiting enigmatic spokes on Saturn’s rings as we come off of final yr’s equinox season for the planet. These disruptions appear like radial streaks throughout the aircraft of the rings, and are a considered because of meteoroid impacts.
An intriguing impact to look at for close to opposition is what’s generally known as the Seeliger Effect, or opposition surge. It is a retro-reflector sort phenomenon, because the planet reaches 100% illuminated section versus the viewing angle. The Moon close to Full experiences one thing related, because it reaches as much as a half dozen times as bright (over 2 full magnitudes) because the 50% illuminated 1st or Final Quarter section Moon. All these little shadows (or lack thereof) do certainly add up.
Saturn surging in brightness close to opposition. the 2 photos had been taken practically a month aside. Credit score: Maximilian-Vlad Teodorescu.
This impact is already underway, and it particularly outstanding because of Saturn’s prolonged rings. The change is notable, with a surge in about 0.3 magnitudes in brightness. This varies primarily based on how large open the rings are close to opposition. Does +0.3 magnitude Saturn appear brighter to you close to opposition? Are you able to word the change over the following few weeks with the bare eye? zero magnitude stars Capella and Rigel and provide a superb comparability distinction versus Saturn because the surge fades from view. It is unusual to suppose, that you just’re witnessing the cumulative impact of thousands and thousands of little snowball-sized particles in Saturn’s rings, from thousands and thousands of miles away.
There’s plenty of skywatching to look ahead to, and that’s a superb factor. If skies are clear, you’ll want to take a look at Saturn at opposition this month, and don’t miss subsequent week’s occultation of Jupiter by the Moon.