The Observers Notebook- Titan's Transit of Saturn

Episode 219 In this episode of the Observers Notebook podcast, host Tim Robertson talks to Bob Lunsford about his process for observing and photographing the recent transits of Saturn’s moon Titan. Titan’s Orbit and Motion: • Orbital period around Saturn: ~15.945 Earth days • Average distance from Saturn: ~1.22 million km • Orbital inclination: ~0.3° relative to Saturn’s equator (small, so Titan’s path is nearly aligned with Saturn’s rings). • Apparent size: ~0.8 arcseconds (tiny, only detectable as a “point” in most telescopes). • Shadow transits are possible only when Saturn’s rings are edge-on (every ~15 years). • September 20, 2025 — Start around 5:09 AM UTC (≈10:09 PM PDT); ends ~7:34 AM UTC (~12:34 AM PDT); Titan may also be visible near its shadow. • After October 5–6, 2025, this spectacular phenomenon won’t happen again until 2038–2039. You can contact Bob at: lunro.imo.usa@cox.net Stellarium For more information you can visit the ALPO web site at: You can also support this podcast at Patreon: Listen to the podcast on Soundcloud:

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The Observers Notebook- Titan's Transit of Saturn is an episode from Observers Notebook by Observers Notebook- The Official ALPO Podcast.

This episode is 00:22:47 long.

This episode was published on Sep 10, 2025.

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