Observatory Stay

Otani Sanso

Yamaguchi, JP. Bortle 4 sky, scheduled programming, and astronomy-forward stay context.

Japan LaunchJapan launch-card candidate with official source notes attached.
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1 stay - Ready for offline
$520/ night est.
Bookable now
Guests
2
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Trust & Evidence

Strong property evidence

Status
Bookable Now
Next proof
Evidence is sufficient for a booking-forward Stella Stay card.
Source
Official Property
Last verified
2026-05-26

Source Evidence

1 tracked source URL attached.

Source-linked1 source attached

Observing Fit

Telescope inventory
8 in maximum aperture from current source evidence or Stella launch estimate.
Resident astronomer
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Category
Observatory Stay
Tier
stella prime

Planning Notes

Booking confidence
Bookable Now
Bortle confidence
verify
Last verified
2026-05-26
Verification note
Japan launch card; official ryokan facility page confirms the observatory dome and booking path.
Highlights3
  • Luxury ryokan with 8th-floor observatory dome
  • Specialist-guided astronomy viewing
  • Official property booking path

The sky during your stay

What you can expect overhead at Otani Sanso through the year — Moon phases and eclipses are exact dates; the Milky Way and aurora are seasonal likelihoods. Pick a month to plan around it.

Dark window Milky Way Meteors Eclipse★ Best months to visit

September 2026 · recommended

  • Darkest skies

    New Moon on Sep 11 — the best window for the Milky Way and faint objects.

  • Milky Way core seasonseasonal

    The galactic core is up at night and well placed here.

Dark-sky parks & sites near here

Certified parks, reserves, and observing sites within reach of this stay.

On the map