Ishigakijima Observatory | Murikabushi Telescope, Stargazing, Booking, Fees & Access Guide

Ishigaki is a world-class stargazing spot praised as “Japan’s most beautiful island for stars.” You can see the Southern Cross, invisible on Honshu, and it’s said to have the most observable stars in Japan—truly a “Star Island.” The base for observing Ishigaki’s starry sky is the “Ishigaki Astronomical Observatory.” Opened in 2006 on the summit of Mt. Maesedake, about 200 m in elevation, it’s a research facility of the National Astronomical Observatory of Japan where you can experience facility tours, stargazing sessions and a space theater all for free—a must-visit spot for stargazing fans.

The “Murikabushi Telescope,” boasting the largest aperture in the Kyushu-Okinawa area at 105 cm; the 4D2U Theater, which lets you experience the universe in 3D imagery; and Yaeyama’s star culture and history—a special experience fusing science and romance will become a special memory of Ishigaki sightseeing. In this article, we’ll fully cover the Ishigaki Astronomical Observatory’s charm, highlights, booking method and access.

What Kind of Place Is the Ishigaki Astronomical Observatory? Japan’s Southernmost National Observatory

The Ishigaki Astronomical Observatory is an observatory opened in 2006 on the summit of Mt. Maesedake on Ishigaki. It’s Japan’s only council-type observatory, operated through a six-party partnership of the National Astronomical Observatory of Japan, Ishigaki City, the Ishigaki City Board of Education, the NPO Yaeyama Hoshi no Kai (Star Society), the Okinawa Prefectural Ishigaki Youth Center, and the University of the Ryukyus.

Located on high ground where the town’s light doesn’t reach, with a subtropical climate where the atmosphere is stable and a high rate of clear summer skies—it’s a top location for the conditions of astronomical observation. While conducting research observation of solar-system bodies and transient objects, it gathers popularity as an observatory open to citizens and tourists too.

Kyushu-Okinawa’s largest | the Murikabushi Telescope

The Ishigaki Astronomical Observatory’s symbol is the “Murikabushi Telescope,” a 105 cm optical-infrared reflecting telescope with the largest aperture in the Kyushu-Okinawa area. “Murikabushi” means “Subaru (the Pleiades cluster)” in the Okinawan dialect—a nickname taken from the sea of stars.

The Murikabushi Telescope works such that, from its dome (8 m in diameter), the doors open on both sides, and during observation it automatically tracks celestial bodies. With precise tracking by computer control, you can clearly observe a universe invisible to the naked eye.

* Due to a malfunction, stargazing sessions may for the time being be conducted with the 40 cm rooftop telescope. Check the official site for the latest information.

Ishigaki is certified as a Dark Sky Place

Ishigaki is the island first certified in Japan as a “Dark Sky Place.” Said to have the second most beautiful starry sky in Asia, a world-standard observation environment is in place. Yaeyama has deeply rooted star-viewing culture—old songs, folktales about stars, and star-viewing stones—so you can have a deep experience where stargazing and cultural experience are one.

The Ishigaki Astronomical Observatory’s Highlights & Experiences

Facility tour | the Murikabushi Telescope up close

On open days, during the daytime (10:00–17:00), you can take a facility tour without a reservation, free of charge. You can view the Murikabushi Telescope up close, and a briefing by staff is also held about once an hour. It’s an irresistible time for stargazing fans.

Evening stargazing session | held only on Sat, Sun & holidays

The stargazing session, held twice each on Saturday, Sunday and holiday evenings, is the Ishigaki Astronomical Observatory’s biggest draw. You can experience observing celestial bodies—the moon, planets, fixed stars and more—with the Murikabushi Telescope.

Item	Details
Days held	Evenings of Sat, Sun & holidays
1st session	20:00–20:30 (10 min later in June & July)
2nd session	21:00–21:30 (10 min later in June & July)
Capacity	30 per session
Fee	Free
Booking	Required (phone 10:00–17:00)

In the summer season it fills up immediately, so once your travel schedule is set, book early. Apply by phone at 0980-88-0013.

4D2U Theater | a space experience in 3D imagery

4D2U (4-Dimensional Digital Universe) is an imaging system that expresses the universe three-dimensionally in four dimensions, adding time to the three dimensions of space. It’s screened in a lecture room called the “Starry Sky Learning Room.”

* Due to equipment malfunction it may be suspended from public viewing for the time being. Check the official site for the latest information.

A rare observatory where you can see the Southern Cross

The Ishigaki Astronomical Observatory is a rare spot where, during January–June, you can see the Southern Cross from the front garden. The experience of observing a Southern Hemisphere constellation, absolutely invisible on Honshu, while in Japan, is exceptional.

Ishigaki Astronomical Observatory Basic Information & Access

Item	Details
Location	1024-1 Arakawa, Ishigaki City, Okinawa
Phone	0980-88-0013
Open hours	10:00–17:00 (entry until 16:30)
Closed	Monday & Tuesday, year-end and New Year (varies if a holiday)
Fee	All free
Parking	1st & 2nd parking lots available
Elevation	Mt. Maesedake summit (about 200 m)

Departure point	Time needed
New Ishigaki Airport	About 50 min by car
Ishigaki Port Remote-Island Terminal	About 20–25 min by car
Banna Park	About 10 min by car

Access notes | the forest road is one-way

The Maesedake forest road to the observatory is one-way. You can’t go in reverse, so confirm the entrance and exit on a map before heading there. We recommend registering the “Yaeyama Forestry Cooperative (0980-82-4097)” as your destination in your car navigation by phone-number search.

The forest road’s design speed is 20 km/h, and there are many curves, so always slow down. During nighttime events it gets crowded, so it may become walking access from the 2nd parking lot.

Nearby Spots to Enjoy Together with the Ishigaki Astronomical Observatory

Banna Park | the emerald-sea observatory

Banna Park, about 10 minutes by car from the observatory. Okinawa Prefecture’s largest prefectural forest park, which you can enjoy together with the superb view from the observatory and astronomy events.

Ishigaki Limestone Cave | the Totoro stalactite

Ishigaki Limestone Cave, about 15 minutes by car from the observatory. Japan’s southernmost limestone cave, where you can savor the mystery of the underground as a set with the mystery of the universe.

Town & Euglena Mall

Euglena Mall is easy to drop by before or after an evening stargazing session. Convenient as a base for dinner and shopping too.

Ishigaki Astronomical Observatory FAQ

Is booking necessary?

The daytime facility tour is no reservation needed, free. The evening stargazing session and 4D2U Theater require booking. By phone (0980-88-0013, reception 10:00–17:00).

How much is the fee?

All free. Being able to enjoy this much abundant experience for free is a major appeal unique to the Ishigaki Astronomical Observatory.

Can I enjoy it with kids?

Yes—it’s hugely popular with families. The sight of a child moved by the starry sky becomes an unforgettable memory. There are stroller rentals and kids’ chairs too.

What happens on a cloudy or rainy day?

Even when celestial observation isn’t possible, staff explain while showing images and footage taken at the Ishigaki Astronomical Observatory in the past. It’s designed so you can enjoy it even in rain.

How long does it take?

For a daytime facility tour, 30–60 minutes. The evening stargazing session is 30 minutes. To experience both, make it a half-day course.

Summary | Experience the Southern Cross and Japan’s Best Starry Sky at the Ishigaki Astronomical Observatory

The Ishigaki Astronomical Observatory is Japan’s southernmost national observatory, housing the Kyushu-Okinawa-largest Murikabushi Telescope. You can experience facility tours, stargazing sessions and the 4D2U Theater all for free, and it’s also a rare spot where you can observe the Southern Cross.

About 20–25 minutes by car from the remote-island terminal; the stargazing session held on Sat, Sun & holiday evenings requires booking. On your next Ishigaki trip, be sure to experience “Japan’s best starry sky.” Surely an unforgettable space experience awaits.