Amagi Highland - Starry Sky Overlooking the Pacific Ocean at 1000m on the Izu Peninsula in Japan

Overview

Amagi Highland is a 1000-meter elevation highland located in Izu City, Shizuoka Prefecture, forming the backbone of the Amagi mountain range on the Izu Peninsula. With relatively good access from the Tokyo area, it combines a mild Pacific climate with excellent stargazing conditions.

It is also the starting point of the famous Amagi Pass hiking course, allowing visitors to enjoy both daytime hiking and nighttime stargazing.

Observation Environment

Due to its geographic position in the central part of the Izu Peninsula, the southeast faces the Pacific Ocean with no artificial light sources. The dark expanse of ocean extending to the horizon offers the advantage of easily observing celestial objects at low positions in the southern sky.

Conversely, light pollution from the Mishima-Numazu direction has slight influence from the north to northwest. Overall, the Bortle scale class is about 3, but conditions in the southern sky are significantly darker.

Winter months offer the charm of the high clear sky rate characteristic of the Pacific side, with clear weather continuing in Izu even when Japan Sea areas are covered in snow clouds, blessed with stable stargazing weather.

Recommended Observation Points

The Amagi Highland parking area (Amagi Traverse trailhead) is the most accessible observation point. There is a paved spacious parking lot with the southern sky widely open.

Access

About 60 minutes via the Izu Bypass and Izu Central Road from either Numazu IC on the Tomei Expressway or Nagaizumi-Numazu IC on the New Tomei. The mountain roads have many curves, so nighttime driving requires caution.

Observation Tips

Although the Izu Peninsula is a warm region, the 1000-meter highland drops below freezing in winter. Cold weather protection is as necessary as at other highland spots. Moist air from the sea may rise and cause sudden fog, so watch out for that. For photography, a lens heater is convenient for protecting against condensation.