Mauna Kea: Western View and Meteor Shower — Online Webcam

Mauna Kea — the tallest mountain on Earth from base to summit

When you look at Mauna Kea from the coast of the Big Island of Hawaii, you only see the tip of the iceberg. This dormant volcano rises above the Pacific Ocean by 10,203 meters from its base on the ocean floor, making it the tallest mountain on the planet — nearly a kilometer and a half higher than Everest. About 60% of its height is hidden underwater, and only the upper 4,204 meters are visible above the surface. It is here, at the summit, that the CFHT observatory webcam operates, broadcasting a panorama of the western slope and the night sky.

Mauna Kea is a sacred mountain for Hawaiians, a place where earth and sky meet. For astronomers, it is a point where the atmosphere is thinner, drier, and calmer than almost anywhere else on Earth. The dry air at 4,200 meters contains little water vapor, which interferes with infrared observations, and clouds most often remain below — in the so-called inversion zone. That is why telescopes have been built here for more than half a century.

Thirteen telescopes on the roof of the Pacific

The summit of Mauna Kea is a whole city of science. On an area of just over five square kilometers are located 13 telescopes from different countries and organizations. Here stand the optical giants Keck I and Keck II with ten-meter mirrors, the Japanese Subaru with an 8.2-meter mirror, the British infrared telescope UKIRT, as well as the radio telescopes Submillimeter Array and James Clerk Maxwell Telescope.

The CFHT camera faces west, so not all observatories are always visible in the frame. But in good weather, the white domes of the Subaru Telescope and the compact SMA antennas can be seen in the background — the Submillimeter Array is located near Subaru and often falls within the field of view of neighboring cameras. The Canada-France-Hawaii Telescope itself is one of the oldest on the mountain: its 3.6-meter mirror began being used for observations back in 1979.

What the CFHT camera shows — view to the west

The CFHT observatory webcam is installed at an altitude of 4,204 meters above sea level and is aimed at the western slope of Mauna Kea. During daylight hours, the foreground shows the characteristic reddish-brown volcanic landscape: solidified lava, cinder cones, gravel roads leading to the domed telescope buildings. The white observatory domes stand out brightly against the dark volcanic ground.

On the horizon in clear weather, the outlines of neighboring volcanoes are visible — Mauna Loa, Hualālai, and even distant Mauna Kea with its bizarre cinder cones. But the main event happens at night: when the sun sets over the Pacific Ocean, the camera captures a starry sky of incredible clarity. It is during these hours that astronomy enthusiasts from around the world tune into the broadcast hoping to see a meteor shower or aurora — although the latter is a great rarity at Hawaiian latitudes.

Meteor showers over Mauna Kea

The high, dry atmosphere and remoteness from city lights make Mauna Kea an ideal place for observing meteor streams. The Perseids in August, the Geminids in December, the Leonids in November — each of these streams gives observers dozens, and sometimes hundreds, of shooting stars per hour. The CFHT camera is not always able to capture individual meteors due to its short exposure, but during peak activity periods, bright flashes and trails can be seen on time-lapses.

The best time for observation is the new moon, when moonlight does not interfere with seeing faint meteors. The webcam operates around the clock, and if you are lucky with the weather, the night sky on screen will appear in all its splendor: the Milky Way from horizon to horizon, twinkling stars, satellites crossing the frame, and rare bright bolides leaving a smoky trail.

Weather at the summit: snow, wind, and ice

Despite the tropical latitudes, the summit of Mauna Kea is a harsh place. In winter, temperatures drop below zero, and the National Weather Service has repeatedly issued blizzard warnings — a phenomenon so rare for Hawaii that it makes the news. Snow on the summit can lie for several weeks, and the road to the observatory is closed due to ice and poor visibility.

Wind at 4,200 meters reaches 100–150 km/h, and clouds sometimes envelop the summit in a dense layer, hiding the telescopes and the horizon. On such days, the camera shows only a gray veil of fog — but as soon as the clouds clear, the world appears again with stunning clarity. High winds, ice, and snow are the reason the road may be closed, and tourists are advised to wear warm clothing and acclimatize at mid-altitude.

How to get to the observatory

The road to the summit of Mauna Kea starts from the Visitor Information Station at an altitude of 2,800 meters. Below is asphalt, further on is a gravel road with an 11% gradient, where a four-wheel-drive vehicle with low gear is recommended. Rental cars from many companies have restrictions on driving above the visitor center — check this in advance.

There are no toilets, cafes, or shelters from the weather at the summit. At 4,200 meters, oxygen is 20–30% lower than at sea level, and unprepared people may experience altitude sickness. Therefore, before ascending, it is recommended to spend at least an hour at mid-altitude, drink water, and not plan any strenuous activities. Clothing should be layered: even in summer, temperatures at the summit can be around zero, and the wind will cut through any thin jacket.

An astronomical Mecca: why Mauna Kea

The choice of Mauna Kea for building observatories is no accident. The Big Island of Hawaii is in the center of the Pacific Ocean, far from industrial centers and major cities. Light pollution here is minimal — the nearest town, Hilo, with a population of about 45,000, is located on the other slope of the mountain, and its lights hardly interfere with observations. The dry tropical air, stable air currents, and more than 80% of clear nights per year make the summit one of the best astronomical sites on the planet.

For comparison: at most mainland observatories, clear weather occurs on only 50–60% of nights. At Mauna Kea, astronomers get nearly 300 nights per year with ideal observing conditions. It is here that fundamental discoveries have been made — from studying distant galaxies to searching for exoplanets and dark matter.

What you can see on the camera

The CFHT webcam on Mauna Kea broadcasts a panorama of the volcano's western slope in real time. During the day, the frame shows the reddish volcanic landscape with roads, technical structures, and white domed telescope buildings. On the horizon — distant mountains and the vast Pacific Ocean. At night, the camera captures the starry sky, and during meteor stream periods, you can see bright flashes and trails of shooting stars.

In unfavorable weather — fog, rain, snow, or ice — the image may be blurry or completely obscured by clouds. But as soon as the sky clears, one of the most impressive sights on Earth will open before you: a volcanic summit reaching into the bottomless starry sky, where every point is a distant sun with possible planets around it.