This weekend promises an extraordinary celestial event: a blue micromoon. This unique lunar occurrence combines two phenomena that are relatively rare in the night sky.
Understanding the Blue Micromoon
A blue micromoon occurs when a full moon, which is the second in a calendar month, coincides with the moon’s furthest point from Earth. Dr. Greg Brown from the Royal Observatory Greenwich explains that the term “blue moon” commonly refers to this monthly occurrence. In simpler terms, it denotes the second full moon within one month, which happens every few years.
What Defines a Blue Moon?
- Monthly Blue Moon: The second full moon in a single month.
- Seasonal Blue Moon: An additional full moon in a season, often the third one in a series of four.
What is a Micromoon?
The term “micromoon” refers to the moon’s size as seen from Earth. The moon’s orbit is elliptical, meaning its distance from our planet varies. When a full moon occurs at its furthest point, it is termed a micromoon. Although it may seem much smaller, a micromoon appears only about 14% smaller than a supermoon and about 6% smaller than a regular full moon.
Rarity of the Blue Micromoon
While blue moons occur every couple of years and micromoons happen two or three times annually, a blue micromoon is quite rare—occurring roughly once every couple of decades. The timing of these events can also vary based on time zones, complicating the ability to pinpoint when they are occurring globally.
Upcoming Blue Micromoon Dates
The next occurrence of a blue micromoon in the UK is forecasted for 2066. In contrast, some regions, such as the United States, anticipate experiencing one in 2053.
Viewing the Blue Micromoon
For those eager to witness this celestial event, the full moon will officially occur on May 31 at 9:45 AM BST. However, the optimal viewing times for enthusiasts in the UK will be on the evenings of Saturday and Sunday, as the moon will appear nearly full throughout the night before and the night after.
- Best Viewing Times: Saturday and Sunday evenings around the full moon date.
- Visibility: In the northern hemisphere, the blue micromoon will be low on the horizon, while in the southern hemisphere, it will be prominently high in the sky.
The Color of the Moon
Despite the name, a blue micromoon won’t actually appear blue. The term “blue” in “blue moon” does not refer to its color. Occasionally, atmospheric conditions from events like volcanic eruptions or forest fires can lend a bluish hue to the moon, but this is unrelated to the lunar cycles.
Conclusion
Mark your calendars for this weekend’s blue micromoon. While it might not be the rarest of astronomical events, its combination of characteristics makes it a special sight for stargazers. Don’t miss the opportunity to enjoy this unique display in the night sky.
