Blue Micromoon

Blue Micromoon Latest News

Skywatchers will be treated to a rare sight this month: a Blue Moon that is also a “micromoon.

What is a Blue Moon?

• A blue moon is the second full moon in a calendar month. 
• That is unusual because the period from one full moon to another is about 29 1/2 days.
• So when two occur in the same month, the first of these full moons is always on the first or second day of the month. 
• On average, a blue moon occurs once every 33 months or full moons, 41 times per century, or about seven times every 19 years. 
• An even rarer event is when two blue moons happen in the same calendar year, which happens about four times per century. 
• Sometimes, smoke or dust in the air can scatter red wavelengths of light, as a result of which the moon may, in certain places, appear more blue than usual. 
• But this has nothing to do with the name “blue” moon, and the association of the colour with the term is unclear. 

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What is a Micro Moon?

• This refers to the apparent size of the moon as viewed from Earth. 
• The moon is not always a constant distance away from the Earth. 
• Its orbit around the Earth is elliptical.
• The moon is about 363,711 km away at its closest to earth, known as perigee. At apogee, or the furthest point, the moon is about 403,945 km away. 
• If a full moon happens to occur close to its closest point, then we call that a supermoon. And if it’s close to its furthest point, then we call that a micromoon.
• A micromoon appears only about 14% smaller than a supermoon and about 6% smaller than a typical full moon. 

How Rare is a Blue Micromoon?

• Blue moons occur every couple of years, and micromoons occur two or three times every year.  
• A blue micromoon occurs about once every couple of decades. 
• However, they aren’t regular, and two such events may occur closer together or further apart. 
• No special equipment is needed to observe this blue micromoon, and it should be clearly visible in the absence of clouds.

Source: LS