HD 100444 (HIP 56331), a blue supergiant star in Centaurus

HD 100444 (HIP 56331) is a blue supergiant star (spectral type O9Ib) in the constellation Centaurus at magnitude 8.42.

Ashland Astronomy Studio October 3, 2026 Star

// Fade in · only sidebar boxes, never the main content if('IntersectionObserver' in window){var io=new IntersectionObserver(function(es){es.forEach(function(en){if(en.isIntersecting){en.target.style.opacity='1';en.target.style.transform='none';io.unobserve(en.target);}});},{threshold:.05});document.querySelectorAll('.side__box').forEach(function(el){el.style.opacity='0';el.style.transform='translateY(10px)';el.style.transition='opacity .4s ease,transform .4s ease';io.observe(el);});}