A story about seeing something like a will-o'-the-wisp when I was little

This happened when I was in elementary school. That night, my dad took me to a nearby river to see fireflies. I finished getting ready quickly and was waiting for my dad in front of the house. With nothing else to do, I was gazing up at the sky when I saw something like a pink fireball floating around. I thought it was a shooting star, but it was clearly moving slowly and glowing pink. By the time my dad finished getting ready and brought my brother, it had disappeared. I still find it mysterious.