Trojan (celestial body) Trojan (celestial body) In astronomy, a trojan is a minor planet or moon that shares the orbit of a planet or larger moon, wherein the trojan remains in the same, stable position relative to the larger object. In particular, a trojan remains near one of the two trojan points of stability – designated and – which lie approximately 60° ahead of and behind the larger body, respectively. Trojan points make up two of five types of Lagrangian points, and a trojan is a type of Lagrangian object. They are one type of co-orbital object. In this arrangement, the massive star
Celestial monarch Celestial monarch The celestial monarch ("Hypothymis coelestis") is a species of bird in the family Monarchidae, and one of the most attractive of all the monarch flycatchers, with its spectacular blue crest and large yellow eye-ring (neither of which are illustrated in the facing painting). It is endemic to the Philippines. An alternate name for the celestial monarch is the celestial blue monarch. Two subspecies are recognized: Its natural habitat is subtropical or tropical moist lowland forests. This beautiful insectivore is declining rapidly, with recent surveys revealing its presence at only 10 sites. Widespread and continuing reduction of its lowland