準じゅん恒こう星せい状じょう天てん体たい

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Meanings

Rare, technical term in astronomy. In modern Japanese, クエーサー is far more common.

クエーサー
The common modern term for 'quasar'. 準恒星状天体 is a rare, formal Japanese equivalent used mainly in older or very technical contexts.

Compound of 準 (quasi-), 恒星 (fixed star), 状 (-shaped), and 天体 (celestial body). A calque of English 'quasi-stellar object'.