アメリカ自然史博物館のインスタグラム(amnh) - 6月30日 07時04分

Get out your telescopes! Jupiter is prominent in the night sky this month along with bright stars of the summer triangle. The waxing Moon returns to Jupiter’s vicinity in the southern sky on the evening of Friday June 30th. The pair will appear during evening twilight with a five degree angular separation, and the span diminishes as hours pass. If your sky is clear it will be a good evening to telescopically explore a lovely scene—the nearly first quarter Moon, Jupiter, its four major satellites, and the star Porrima in the constellation Virgo.
Until the start of this century Porrima was a showpiece double star, separable into its components even in modest backyard telescopes. However, the pair was at closest orbital separation in 2007, and currently requires a substantial telescope to resolve. We’ll have to wait about half a decade before this binary again appears as two stars in most telescopes.

Third magnitude Porrima will be positioned just east of the dark lunar edge during early evening of June 30, later it will be occulted behind the eastward orbiting Moon at about 10:50 p.m. for observers in New York City. At about 11:55 p.m. EDT, the Moon moves past the star’s direction, but emerging at the bright lunar limb, seeing Porrima then will be a challenge. #jupiter #amnh #planet #astronomy #cosmos #nightsky #nasa #naturalhistory #gasgiant

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