When is the best time to observe Zubenelhakrabi?

Zubenelhakrabi is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is Zubenelhakrabi located in the sky?

Zubenelhakrabi lies in the constellation てんびん at right ascension 15h 36m and declination -14° 47′.

What telescope do I need to split Zubenelhakrabi?

Splitting Zubenelhakrabi requires an aperture of roughly 60 mm or larger — the components are separated by about 41.9″ at magnitudes near 3.9. The companion is about 7.3 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Zubenelhakrabi — てんびんの二重星

HIP 76333; Gamma Librae; 38 Librae

等級 3.9^m DoubleStar てんびん (Lib) 可視 2 Exoplanets

星図 + リスト + 計画

Zubenelhakrabiについて

説明

Zubenelhakrabi, Gamma Librae, is a G-type giant of spectral class G8.5 III about 163 light-years away in the constellation Libra. It shines at magnitude 3.91 and is a red-clump star actively fusing helium. Zubenelhakrabi has a mass of about 1.5 Suns and a radius of about 11 Suns.

観測のコツ

Zubenelhakrabi sits on the southern side of Libra, south of the main pan-and-scale pattern. In binoculars it appears as a warm yellow point. Best observed April through August.

歴史

The name Zubenelhakrabi comes from the Arabic "zubān al-'aqrab," meaning "the claw of the scorpion" — Libra's stars were originally part of Scorpius in Greek astronomy, representing the scorpion's claws, and only later reinterpreted as the scales of justice. The name preserves this ancient scorpion-claws identity. The IAU adopted the name in 2017.

豆知識

Libra is unique among the zodiac constellations in that it originally was not a separate figure — its stars were the claws of Scorpius in Babylonian and Greek tradition. The Romans separated them into a distinct "Scales" constellation around the 1st century BC. The surviving Arabic names (Zubenelgenubi, Zubeneschamali, Zubenelhakrabi) all still reference the scorpion claws.

観測

1物理的性質

等級 3.91

スペクトル型 G8.5III 巨星

星の色橙 (B-V 1.01)

距離 163 ly

2位置と識別子

RA 15h 35m 31.6s

Dec -14° 47' 22.0"

星座てんびん (Lib)

HR 5787

HIP 76333

HD 138905

SAO 159370

Bayer Gamma

Flamsteed 38 Lib

Double Cat 9704

SIMBAD Wikipedia

3分離しやすさ

主星 3.9 mag 伴星 11.2 mag 離角 41.9″

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望遠鏡	ボートル3	ボートル4	ボートル5
80 mm 屈折 80mm 屈折	困難+	困難	極難+
150 mm ニュートン 150mm ニュートン	普通+	普通	困難+
Celestron C8 (203 mm SCT) C8 203mm	容易	普通+	普通