When is the best time to observe Muscida?

Muscida is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is Muscida located in the sky?

Muscida lies in the constellation おおぐま at right ascension 08h 30m and declination +60° 43′.

What telescope do I need to split Muscida?

Splitting Muscida requires an aperture of roughly 60 mm or larger — the components are separated by about 141.1″ at magnitudes near 3.4. The companion is about 7.6 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Muscida — おおぐまの二重星

1 UMa

DoubleStar おおぐま (UMa) 可視 1 Exoplanet

星図 + リスト + 計画

Muscidaについて

説明

Muscida, 1 Ursae Majoris (also known as Omicron UMa), is a yellow giant of spectral type G5 III about 179 light-years away. It marks the nose of the Great Bear, at the western end of the constellation. The star hosts a confirmed exoplanet, Muscida b, a gas giant of about 4.1 Jupiter masses in a 1630-day orbit. Muscida's magnitude of 3.36 makes it an easy naked-eye object even from suburban skies.

観測のコツ

Muscida is easy to find: follow the "top" of the Bear's head westward from the Big Dipper's bowl, and Muscida is the first naked-eye star you reach. It appears distinctly yellow in binoculars. Circumpolar from mid-northern latitudes. Best observed in late winter and spring when Ursa Major rides high.

歴史

The name Muscida comes from the Latin word for "muzzle" or "snout," perfectly describing the star's position on the bear's nose. The exoplanet Muscida b was discovered in 2012 via radial velocity measurements and is one of the closer super-Jupiters to us in the planetary catalog.

豆知識

Muscida and its nearby fainter neighbors form a loose grouping that helps new skywatchers understand the full outline of the Great Bear — most of whose body extends well beyond the familiar seven Dipper stars. The planet Muscida b, at roughly 3.9 AU from the star, receives about half the flux that Earth gets from the Sun — despite orbiting a much more luminous giant.

観測

1物理的性質

等級 3.36

スペクトル型 G5III:

星の色橙 (B-V 0.84)

距離 179 ly

2位置と識別子

RA 08h 30m 15.9s

Dec +60° 43' 05.0"

星座おおぐま (UMa)

HR 3323

HIP 41704

HD 71369

Flamsteed 1 UMa

Double Cat 6830

SIMBAD Wikipedia

3分離しやすさ

主星 3.4 mag 伴星 11.0 mag 離角 141.1″

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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+	普通
Celestron C8 (203 mm SCT) C8 203mm	容易	普通+	普通+