Star profile

109 Herculis

3D likeness based on its real data · class K · ~4,200 K

What is 109 Herculis

Catalogued as 109 Herculis, this orange K2 giant glows from roughly 119 light-years away, in a quiet region of Hercules. The light arriving now at our telescopes left around the time Pasteur was born, well before modern astrophysics took shape. At magnitude 3.85 it can be glimpsed with the unaided eye under dark skies, a warm orange pinpoint among the constellation's fainter stars in the body of the kneeling hero.

Where it is and when to see it

109 Herculis lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is June, when it culminates around midnight.

From London it culminates about 60° above the horizon.
From New York it culminates about 71° above the horizon.
From Sydney it culminates about 34° above the horizon.

It can be seen from anywhere north of 68° S.

It ranks no. 12 in brightness among the 136 stars of Hercules in our catalogue. To find it, start from Kornephoros, the brightest: it lies about 26° away (a fist at arm's length covers about 10°).

The light you see today left it about 120 years ago.

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Astronomical data for 109 Herculis

Constellation: Hercules
Apparent magnitude: 3.85
Distance: 119.0 light years
Coordinates (J2000): RA 275.925° · Dec 21.770°
Catalogue: HIP 90139 · HD 169414

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Other stars in Hercules

Hercules has 136 stars in Stelvia's catalogue. Here are a few of them.

See all 136 stars in Hercules