Star profile

Rho 1 Sagittarii

Variable star

3D likeness based on its real data · class F · ~6,500 K

What is Rho 1 Sagittarii

Rho-1 Sagittarii is a white-yellow subgiant pulsing among the arrows of the Archer, some 127 light-years away. It belongs to the family of Delta Scuti variables, stars that tremble on timescales of hours as they seek equilibrium between gravity and internal pressure. At magnitude 3.9 it is plainly visible to the naked eye on a clean night, one of the few Delta Scuti bright enough to need no instrument at all.

Where it is and when to see it

Rho 1 Sagittarii lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is July, when it culminates around midnight.

From London it culminates about 21° above the horizon.
From New York it culminates about 31° above the horizon.
From Sydney it culminates about 74° above the horizon.

It can be seen from anywhere south of 72° N.

It ranks no. 14 in brightness among the 117 stars of Sagittarius in our catalogue. To find it, start from Kaus Australis, the brightest: it lies about 21° away (a fist at arm's length covers about 10°).

The light you see today left it about 130 years ago.

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Astronomical data for Rho 1 Sagittarii

Constellation: Sagittarius
Apparent magnitude: 3.92
Distance: 127.0 light years
Coordinates (J2000): RA 290.418° · Dec -17.847°
Catalogue: HIP 95168 · HD 181577

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Other stars in Sagittarius

Sagittarius has 117 stars in Stelvia's catalogue. Here are a few of them.

See all 117 stars in Sagittarius