Star profile
Theta 1 Sagittarii
Hot blue starWhat is Theta 1 Sagittarii
Theta-1 Sagittarii shines more than five hundred light-years away toward the very heart of the Milky Way, in the direction Sagittarius aims its arrow. It is a hot blue-white B-type star, a young flame in a sky region thick with dark dust clouds, globular clusters and stellar nurseries. Every one of its photons crosses an ocean of more distant suns before reaching the human eye.
Where it is and when to see it
Theta 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 3° above the horizon.
- From New York it culminates about 14° above the horizon.
- From Sydney it culminates about 89° above the horizon.
It can be seen from anywhere south of 55° N.
It ranks no. 19 in brightness among the 117 stars of Sagittarius in our catalogue. To find it, start from Kaus Australis, the brightest: it lies about 20° away (a fist at arm's length covers about 10°).
The light you see today left it about 520 years ago.
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Astronomical data for Theta 1 Sagittarii
- Constellation
- Sagittarius
- Apparent magnitude
- 4.37
- Distance
- 518.6 light years
- Coordinates (J2000)
- RA 299.934° · Dec -35.276°
- Catalogue
- HIP 98412 · HD 189103
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Other stars in Sagittarius
Sagittarius has 117 stars in Stelvia's catalogue. Here are a few of them.
- Kaus AustralisEpsilon Sagittarii1.79
- NunkiSigma Sagittarii2.05
- AscellaZeta Sagittarii2.60
- RukbatAlpha Sagittarii3.96
- Iota Sagittarii4.12
- Arkab PosteriorBeta 2 Sagittarii4.27
- 62 Sagittarii4.43
- Upsilon Sagittarii4.52