Star profile
Delta 1 Telescopium
Hot blue starWhat is Delta 1 Telescopium
Delta-1 Telescopii is a B6 blue subgiant locked in a spectroscopic pair with a companion invisible to telescopes: only the periodic shift of her spectral lines reveals it. She shines with the strength of some 800 Suns at 708 light-years, in a constellation Lacaille invented in the 18th century to honour the instrument then revolutionising astronomy. Fitting: she is hotter than any glass could bear.
Where it is and when to see it
Delta 1 Telescopium lies in the southern 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 never rises above the horizon.
- From New York it culminates about 3° above the horizon.
- From Sydney it culminates about 78° above the horizon.
It can be seen from anywhere south of 44° N.
It ranks no. 6 in brightness among the 27 stars of Telescopium in our catalogue. To find it, start from Alpha Telescopium, the brightest: it lies about 1° away (a fist at arm's length covers about 10°).
The light you see today left it about 710 years ago.
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A public signature from a real person. The chosen name is a symbolic denomination within Stelvia, with no official standing or IAU recognition: the sky is not for sale and belongs to no one.
Astronomical data for Delta 1 Telescopium
- Constellation
- Telescopium
- Apparent magnitude
- 4.92
- Distance
- 707.6 light years
- Coordinates (J2000)
- RA 277.939° · Dec -45.915°
- Catalogue
- HIP 90830 · HD 170465
A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.
Other stars in Telescopium
Telescopium has 27 stars in Stelvia's catalogue. Here are a few of them.
- Alpha Telescopium3.49
- Zeta Telescopium4.10
- Epsilon Telescopium4.52
- Lambda Telescopium4.85
- Iota Telescopium4.88
- Xi Telescopium4.93
- Eta Telescopium5.03
- Delta 2 Telescopium5.07