Star profile
Delta Lupi
Variable starWhat is Delta Lupi
Delta Lupi pulses every four hours. A Beta Cephei variable, this blue subgiant twelve times more massive than the Sun breathes with a steady cycle of 0.1655 days. It belongs to the Upper-Centaurus Lupus subgroup of the Scorpius-Centaurus association, the nearest cluster of massive stars to our own, and at fifteen million years old it is already drifting from the main sequence. Its light has been crossing space for 884 years.
Where it is and when to see it
Delta Lupi lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is May, when it culminates around midnight.
- From London it never rises above the horizon.
- From New York it culminates about 9° above the horizon.
- From Sydney it culminates about 83° above the horizon.
It can be seen from anywhere south of 49° N.
It ranks no. 4 in brightness among the 74 stars of Lupus in our catalogue. To find it, start from Alpha Lupi, the brightest: it lies about 10° away (a fist at arm's length covers about 10°).
The light you see today left it about 880 years ago.
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Astronomical data for Delta Lupi
- Constellation
- Lupus
- Apparent magnitude
- 3.22
- Distance
- 884.0 light years
- Coordinates (J2000)
- RA 230.343° · Dec -40.648°
- Catalogue
- HIP 75141 · HD 136298
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Other stars in Lupus
Lupus has 74 stars in Stelvia's catalogue. Here are a few of them.
- Alpha Lupi2.30
- Beta Lupi2.68
- Gamma Lupi2.80
- Epsilon Lupi3.37
- Zeta Lupi3.41
- Eta Lupi3.42
- Iota Lupi3.55
- Phi 1 Lupi3.57