Star profile
HIP 77645
Variable starWhat is HIP 77645
About 2,160 light years away, in the small but southern Norma, a variable blue B-type star burns with unstable vigour. Its light set out around the year 134 AD, in the heart of the Pax Romana, when the Empire under Hadrian was raising walls from Britain to the Danube frontier. Far hotter and more massive than the Sun, it pulses with subtle changes that betray its young and energetic nature. The celestial carpenter's Square, another of the modern constellations sketched by Lacaille, offers it a quiet corner of the southern Milky Way.
Where it is and when to see it
HIP 77645 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 never rises above the horizon.
- From Sydney it culminates about 69° above the horizon.
It can be seen from anywhere south of 35° N.
It ranks no. 18 in brightness among the 26 stars of Norma in our catalogue. To find it, start from Gamma 2 Norma, the brightest: it lies about 7° away (a fist at arm's length covers about 10°).
The light you see today left it about 2,200 years ago.
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Astronomical data for HIP 77645
- Constellation
- Norma
- Apparent magnitude
- 5.74
- Distance
- 2160.3 light years
- Coordinates (J2000)
- RA 237.778° · Dec -55.056°
- Catalogue
- HIP 77645 · HD 141318
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Other stars in Norma
Norma has 26 stars in Stelvia's catalogue. Here are a few of them.
- Gamma 2 Norma4.01
- Epsilon Norma4.46
- Iota 1 Norma4.63
- Iota 2 Norma5.57
- HIP 796895.61
- HIP 806755.67
- HIP 800545.76
- HIP 775625.78