The Horologium constellation
Hor · Catalogue stars: 3
Why this name?
The constellation honours the pendulum clock, an instrument for precise timekeeping needed, among other things, in astronomical observations.
A little history
Lacaille introduced Horologium in the eighteenth century. Its original name on his chart explicitly mentioned the pendulum.
Data
- IAU code
- Hor
- Catalogue stars
- 3
- Messier objects
- 0
- Brightest star
- HIP 19747 · 3.9ᵐ
Stars (HIP)
- HIP 19747 · 3.9ᵐ · K1III
- HIP 19515 · 4.9ᵐ · A9V
- HIP 13884 · 5.0ᵐ · A5III
Altitude above the horizon by latitude
| Latitude | Maximum altitude | Rise azimuth |
|---|---|---|
| +60° | never rises | — |
| +55° | never rises | — |
| +45° | never rises | — |
| +30° | 7° | 157° |
| 0° | 37° | 143° |
| −35° | 72° | 167° |
Geometric altitude at upper culmination, atmospheric refraction not included. Positive latitudes are in the northern hemisphere.
Culmination time by month
| Month | Culmination |
|---|---|
| January | 20:02 |
| February | 17:55 |
| March | 16:10 |
| April | 14:17 |
| May | 12:22 |
| June | 10:16 |
| July | 08:12 |
| August | 06:11 |
| September | 04:18 |
| October | 02:29 |
| November | 00:29 |
| December | 22:20 |
Upper culmination in local solar time — no time-zone or daylight-saving correction applied.
Neighbouring constellations
In brief
Which is the brightest star in Horologium?
HIP 19747 — 3.9ᵐ.