Propus
star · Gemini · 3.3ᵐ
Red star in Gemini.
Notable facts
The light you see today left Propus around the year 1641.
About 12 times brighter than the faintest star visible to the naked eye.
In brief
Which constellation is Propus in?
Propus lies in Gemini.
Is Propus visible to the naked eye?
3.3ᵐ — visible to the naked eye (under dark skies).
When is the best time to observe Propus?
Best observed in December.
Data
- RA / Dec (J2000)
- 6h 15m · +22° 30′
- Type
- star
- Constellation
- Gemini
- How to observe
- 3.3ᵐ — visible to the naked eye (under dark skies)
- Spectral class
- M3III — red star
- Absolute magnitude
- -2.0ᵐ
- Luminosity
- ≈565 × the Sun
- Distance
- ~385 light years
- Designation
- HIP 29655
Observing tip
Stars stay points at any magnification: aim your telescope for colour, brightness and companions, not detail.
Altitude above the horizon by latitude
| Latitude | Maximum altitude | Rise azimuth |
|---|---|---|
| +60° | 53° | 40° |
| +55° | 58° | 48° |
| +45° | 68° | 57° |
| +30° | 83° | 64° |
| 0° | 67° | 67° |
| −35° | 32° | 62° |
Geometric altitude at upper culmination, atmospheric refraction not included. Positive latitudes are in the northern hemisphere.
Culmination time by month
| Month | Culmination |
|---|---|
| January | 22:29 |
| February | 20:22 |
| March | 18:37 |
| April | 16:43 |
| May | 14:49 |
| June | 12:43 |
| July | 10:39 |
| August | 08:38 |
| September | 06:45 |
| October | 04:56 |
| November | 02:56 |
| December | 00:47 |
Upper culmination in local solar time — no time-zone or daylight-saving correction applied.