Star · A4V
4 Ser
4 Ser is a main-sequence star of spectral type A4V in the constellation Serpens, 154.0 light-years from the Sun.
| Other names | HIP 74689 |
|---|---|
| Constellation | Serpens |
| Distance | 154.0 light-years (47.2 pc) |
| Apparent magnitude | magnitude 5.62 |
| Absolute magnitude | magnitude 2.25 |
| Spectral type | A4V |
| Surface temperature | 8,310 K |
| Luminosity | 11.7 L☉ |
| Radius | 1.65 R☉ |
| Mass | 1.85 M☉ (estimated) |
| Right ascension (J2000) | 15h 15m 49.1s |
| Declination (J2000) | +0° 22′ 20″ |
| Space velocity (relative to the Sun) | 26.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.62). Visible from the whole Southern Hemisphere and north to latitude 90° N. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1872. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.7 million years.
The Sun seen from there
From a planet around 4 Ser, the Sun would look like a star of magnitude 8.20, in the direction where our sky has the constellation Cetus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 74164 7.37 light-years
- ULAS J151637.89+011050.1 7.54 light-years
- HD 136118 12.2 light-years
- Gl 579.3 12.5 light-years
- HIP 75069 14.2 light-years
- HIP 76031 16.3 light-years
- ULAS J154038.87-001256.7 17.0 light-years
- HIP 72663 18.1 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.