Star · A2
τ⁷ Ser
τ⁷ Ser is a main-sequence star of spectral type A2 in the constellation Serpens, 174.2 light-years from the Sun.
| Other names | HIP 76878 |
|---|---|
| Constellation | Serpens |
| Distance | 174.2 light-years (53.4 pc) |
| Apparent magnitude | magnitude 5.80 |
| Absolute magnitude | magnitude 2.16 |
| Spectral type | A2 |
| Surface temperature | 8,110 K |
| Luminosity | 12.5 L☉ |
| Radius | 1.79 R☉ |
| Mass | 1.88 M☉ (estimated) |
| Right ascension (J2000) | 15h 41m 54.7s |
| Declination (J2000) | +18° 27′ 51″ |
| Space velocity (relative to the Sun) | 37.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.80). Visible from the whole Northern Hemisphere and south to latitude 72° S. North of latitude 72° N it never sets. 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 1852. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.1 million years.
The Sun seen from there
From a planet around τ⁷ Ser, the Sun would look like a star of magnitude 8.47, in the direction where our sky has the constellation Eridanus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 76408 4.22 light-years
- SDSS J154625.94+160917.9 8.12 light-years
- τ⁵ Ser 9.45 light-years
- HIP 77327 13.1 light-years
- HIP 75437 13.9 light-years
- HIP 77129 14.5 light-years
- HIP 76061 14.5 light-years
- HIP 75446 15.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.