q1 Eridani, a yellow-white main-sequence star in Eridanus
q1 Eridani is a yellow-white main-sequence star in the constellation Eridanus. At 57 light years away, it shines at an apparent visual magnitude of 5.52.
q1 Eridani (HIP 7978)
q1 Eridani is a yellow-white main-sequence star in the constellation Eridanus. At 57 light years away, it shines at an apparent visual magnitude of 5.52. It is moving through the Galaxy at a speed of 32.0 km/s relative to the Sun.
Sky position: RA 1h 42.5m, Dec -53° 44.4'
Common designations: q1 Eridani, HR 506, HD 10647, GJ 3109, HIP 7978, Gaia DR3 4912580642524184960
q1 Eridani has the spectral type F9V. F-type stars are yellow-white stars of about 6,000 to 7,500 K, slightly hotter and more massive than the Sun. Their hydrogen lines are weaker than in A stars and metal lines become prominent. Its luminosity class V means it is a main-sequence (dwarf) star, still fusing hydrogen into helium in its core like the Sun.
How to find q1 Eridani in the sky
q1 Eridani lies in Eridanus. With a declination of -53° 44.4', it is visible from the entire Southern Hemisphere and from the Northern Hemisphere up to about latitude 36° N. Observers poleward of latitude 36° S see it as circumpolar: it never sets. It is bright enough to see with the naked eye under dark skies. It is highest in the sky at local midnight around November, which makes the weeks around that month the best time to observe it.
Tabulated data for q1 Eridani
Astrometry and spectroscopy
| Right Ascension (J2000) | 25.62214382° (1h 42.5m) |
| Declination (J2000) | -53.74083096° (-53° 44.4') |
| Galactic Longitude | 286.89736767° |
| Galactic Latitude | -61.76941519° |
| Proper motion RA | 166.04 mas/yr |
| Proper motion Dec | -105.50 mas/yr |
| Parallax | 57.64 ± 0.05 mas |
| Spectral Type | F9V |
| Radial Velocity | 27.66 km/s |
Photometry
| Band | Magnitude | Abs. Mag. |
|---|---|---|
| B | 6.05 | 4.85 |
| V | 5.52 | 4.32 |
| J | 4.79 | 3.59 |
| H | 4.40 | 3.20 |
| K | 4.34 | 3.14 |
Colour index B-V: +0.53
Derivations
- Heliocentric distance: 17.35 pc (57 light years) (0.1% margin of error)
- Absolute visual magnitude: 4.32
- Transverse velocity: 16.2 km/s
- Space velocity relative to the Sun: 32.0 km/s
- Galactic position (X, Y, Z): 2.4 pc, -7.9 pc, -15.3 pc
- Galactic velocity (U, V, W): -1.2 km/s, -26.5 km/s, -18.0 km/s
Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.