HD 228132, a yellow-white main-sequence star in Cygnus
HD 228132 is a yellow-white main-sequence star in the constellation Cygnus. At 544 light years away, it shines at an apparent visual magnitude of 9.33.
HD 228132 (HIP 99440)
HD 228132 is a yellow-white main-sequence star in the constellation Cygnus. At 544 light years away, it shines at an apparent visual magnitude of 9.33. It is moving through the Galaxy at a speed of 12.9 km/s relative to the Sun.
Sky position: RA 20h 11.0m, Dec +32° 50.7'
Common designations: HD 228132, HIP 99440, Gaia DR3 2054993627535341952
HD 228132 has the spectral type F4V. 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 HD 228132 in the sky
HD 228132 lies in Cygnus. With a declination of +32° 50.7', it is visible from the entire Northern Hemisphere and from the Southern Hemisphere down to about latitude 57° S. Observers poleward of latitude 57° N see it as circumpolar: it never sets. A telescope is needed to see it. It is highest in the sky at local midnight around August, which makes the weeks around that month the best time to observe it.
Tabulated data for HD 228132
Astrometry and spectroscopy
| Right Ascension (J2000) | 302.75181743° (20h 11.0m) |
| Declination (J2000) | 32.84566771° (+32° 50.7') |
| Galactic Longitude | 70.74392110° |
| Galactic Latitude | -0.40654608° |
| Proper motion RA | -3.74 mas/yr |
| Proper motion Dec | 8.61 mas/yr |
| Parallax | 5.99 ± 0.02 mas |
| Spectral Type | F4V |
| Radial Velocity | 10.52 km/s |
Photometry
| Band | Magnitude | Abs. Mag. |
|---|---|---|
| B | 9.69 | 3.58 |
| V | 9.33 | 3.22 |
| J | 8.47 | 2.36 |
| H | 8.28 | 2.17 |
| K | 8.25 | 2.14 |
Colour index B-V: +0.36
Derivations
- Heliocentric distance: 166.92 pc (544 light years) (0.3% margin of error)
- Absolute visual magnitude: 3.22
- Transverse velocity: 7.4 km/s
- Space velocity relative to the Sun: 12.9 km/s
- Galactic position (X, Y, Z): 55.0 pc, 157.6 pc, -1.2 pc
- Galactic velocity (U, V, W): -0.4 km/s, 11.3 km/s, 6.1 km/s
Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.