HR 5633, a white main-sequence star in Boötes
HR 5633 is a white main-sequence star in the constellation Boötes. At 247 light years away, it shines at an apparent visual magnitude of 6.03.
HR 5633 (HIP 74000)
HR 5633 is a white main-sequence star in the constellation Boötes. At 247 light years away, it shines at an apparent visual magnitude of 6.03. It is moving through the Galaxy at a speed of 24.5 km/s relative to the Sun.
Sky position: RA 15h 7.3m, Dec +18° 26.5'
Common designations: HR 5633, HD 134064, HIP 74000, Gaia DR3 1211853854683080192
HR 5633 has the spectral type A1Vnn. A-type stars are white stars with surface temperatures of roughly 7,500 to 10,000 K. Their spectra are dominated by strong hydrogen lines, and many of them rotate rapidly. 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 HR 5633 in the sky
HR 5633 lies in Boötes. With a declination of +18° 26.5', it is visible from the entire Northern Hemisphere and from the Southern Hemisphere down to about latitude 72° S. It is just beyond naked-eye visibility; binoculars will show it easily. It is highest in the sky at local midnight around June, which makes the weeks around that month the best time to observe it.
Tabulated data for HR 5633
Astrometry and spectroscopy
| Right Ascension (J2000) | 226.83486894° (15h 7.3m) |
| Declination (J2000) | 18.44182458° (+18° 26.5') |
| Galactic Longitude | 24.64895583° |
| Galactic Latitude | 57.60682275° |
| Proper motion RA | 42.37 mas/yr |
| Proper motion Dec | -49.68 mas/yr |
| Parallax | 13.21 ± 0.03 mas |
| Spectral Type | A1Vnn |
| Radial Velocity | -7.00 km/s |
Photometry
| Band | Magnitude | Abs. Mag. |
|---|---|---|
| B | 6.10 | 1.70 |
| V | 6.03 | 1.63 |
| J | 5.87 | 1.48 |
| H | 5.89 | 1.50 |
| K | 5.87 | 1.48 |
Colour index B-V: +0.07
Derivations
- Heliocentric distance: 75.70 pc (247 light years) (0.2% margin of error)
- Absolute visual magnitude: 1.63
- Transverse velocity: 23.4 km/s
- Space velocity relative to the Sun: 24.5 km/s
- Galactic position (X, Y, Z): 36.9 pc, 16.9 pc, 63.9 pc
- Galactic velocity (U, V, W): 17.1 km/s, -4.2 km/s, -17.0 km/s
Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.