v1 Puppis, a blue-white subgiant star in Puppis
v1 Puppis is a blue-white subgiant star in the constellation Puppis. At 933 light years away, it shines at an apparent visual magnitude of 4.67.
v1 Puppis (HIP 35363)
v1 Puppis is a blue-white subgiant star in the constellation Puppis. At 933 light years away, it shines at an apparent visual magnitude of 4.67. It is moving through the Galaxy at a speed of 24.7 km/s relative to the Sun.
Sky position: RA 7h 18.3m, Dec -36° 44.0'
Common designations: v1 Puppis, Upsilon-1 Puppis, NV Puppis, HR 2787, HD 57150, Gaia DR3 5589411172768195840, HIP 35363
v1 Puppis has the spectral type B2V+B3IVne. B-type stars are hot (about 10,000 to 30,000 K), luminous and blue-white. They are massive, short-lived stars, typically only tens of millions of years old, and are common in young clusters and OB associations. Its luminosity class IV marks it as a subgiant: it has exhausted hydrogen in its core and is beginning to expand toward the giant phase.
How to find v1 Puppis in the sky
v1 Puppis lies in Puppis. With a declination of -36° 44.0', it is visible from the entire Southern Hemisphere and from the Northern Hemisphere up to about latitude 53° N. Observers poleward of latitude 53° 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 February, which makes the weeks around that month the best time to observe it.
Tabulated data for v1 Puppis
Astrometry and spectroscopy
| Right Ascension (J2000) | 109.57663991° (7h 18.3m) |
| Declination (J2000) | -36.73395237° (-36° 44.0') |
| Galactic Longitude | 248.77975322° |
| Galactic Latitude | -10.91168906° |
| Proper motion RA | -10.45 mas/yr |
| Proper motion Dec | 5.94 mas/yr |
| Parallax | 3.50 ± 0.15 mas |
| Spectral Type | B2V+B3IVne |
| Radial Velocity | 18.60 km/s |
Photometry
| Band | Magnitude | Abs. Mag. |
|---|---|---|
| U | 3.78 | -3.50 |
| B | 4.57 | -2.71 |
| V | 4.67 | -2.61 |
| R | 4.57 | -2.71 |
| I | 4.62 | -2.66 |
| J | 4.81 | -2.47 |
| H | 4.67 | -2.62 |
| K | 4.52 | -2.77 |
Colour index B-V: -0.10
Derivations
- Heliocentric distance: 286.02 pc (933 light years) (4.4% margin of error)
- Absolute visual magnitude: -2.61
- Transverse velocity: 16.3 km/s
- Space velocity relative to the Sun: 24.7 km/s
- Galactic position (X, Y, Z): -101.7 pc, -261.8 pc, -54.1 pc
- Galactic velocity (U, V, W): -18.5 km/s, -10.5 km/s, -12.6 km/s
Data: Extended Hipparcos Compilation (XHIP) and SIMBAD.