| Donor | HD_77581 | Hiltner (1973) |
| Other Names | GP Vel, HIC 44368 | |
| Spectral Type | B0.5Iab | Nagase et al. (1986) |
| Mass | 23.5(+2.2,-1.5) Msun | van Kerkwijk et al. (1995) |
| Radius | 30(+1.8,-1.9) Rsun | van Kerkwijk et al. (1995) |
| Luminosity | 1.3x1039 erg/s | Nagase et al. (1986) |
| Teff | 25000(1000) K | Sadakane et al. (1985) |
| Rotation | 13.5 d | Zuiderwijk (1995) |
| Wind | 4x10-6 M/yr | Nagase et al. (1986) |
| Terminal Wind Velocity | 1700 km/s | Nagase et al. (1986) |
| Magnitude U | 8.2 | Nagase et al. (1986) |
| Magnitude B | 5.2 | Nagase et al. (1986) |
| Magnitude V | 3.2 | Nagase et al. (1986) |
| Magnitude R | 6.2 | Nagase et al. (1986) |
| Last modification date: Fri Aug 3 01:06:20 2007 |