Back Delta Velorum Afrikaans Delta Velorum AST Delta Velorum BS Delta de la Vela Catalan Delta Velorum Czech Delta Velorum German Delta Velorum Spanish دلتا بادبان Persian Delta Velorum Finnish Delta Velorum French
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| δ Vel A | |
| Right ascension | 08h 44m 42.226s[1] |
| Declination | −54° 42′ 31.76″[1] |
| Apparent magnitude (V) | 1.95 - 2.43[2] |
| δ Vel B | |
| Right ascension | 08h 44m 42.203s[1] |
| Declination | −54° 42′ 30.60″ |
| Apparent magnitude (V) | 5.54[3] |
| Characteristics | |
| U−B color index | +0.07[4] |
| B−V color index | +0.04[4] |
| δ Vel A | |
| Spectral type | A1 Va(n)[5] |
| Variable type | Algol[6] |
| δ Vel B | |
| Spectral type | F7.5V[7] |
| Astrometry | |
| Radial velocity (Rv) | +2.2[8] km/s |
| Proper motion (μ) | RA: +28.99[9] mas/yr Dec.: −103.35[9] mas/yr |
| Parallax (π) | 40.49 ± 0.39 mas[9] |
| Distance | 80.6 ± 0.8 ly (24.7 ± 0.2 pc) |
| Absolute magnitude (MV) | 0.02/3.60[10] |
| Orbit[7] | |
| Primary | δ Vel A |
| Companion | δ Vel B |
| Period (P) | 143.2 yr |
| Semi-major axis (a) | 1.996″ |
| Eccentricity (e) | 0.475 |
| Inclination (i) | 105.1° |
| Orbit[7] | |
| Primary | δ Vel Aa |
| Companion | δ Vel Ab |
| Period (P) | 45.1503 days |
| Semi-major axis (a) | 0.01651″ |
| Eccentricity (e) | 0.287 |
| Inclination (i) | 89.04° |
| Details | |
| δ Vel Aa | |
| Mass | 2.43[7] M☉ |
| Radius | 2.79–2.97[7] R☉ |
| Luminosity | 67[7] L☉ |
| Surface gravity (log g) | 3.78–3.90[7] cgs |
| Temperature | 9,440[7] K |
| Metallicity [Fe/H] | −0.33[7] dex |
| Rotation | 1.05[7] days |
| Rotational velocity (v sin i) | 143.5[7] km/s |
| δ Vel Ab | |
| Mass | 2.27[7] M☉ |
| Radius | 2.37–2.52[7] R☉ |
| Luminosity | 51[7] L☉ |
| Surface gravity (log g) | 3.99–4.10[7] cgs |
| Temperature | 9,830[7] K |
| Metallicity [Fe/H] | −0.33[7] dex |
| Rotational velocity (v sin i) | 149.6[7] km/s |
| Age | 400 million[10] years |
| δ Vel B | |
| Mass | 1.35–1.46[7] M☉ |
| Radius | 1.43[7] R☉ |
| Luminosity | 3.5[7] L☉ |
| Temperature | 6,600[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Velorum (δ Velorum, abbreviated Delta Vel, δ Vel) is a triple star system in the southern constellation of Vela, near the border with Carina, and is part of the False Cross. Based on parallax measurements, it is approximately 80.6 light-years (24.7 parsecs) from the Sun. It is one of the stars that at times lies near the south celestial pole due to precession.
δ Velorum consists of an eclipsing binary, designated Delta Velorum A, and a more distant third companion, Delta Velorum B. δ Velorum A's two components are themselves designated Aa (officially named Alsephina /ælsɪˈfaɪnə/, the traditional name for the entire system) and Ab.
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