HD 83446
Star in the constellation Vela
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HD 83446 is a probable astrometric binary[10] star system in the constellation Vela. It is visible to the naked eye with an apparent visual magnitude of 4.34.[1] Based upon an annual parallax shift of 30.5 mas,[2] it is located 107.1 light years from the Sun. The system is moving further away with a heliocentric radial velocity of +18 km/s.[6]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela[1] |
| Right ascension | 09h 36m 49.53851s[2] |
| Declination | −49° 21′ 18.0873″[2] |
| Apparent magnitude (V) | 4.34[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A7 V[4] |
| B−V color index | 0.173±0.005[1] |
| Variable type | δ Sct[5] |
| Astrometry | |
| Radial velocity (Rv) | +17.8±0.5[6] km/s |
| Proper motion (μ) | RA: −130.55[2] mas/yr Dec.: +42.98[2] mas/yr |
| Parallax (π) | 30.4562±0.1933 mas[2] |
| Distance | 107.1 ± 0.7 ly (32.8 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.79[1] |
| Details | |
| Mass | 1.8+0.11 −0.09[7] M☉ |
| Luminosity | 15.99[1] L☉ |
| Surface gravity (log g) | 4.3±0.14[7] cgs |
| Temperature | 8,331±283[7] K |
| Rotational velocity (v sin i) | 155[8] km/s |
| Age | 453+256 −278[7] Myr |
| Other designations | |
| M Vel, CD−48°4836, FK5 2768, HD 83446, HIP 47175, HR 3836, SAO 221344[9] | |
| Database references | |
| SIMBAD | data |
The visible component is an A-type main-sequence star with a stellar classification of A7 V.[4] Observations with the BRITE constellation led to this star's identification as a Delta Scuti variable with pulsation frequencies of 31.0806 and 34.2098 cycles per day, corresponding to periods of 46.3 and 42.1 minutes, respectively.[5] It has a high rate of spin with a projected rotational velocity of 155 km/s, which is giving the star an oblate shape with an equatorial bulge that is 6% larger than the polar radius.[8] The star is roughly 453[7] million years old with 1.8[7] times the mass of the Sun. It is radiating 16[1] times the Sun's luminosity from its photosphere at an effective temperature of 8,331 K.[7]