HD 16004
Cmeically peculiar B-type star in the constellation Andromeda
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HD 16004 is blue-white hued star in the northern constellation of Andromeda. It is a challenge to see with the naked eye even under good viewing conditions, having an apparent visual magnitude of 6.26.[3] Located approximately 660 light-years (202 parsecs) away from the Sun based on parallax, it is drifting closer with a heliocentric radial velocity of −7 km/s.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 02h 35m 27.90126s[2] |
| Declination | +39° 39′ 51.7705″[2] |
| Apparent magnitude (V) | 6.26[3] |
| Characteristics | |
| Spectral type | B9.5 III HgMn[3] |
| U−B color index | −0.33[3] |
| B−V color index | −0.30[3] |
| Astrometry | |
| Radial velocity (Rv) | −6.8±1.1[4] km/s |
| Proper motion (μ) | RA: +16.659[2] mas/yr Dec.: −34.296[2] mas/yr |
| Parallax (π) | 4.9384±0.1650 mas[2] |
| Distance | 660 ± 20 ly (202 ± 7 pc) |
| Absolute magnitude (MV) | −0.36[5] |
| Details | |
| Mass | 2.88[6] M☉ |
| Radius | 3.274[7] R☉ |
| Luminosity | 158[7] L☉ |
| Surface gravity (log g) | 3.8[6] cgs |
| Temperature | 10,809[6] K |
| Metallicity [Fe/H] | −0.17[6] dex |
| Rotational velocity (v sin i) | 30[8] km/s |
| Age | 162[9] Myr |
| Other designations | |
| BD+39°573, GC 3093, HD 16004, HIP 12057, HR 746, SAO 55680, WDS J02355+3940A[10] | |
| Database references | |
| SIMBAD | data |
This is a chemically peculiar mercury-manganese star[11] with a stellar classification of B9.5 III HgMn.[3] It is an estimated 162 million years old and is spinning with a projected rotational velocity of 30 km/s.[8] The star is radiating 158 times the luminosity of the Sun from its photosphere at an effective temperature of 10,809 K.