9 Vulpeculae
Star in the constellation Vulpecula
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9 Vulpeculae is a star in the northern constellation of Vulpecula, located about 560 light years away based on parallax. It is visible to the naked eye as a faint, blue-white hued star with a baseline apparent visual magnitude of 5.01. The star is moving further from the Earth with a heliocentric radial velocity of +5 km/s.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 34m 34.89705s[1] |
| Declination | 19° 46′ 24.2423″[1] |
| Apparent magnitude (V) | 5.010±0.009[2] (4.99 - 5.08)[3] |
| Characteristics | |
| Spectral type | B8 IIIn[4] |
| Apparent magnitude (U) | 4.499±0.012[2] |
| Apparent magnitude (B) | 4.906±0.011[2] |
| Variable type | suspected[3] |
| Astrometry | |
| Radial velocity (Rv) | +5.00[5] km/s |
| Proper motion (μ) | RA: +13.148[1] mas/yr Dec.: +5.142[1] mas/yr |
| Parallax (π) | 5.8317±0.1242 mas[1] |
| Distance | 560 ± 10 ly (171 ± 4 pc) |
| Absolute magnitude (MV) | −1.14[6] |
| Details | |
| Mass | 3.5[7] M☉ |
| Radius | 2.8[8] R☉ |
| Luminosity | 216[8] L☉ |
| Surface gravity (log g) | 3,54[7] cgs |
| Temperature | 12,042[7] K |
| Metallicity [Fe/H] | −0.03[7] dex |
| Rotational velocity (v sin i) | 185[9] km/s |
| Age | 185[10] Myr |
| Other designations | |
| 9 Vul, NSV 12173, BD+19°4063, GC 27047, HD 184606, HIP 96275, HR 7437, SAO 104990, WDS J19346+1946A[11] | |
| Database references | |
| SIMBAD | data |
This a B-type star with a stellar classification of B8 IIIn,[4] where the 'n' notation indicates "nebulous" lines due to rapid rotation. It has a high rate of spin with a projected rotational velocity of 185 km/s.[9] The star is radiating 216 times the Sun's luminosity from its photosphere at an effective temperature of 12,042 K. This is a suspected variable star of unknown type, ranging in magnitude from 4.99 down to 5.08.[3]
9 Vulpeculae has two reported companions: component B, with a separation of 9.3" and magnitude 13.4, and C, with a separation of 108" and a magnitude of 12.5".[12][4] Both are unrelated background objects.[13][14]