19 Vulpeculae
Star in the constellation Vulpecula
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19 Vulpeculae is star located approximately 1,690[1] light years from Earth in the northern constellation of Vulpecula.[9] It is a probable member of the open cluster NGC 6882.[4] This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.40.[2] It is moving closer to the Earth with a heliocentric radial velocity of −19 km/s.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h 11m 47.9738s[1] |
| Declination | 26° 48′ 32.374″[1] |
| Apparent magnitude (V) | 5.40[2] |
| Characteristics | |
| Spectral type | K2 IIIa[3] |
| B−V color index | 1.40[4] |
| Astrometry | |
| Radial velocity (Rv) | −19.33±0.11[4] km/s |
| Proper motion (μ) | RA: 1.619±0.119[1] mas/yr Dec.: −10.600±0.122[1] mas/yr |
| Parallax (π) | 1.9328±0.0779 mas[1] |
| Distance | 1,690 ± 70 ly (520 ± 20 pc) |
| Absolute magnitude (MV) | −2.60[5] |
| Details | |
| Mass | 4.94±0.53[6] M☉ |
| Radius | 100.3+1.7 −3.0[1] R☉ |
| Luminosity | 2,889±145[1] L☉ |
| Surface gravity (log g) | 1.40[7] cgs |
| Temperature | 4,200[7] K |
| Metallicity [Fe/H] | −0.01[7] dex |
| Rotational velocity (v sin i) | < 3.4[8] km/s |
| Other designations | |
| 19 Vul, BD+26° 3825, HD 192004, HIP 99518, HR 7718, SAO 88330[9] | |
| Database references | |
| SIMBAD | data |
This is an aging giant star with a stellar classification of K2 IIIa,[3] having already consumed the hydrogen at its core and evolved away from the main sequence. It has nearly five[6] times the mass of the Sun but has expanded to around 100[1] times the Sun's radius. The star is radiating 2,889[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,200 K.[7]