24 Vulpeculae
Red clump giant star in the constellation Vulpecula
From Wikipedia, the free encyclopedia
24 Vulpeculae is a single,[8] yellow-hued star in the northern constellation of Vulpecula. It is faintly visible to the naked eye with an apparent visual magnitude of 5.30.[2] The distance to this star can be estimated from its annual parallax shift of 7.9700±0.0674,[1] which yields a separation of roughly 409 light years. It is moving further away with a heliocentric radial velocity of +15 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h 16m 47.0863s[1] |
| Declination | +24° 40′ 15.965″[1] |
| Apparent magnitude (V) | 5.30[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | G8III[2] |
| B−V color index | 0.951[4] |
| Astrometry | |
| Radial velocity (Rv) | +15.3±0.3[5] km/s |
| Proper motion (μ) | RA: 15.128±0.055[1] mas/yr Dec.: −17.015±0.057[1] mas/yr |
| Parallax (π) | 7.9700±0.0674 mas[1] |
| Distance | 409 ± 3 ly (125 ± 1 pc) |
| Absolute magnitude (MV) | −0.68[2] |
| Details[2] | |
| Mass | 3.41 M☉ |
| Radius | 16[6] R☉ |
| Luminosity | 191 L☉ |
| Surface gravity (log g) | 2.48 cgs |
| Temperature | 4,981 K |
| Metallicity [Fe/H] | −0.06 dex |
| Rotational velocity (v sin i) | 5.02[4] km/s |
| Age | 251 Myr |
| Other designations | |
| 24 Vul, BD+24°4075, FK5 760, HD 192944, HIP 99951, HR 7753, SAO 88451[7] | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star with a stellar classification of G8III,[2] having exhausted the hydrogen at its core and moved off the main sequence. It is a red clump giant, indicating it is presently on the horizontal branch and is generating energy through helium fusion in its core region.[3] The interferometry-measured angular diameter of 24 Vul is 1.08±0.02 mas,[9] which, at its estimated distance, equates to a physical radius of about 16 times the radius of the Sun.[6]
24 Vulpeculae is about 251[2] million years old and is spinning with a projected rotational velocity of 5.02 km/s.[4] It has 3.41 times the mass of the Sun and is radiating 191 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,981 K.[2] This is the probable (99.4% chance) source of X-ray emission coming from these coordinates.[10]
