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Star in the constellation Vulpecula From Wikipedia, the free encyclopedia
4 Vulpeculae is a single,[7] orange-hued star in the northern constellation of Vulpecula. It forms part of the asterism, formerly thought to be an open cluster, called the coathanger or Brocchi's Cluster.[8][9] The star is faintly visible to the naked eye with an apparent visual magnitude of 5.16.[2] The distance to this star, based upon an annual parallax shift of 12.5320±0.1008 mas,[1] is around 260 light years.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vulpecula |
Right ascension | 19h 25m 28.6030389750s[1] |
Declination | +19° 47′ 54.059820728″[1] |
Apparent magnitude (V) | 5.16[2] |
Characteristics | |
Spectral type | K0 III[2] |
B−V color index | +0.980[2] |
Astrometry | |
Radial velocity (Rv) | +0.95 ± 0.12[1] km/s |
Proper motion (μ) | RA: +87.392 ± 0.137[1] mas/yr Dec.: -73.038 ± 0.152[1] mas/yr |
Parallax (π) | 12.5320 ± 0.1008 mas[1] |
Distance | 260 ± 2 ly (79.8 ± 0.6 pc) |
Absolute magnitude (MV) | +0.54[3] |
Details | |
Mass | 1.72[2] M☉ |
Radius | 11.42[1] R☉ |
Luminosity | 67.6[2] L☉ |
Surface gravity (log g) | 3.01[4] cgs |
Temperature | 4,763±26[2] K |
Metallicity [Fe/H] | −0.20[4] dex |
Rotational velocity (v sin i) | 2.9[5] km/s |
Age | 2.63[2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
At the age of about 2.6 billion years old,[2] this is an aging giant star with a stellar classification of K0 III,[2] having exhausted the supply of hydrogen at its core and evolved off the main sequence. It is now a red clump giant, indicating that it is on the horizontal branch and is generating energy through the fusion of helium at its core.[10] The star has an estimated 1.72[2] times the mass of the Sun and has expanded to 11.42[1] times the Sun's radius. It is radiating 67.6[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,763 K.[2]