4 Vulpeculae

4 Vulpeculae
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]
Distance260 ± 2 ly
(79.8 ± 0.6 pc)
Absolute magnitude (MV)+0.54[3]
Details
Mass1.72[2] M☉
Radius11.42[1] R☉
Luminosity67.6[2] L☉
Surface gravity (log g)3.01[4] cgs
Temperature4,763±26[2] K
Metallicity [Fe/H]−0.20[4] dex
Rotational velocity (v sin i)2.9[5] km/s
Age2.63[2] Gyr
Other designations
4 Vul, BD+19°4010, Gaia DR2 4515855716012824704, HD 182762, HIP 95498, HR 7385, SAO 104818, WDS J19255+1948A[6]
Database references
SIMBADdata

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.

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]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k l m Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Soubiran2010 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference massarotti2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Kaler was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Baumgardt1998 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).