25 Vulpeculae

25 Vulpeculae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vulpecula
Right ascension 20h 22m 03.43076s[1]
Declination +24° 26′ 45.9526″[1]
Apparent magnitude (V) 5.50[2]
Characteristics
Spectral type B6 IVe[3][4]
B−V color index −0.09±0.02[4]
Astrometry
Radial velocity (Rv)−11.0±3.6[5] km/s
Proper motion (μ) RA: +0.605[1] mas/yr
Dec.: −5.732[1] mas/yr
Parallax (π)2.7932 ± 0.1493 mas[1]
Distance1,170 ± 60 ly
(360 ± 20 pc)
Absolute magnitude (MV)−1.88[4]
Details
Mass7±1[6] M☉
Radius11±1[6] R☉
Luminosity (bolometric)1,345+215
−184[7] L☉
Surface gravity (log g)3.52±0.21[7] cgs
Temperature13,170±330[7] K
Rotational velocity (v sin i)160±14[7] km/s
Other designations
25 Vul, BD+23°3986, HD 193911, HIP 100435, HR 7789, SAO 88580[8]
Database references
SIMBADdata

25 Vulpeculae is a single[2] star in the northern constellation of Vulpecula, located roughly 1,170 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.50[2] This object is moving closer to the Earth with a heliocentric radial velocity of −11 km/s.[5]

This is a Be star with a stellar classification of B6 IVe,[3] matching the spectrum of an aging subgiant with a circumstellar disk of ionized gas. Cowley (1972) had it rated as a more evolved giant star with a class of B8 IIIn,[9] where the 'n' notation indicates "nebulous" lines due to rapid rotation. It has a high rate of spin, showing a projected rotational velocity of 160 km/s.[7] The star has 7 times the mass of the Sun and 11 times the Sun's radius.[6] It is radiating 1,345 times the luminosity of the Sun from its photosphere at an effective temperature of 13,170 K.[7]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference slettebak1982 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Vieira2017 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Zorec2016 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Cowley1972 was invoked but never defined (see the help page).