8 Vulpeculae

8 Vulpeculae

α and 8 Vulpeculae form a pair at top center
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vulpecula
Right ascension 19h 28m 57.08327s[1]
Declination 24° 46′ 07.2656″[1]
Apparent magnitude (V) 5.82[2]
Characteristics
Spectral type K0 III[3]
B−V color index 1.023±0.005[2]
Astrometry
Radial velocity (Rv)−28.58±0.20[2] km/s
Proper motion (μ) RA: 8.750[1] mas/yr
Dec.: 16.334[1] mas/yr
Parallax (π)7.1397 ± 0.0739 mas[1]
Distance457 ± 5 ly
(140 ± 1 pc)
Absolute magnitude (MV)−0.16[2]
Details
Mass3.07[4] M☉
Radius13.8+0.2
−0.4[1] R☉
Luminosity100.5±1.3[1] L☉
Surface gravity (log g)2.63[4] cgs
Temperature4,915+71
−30[1] K
Metallicity [Fe/H]+0.11[4] dex
Age324[5] Myr
Other designations
8 Vul, BD+24 3761, HD 183491, HIP 95785, HR 7406, SAO 87267[6]
Database references
SIMBADdata

8 Vulpeculae is star located about 457[1] light years away in the northern constellation of Vulpecula.[6] It lies just 7′ from Alpha Vulpeculae and the two form an optical double.[7] 8 Vulpeculae is visible to the naked eye as a faint, yellow-orange hued star with an apparent visual magnitude of 5.82. It is moving closer to the Earth with a heliocentric radial velocity of −29 km/s.[2]

This is an aging giant star with a stellar classification of K0 III,[3] which indicates it has exhausted the hydrogen supply at its core and evolved away from the main sequence. It is 324[5] million years old with three[4] times the mass of the Sun and has expanded to 14[1] times the Sun's radius. The star is radiating 100[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,915 K.[1]

  1. ^ a b c d e f g h i j k l Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Yoss1961 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Liu2014 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Simbad was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference WDS was invoked but never defined (see the help page).