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Star in the constellation Vulpecula From Wikipedia, the free encyclopedia
2 Vulpeculae is a binary star[12] system in the northern constellation of Vulpecula, located around 1,800 light years away[2] from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.43.[3]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Vulpecula |
2 Vul A | |
Right ascension | 19h 17m 43.6354s[2] |
Declination | +23° 01′ 31.9418″[2] |
Apparent magnitude (V) | 5.43[3] |
2 Vul B | |
Right ascension | 19h 17m 43.7343s[4] |
Declination | +23° 01′ 30.8604″[4] |
Characteristics | |
Spectral type | B1 IV[5] |
B−V color index | 0.020±0.003[3] |
Variable type | β Cep[6] |
Astrometry | |
2 Vul A | |
Radial velocity (Rv) | +1.0±4.2[3] km/s |
Proper motion (μ) | RA: +0.956±0.041[2] mas/yr Dec.: −6.636±0.087[2] mas/yr |
Parallax (π) | 1.8212 ± 0.0880 mas[2] |
Distance | 1,790 ± 90 ly (550 ± 30 pc) |
Absolute magnitude (MV) | −2.35[3] |
2 Vul B | |
Proper motion (μ) | RA: −0.170±0.038[4] mas/yr Dec.: −5.324±0.073[4] mas/yr |
Parallax (π) | 1.7131 ± 0.0757 mas[4] |
Distance | 1,900 ± 80 ly (580 ± 30 pc) |
Details | |
Mass | 12.5±0.6[7] M☉ |
Luminosity (bolometric) | 21,922[8] L☉ |
Temperature | 26,850[8] K |
Metallicity [Fe/H] | −0.06±0.10[9] dex |
Rotational velocity (v sin i) | 270[10] km/s |
Age | 12.6±0.7[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
2 Vulpeculae is a double-lined spectroscopic binary;[12] as of 2002, the pair had an angular separation of 1.72″ along a position angle of 127.2°.[13]
The primary component of the binary is a rapidly rotating Be star[14] with a stellar classification of B1 IV.[5] It is a variable star with an amplitude of 0.06 magnitude and a period of 0.6096 days, tentatively classified as Beta Cephei variable.[6] The variability was discovered in 1959,[15] and it has been assigned the variable star designation ES Vulpeculae.[6]
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