2 Vulpeculae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vulpecula |
| 2 Vul A | |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.43[3] |
| 2 Vul B | |
| Right ascension | Template:RA[4] |
| Declination | Template:DEC[4] |
| Characteristics | |
| Spectral type | B1 IV[5] |
| B−V Template:Engvar | Script error: No such module "val".[3] |
| Variable type | β Cep[6] |
| Astrometry | |
| 2 Vul A | |
| Radial velocity (Rv) | Script error: No such module "val".[3] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[2] mas/yr Dec.: Script error: No such module "val".[2] mas/yr |
| Parallax (π) | 1.8212±0.0880 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −2.35[3] |
| 2 Vul B | |
| Proper motion (μ) | RA: Script error: No such module "val".[4] mas/yr Dec.: Script error: No such module "val".[4] mas/yr |
| Parallax (π) | 1.7131±0.0757 mas[4] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Details | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Luminosity (bolometric) | 21,922[8] Template:Solar luminosity |
| Temperature | 26,850[8] K |
| Metallicity [Fe/H] | Script error: No such module "val".[9] dex |
| Rotational velocity (v sin i) | 270[10] km/s |
| Age | Script error: No such module "val".[7] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[11] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
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]
2 Vulpeculae is a double-lined spectroscopic binary;[12] as of 2002, the pair had an angular separation of Script error: No such module "val". 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]
References
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- ↑ a b Script error: No such module "Citation/CS1".
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- ↑ Template:Cite simbad
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
Script error: No such module "Check for unknown parameters".