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Epsilon Delphini
Star in the constellation Delphinus / From Wikipedia, the free encyclopedia
Epsilon Delphini (ε Delphini, abbreviated Eps Del, ε Del), officially named Aldulfin /ælˈdʌlfən/,[12] is a solitary,[13] blue-white hued star in the northern constellation of Delphinus. It is visible to the naked eye with an apparent visual magnitude of 4.03.[2] Based upon an annual parallax shift of 9.87 mas as seen from the Earth,[1] the system is located about 330 light-years from the Sun. At Epsilon Delphini's distance, the visual magnitude is diminished by an extinction factor of 0.11 due to interstellar dust.[6] The star is moving closer to the Sun with a radial velocity of −19 km/s.[5]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Delphinus |
Right ascension | 20h 33m 12.77192s[1] |
Declination | +11° 18′ 11.7412″[1] |
Apparent magnitude (V) | 4.03[2] (3.95−4.05)[3] |
Characteristics | |
Spectral type | B6 III[4] |
U−B color index | −0.46[2] |
B−V color index | −0.13[2] |
Variable type | suspected[3] |
Astrometry | |
Radial velocity (Rv) | −19.4±0.7[5] km/s |
Proper motion (μ) | RA: +11.96[1] mas/yr Dec.: −28.97[1] mas/yr |
Parallax (π) | 9.87 ± 0.21 mas[1] |
Distance | 330 ± 7 ly (101 ± 2 pc) |
Absolute magnitude (MV) | −0.06[6] |
Details | |
Radius | 4.6[7] R☉ |
Luminosity | 676[8] L☉ |
Surface gravity (log g) | 3.71±0.09[9] cgs |
Temperature | 13,614±15[7] K |
Metallicity [Fe/H] | +0.08±0.10[9] dex |
Rotational velocity (v sin i) | 52±4[10] km/s |
Age | 220[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is a B-type giant star with a stellar classification of B6 III.[4] It has 4.6[7] times the Sun's radius and is radiating 676[8] times the solar luminosity from its photosphere at an effective temperature of 13,614 K.[7] The star may be slightly variable, occasionally brightening to magnitude 3.95.[3] It is spinning with a projected rotational velocity of 52 km/s.[10]