Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Delphinus |
Right ascension | 20h 55m 36.689s [1] |
Declination | +13° 43′ 17.531″ [1] |
Apparent magnitude (V) | 5.18 [2](5.16-5.27) [3] |
Characteristics | |
Spectral type | K0 III [4] |
U−B color index | +0.95 [5] |
B−V color index | +1.13 [5] |
Variable type | suspected [3] |
Astrometry | |
Radial velocity (Rv) | −10.2±0.9 [6] km/s |
Proper motion (μ) |
RA: +16.457
mas/
yr
[1] Dec.: −11.468 mas/ yr [1] |
Parallax (π) | 6.3132 ± 0.0699 mas [1] |
Distance | 517 ± 6
ly (158 ± 2 pc) |
Absolute magnitude (MV) | −0.64 [7] |
Details [8] | |
Mass | 2.33 M☉ |
Radius | 23.36 R☉ |
Luminosity | 219 L☉ |
Surface gravity (log g) | 2.07 cgs |
Temperature | 4,616 K |
Metallicity [Fe/H] | −0.19 [9] dex |
Rotational velocity (v sin i) | 3±1 [10] km/s |
Age | 832 Myr |
Other designations | |
Database references | |
SIMBAD | data |
17 Delphini is a solitary [11] star in the equatorial constellation Delphinus. It has an absolute magnitude of −0.64 [7] and apparent magnitude of 5.18, [2] allowing it to be faintly seen with the naked eye. Located 517 light years away, [1] it is approaching the Solar System with a heliocentric radial velocity of −10.2 km/s. [6]
17 Delphini is an orange giant that is most likely on the horizontal branch (84% probability). [8] At present it has 2.33 times the mass of the Sun, but at an age of 832 million years — has expanded to 23.36 times the radius of the Sun. [8] It shines at 219 solar luminosities from its enlarged photosphere at an effective temperature of 4,616 K, [8] giving it an orange glow. 17 Del has an iron abundance 64% that of the Sun [9] and spins modestly with a projected rotational velocity of 3 km/s. [10]
17 Del is suspected to be a variable star of unknown type ranging from 5.16 to 5.27. [3]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Delphinus |
Right ascension | 20h 55m 36.689s [1] |
Declination | +13° 43′ 17.531″ [1] |
Apparent magnitude (V) | 5.18 [2](5.16-5.27) [3] |
Characteristics | |
Spectral type | K0 III [4] |
U−B color index | +0.95 [5] |
B−V color index | +1.13 [5] |
Variable type | suspected [3] |
Astrometry | |
Radial velocity (Rv) | −10.2±0.9 [6] km/s |
Proper motion (μ) |
RA: +16.457
mas/
yr
[1] Dec.: −11.468 mas/ yr [1] |
Parallax (π) | 6.3132 ± 0.0699 mas [1] |
Distance | 517 ± 6
ly (158 ± 2 pc) |
Absolute magnitude (MV) | −0.64 [7] |
Details [8] | |
Mass | 2.33 M☉ |
Radius | 23.36 R☉ |
Luminosity | 219 L☉ |
Surface gravity (log g) | 2.07 cgs |
Temperature | 4,616 K |
Metallicity [Fe/H] | −0.19 [9] dex |
Rotational velocity (v sin i) | 3±1 [10] km/s |
Age | 832 Myr |
Other designations | |
Database references | |
SIMBAD | data |
17 Delphini is a solitary [11] star in the equatorial constellation Delphinus. It has an absolute magnitude of −0.64 [7] and apparent magnitude of 5.18, [2] allowing it to be faintly seen with the naked eye. Located 517 light years away, [1] it is approaching the Solar System with a heliocentric radial velocity of −10.2 km/s. [6]
17 Delphini is an orange giant that is most likely on the horizontal branch (84% probability). [8] At present it has 2.33 times the mass of the Sun, but at an age of 832 million years — has expanded to 23.36 times the radius of the Sun. [8] It shines at 219 solar luminosities from its enlarged photosphere at an effective temperature of 4,616 K, [8] giving it an orange glow. 17 Del has an iron abundance 64% that of the Sun [9] and spins modestly with a projected rotational velocity of 3 km/s. [10]
17 Del is suspected to be a variable star of unknown type ranging from 5.16 to 5.27. [3]