13 Delphini
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Delphinus |
| A | |
| Right ascension | 20h 47m 48.3330s |
| Declination | +06° 00′ 29.551″ |
| Apparent magnitude (V) | 5.66 |
| B | |
| Right ascension | 20h 47m 48.3012s |
| Declination | +06° 00′ 28.127″ |
| Apparent magnitude (V) | 8.51 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A0 V |
| U−B color index | −0.09 |
| B−V color index | −0.01 |
| Astrometry | |
| Radial velocity (Rv) | −7±4.3 km/s |
| Absolute magnitude (MV) | −0.01 |
| A | |
| Proper motion (μ) | RA: +8.255 mas/yr Dec.: −13.162 mas/yr |
| Parallax (π) | 6.9265±0.0489 mas |
| Distance | 471 ± 3 ly (144 ± 1 pc) |
| B | |
| Proper motion (μ) | RA: +5.663 mas/yr Dec.: −12.280 mas/yr |
| Parallax (π) | 6.6697 ± 0.0989 mas |
| Distance | 489 ± 7 ly (150 ± 2 pc) |
| Details | |
| Mass | 2.51+0.31 −0.36 M☉ |
| Radius | 3.7±0.4 R☉ |
| Luminosity | 119+20 −17 L☉ |
| Surface gravity (log g) | 3.69+0.61 −0.69 cgs |
| Temperature | 9,840+91 −90 K |
| Metallicity [Fe/H] | 0.00 dex |
| Rotational velocity (v sin i) | 170 km/s |
| Age | 307 Myr |
| Other designations | |
| 13 Del, 18 G. Delphini, AG+05°3035, BD+05°4613, GC 28986, HD 198069, HIP 102633, HR 7953, SAO 126222, WDS J20478+0600A | |
| Database references | |
| SIMBAD | data |
13 Delphini is a binary star in the equatorial constellation Delphinus, with a combined apparent magnitude of 5.64. The system is located at a distance of 471 light years but is approaching the Solar System with a heliocentric radial velocity of about −7 km/s.
13 Delphini A has an apparent magnitude of 5.66, while its companion has an apparent magnitude of 8.51. As of 2016, the pair have a separation of 1.5″ located at a position angle of 200°.
13 Delphini has a blended stellar classification of A0 V, indicating that it is an ordinary A-type main-sequence star. However, when the components are analysed individually, the primary star is given a class of B9V. It has 2.51 times the mass of the Sun and has an effective temperature of 9,840 K. However, the star is large for its class, having a radius almost 4 times that of the Sun and a luminosity 119 times greater. This is due to 13 Delphini having completed 86.1% of its main sequence lifetime and has led one source to classify it as a subgiant instead. It spins rapidly with a projected rotational velocity of 170 km/s and has an age of 307 million years.