10 Delphini
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 41m 16.2079s[1] |
| Declination | +14° 34′ 58.3606″[1] |
| Apparent magnitude (V) | 6.00±0.01[2] |
| Characteristics | |
| Evolutionary stage | red giant branch[1] |
| Spectral type | K4 III[3] |
| U−B color index | +1.44[4] |
| B−V color index | +1.24[5] |
| Astrometry | |
| Radial velocity (Rv) | −32±2[6] km/s |
| Proper motion (μ) | RA: −9.462 mas/yr[1] Dec.: −0.344 mas/yr[1] |
| Parallax (π) | 6.6178±0.0397 mas[1] |
| Distance | 493 ± 3 ly (151.1 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.06[7] |
| Details | |
| Mass | 2.42±0.71[8] M☉ |
| Radius | 18.47+1.02 −1.03[9] R☉ |
| Luminosity | 125±2[9] L☉ |
| Surface gravity (log g) | 2.27[10] cgs |
| Temperature | 4,378[10] K |
| Metallicity [Fe/H] | 0.00[10] dex |
| Age | 794±33[8] Myr |
| Other designations | |
| 10 Del, AG+14°2269, BD+14°4393, GC 28826, HD 197121, HIP 102080, HR 7918, SAO 106384 | |
| Database references | |
| SIMBAD | data |
10 Delphini (10 Del) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.00, allowing it to be faintly seen with the naked eye. Parallax measurements put the object at a distance of 493 light years but is drifting closer with a heliocentric radial velocity of −32 km/s.
10 Delphini has a stellar classification of K4 III[3] or K2 III,[11] both indicating that it is a red giant. However, there is some uncertainty behind the first classification. It has twice the mass of the Sun[8] but at an age of 794 million years[8] — expanded to 18 times the radius of the Sun.[9] It shines at 125 L☉[9] from its enlarged photosphere at an effective temperature of 4,378 K,[10] giving it an orange glow. 10 Del has a solar metallicity.[10]
10 Del has been suspected to be a variable star, although it hasn't been catalogued as such in the GCVS.[12]
References
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR2 record for this source at VizieR.
- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
