10 Serpentis
Star in the constellation Serpens
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10 Serpentis is a single,[9] white-hued star in Serpens Caput, the western section of the equatorial constellation of Serpens. It is faintly visible to the naked eye with an apparent visual magnitude of 5.15.[2] Located around 129 ly (39.7 pc) distant, it is moving closer to the Sun with a heliocentric radial velocity of â10 km/s and will make its closest approach in around 983,000 years at a separation of about 112 ly (34.2 pc).[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 28m 38.23670s[1] |
| Declination | +01° 50â² 31.4852â³[1] |
| Apparent magnitude (V) | 5.15[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3][4] |
| Spectral type | A6 III[5] or A7 IV[6] |
| BâV color index | 0.245±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | â10.2±2.8[2] km/s |
| Proper motion (μ) | RA: â85.35[1] mas/yr Dec.: â34.31[1] mas/yr |
| Parallax (Ï) | 25.16±0.31 mas[1] |
| Distance | 130 ± 2 ly (39.7 ± 0.5 pc) |
| Absolute magnitude (MV) | 2.15[2] |
| Details | |
| Mass | 1.64[7] Mâ |
| Radius | 1.87[4] Râ |
| Luminosity | 11.9±0.4[3] Lâ |
| Surface gravity (log g) | 4.24±0.14[7] cgs |
| Temperature | 7,550[4] K |
| Rotational velocity (v sin i) | 110[3] km/s |
| Age | 424[7] Myr |
| Other designations | |
| 10 Ser, BD+02°2965, FK5 3221, HD 137898, HIP 75761, HR 5746, SAO 121020[8] | |
| Database references | |
| SIMBAD | data |
Abt and Morrell (1995) gave this star a stellar classification of A6 III,[5] matching an evolved red giant star that has used up its core hydrogen. In contrast, Houk and Swift (1999) classed it A7 IV,[6] which is more in line with an evolving subgiant star that is on its way to becoming a giant. It has a high rate of spin with a projected rotational velocity of 115 km/s, giving it an oblate shape with an equatorial bulge that is an estimated 7% larger than the polar radius.[10] The star is about 424 million years old with 1.64 times the mass of the Sun[7] and is radiating 12 times the Sun's luminosity[3] from its photosphere at an effective temperature of roughly 7,872 K.[7]