Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Serpens |
Right ascension | 15h 28m 38.23670s [1] |
Declination | +01° 50′ 31.4852″ [1] |
Apparent magnitude (V) | 5.15 [2] |
Characteristics | |
Spectral type | A6 III [3] or A7 IV [4] |
B−V color index | 0.245±0.005 [2] |
Astrometry | |
Radial velocity (Rv) | −10.2±2.8 [2] km/s |
Proper motion (μ) |
RA: −85.35
[1]
mas/
yr Dec.: −34.31 [1] mas/ yr |
Parallax (π) | 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 [5] M☉ |
Luminosity | 11.9±0.4 [6] L☉ |
Surface gravity (log g) | 4.24±0.14 [5] cgs |
Temperature | 7,872±268 [5] K |
Rotational velocity (v sin i) | 110 [6] km/s |
Age | 424 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
10 Serpentis is a single, [8] 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 −10 km/s and will make its closest approach in around 983,000 years at a separation of about 112 ly (34.2 pc). [2]
Abt and Morrell (1995) gave this star a stellar classification of A6 III, [3] matching an evolved red giant star that has used up its core hydrogen. In contrast, Houk and Swift (1999) classed it A7 IV, [4] 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. [9] The star is about 424 million years old with 1.64 [5] times the mass of the Sun and is radiating 12 [6] times the Sun's luminosity from its photosphere at an effective temperature of roughly 7,872 K. [5]