Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 19h 52m 03.43853s [1] |
Declination | +11° 37′ 41.9725″ [1] |
Apparent magnitude (V) | 6.148 [2] |
Characteristics | |
Spectral type | G0 V [3] |
U−B color index | +0.12 [4] |
B−V color index | +0.65 [4] |
Variable type | suspected [5] |
Astrometry | |
Radial velocity (Rv) | −20.7±0.2 [2] km/s |
Proper motion (μ) |
RA: −344.185
[1]
mas/
yr Dec.: -334.608 [1] mas/ yr |
Parallax (π) | 37.0427 ± 0.0529 mas [1] |
Distance | 88.0 ± 0.1
ly (27.00 ± 0.04 pc) |
Absolute magnitude (MV) | 3.94 [2] |
Details [6] | |
Mass | 1.28±0.17 or 1.02 [7] M☉ |
Radius | 1.44±0.04 R☉ |
Luminosity | 2.09+0.10 −0.09 L☉ |
Surface gravity (log g) | 4.23 cgs |
Temperature | 5,774 K |
Metallicity [Fe/H] | −0.11 dex |
Rotational velocity (v sin i) | 0.1 km/s |
Age | 8.8±0.7 or 10.2 [7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 187923 is a suspected variable star [5] in the equatorial constellation of Aquila. It is a dim star that is just visible to the naked eye, having an apparent visual magnitude of 6.148. [2] Based upon an annual parallax shift of 37.04 mas, [1] it is located 88 light years away. The star is moving closer to the Earth with a heliocentric radial velocity of −20.7 km/s. [2] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.480 ″ per year. [9]
This is an ordinary G-type main-sequence star with a stellar classification of G0 V. [3] It has some similarities to the Sun, and thus is considered a solar analog. [10] Brewer et al. (2016) estimate the star has 1.3 times the mass of the Sun and 1.44 times the Sun's radius. It is thought to be around 9 billion years old and is spinning slowly with a projected rotational velocity of 0.1 km/s. The star is radiating double the Sun's luminosity from its photosphere at an effective temperature of 5,774 K. [6] Casagrande et al. (2011) gave a much lower mass estimate of 1.02 times the Sun's mass with an age of around 10.2 billion years. [7]