Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Microscopium |
Right ascension | 21h 12m 13.71281s [1] |
Declination | −40° 16′ 09.7010″ [1] |
Apparent magnitude (V) | 5.83 [2] (5.83 - 5.86) [3] |
Characteristics | |
Spectral type | F5 V [4] [5] |
B−V color index | +0.45 [2] |
Variable type | suspected [3] |
Astrometry | |
Radial velocity (Rv) | 4.5±0.9 [6] km/s |
Proper motion (μ) |
RA: +58.359
mas/
yr
[1] Dec.: −218.773 mas/ yr [1] |
Parallax (π) | 31.4586 ± 0.0401 mas [1] |
Distance | 103.7 ± 0.1
ly (31.79 ± 0.04 pc) |
Absolute magnitude (MV) | +3.33 [7] |
Details | |
Mass | 1.28 [8] M☉ |
Radius | 1.47+0.07 −0.04 [9] R☉ |
Luminosity | 3.79±0.01 [1] L☉ |
Surface gravity (log g) | 4.21±0.01 [10] cgs |
Temperature | 6,637±80 [11] K |
Metallicity [Fe/H] | +0.06±0.01 [12] dex |
Rotational velocity (v sin i) | 25.1±2.5 [13] km/s |
Age | 916 [8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 201647 (HR 8100; Gliese 9726; LTT 8410) is a solitary star [16] located in the southern constellation Microscopium. It is faintly visible to the naked eye as a yellowish-white-hued star with an apparent magnitude of 5.83. [2] The object is located relatively close at a distance of light-years based on Gaia DR3 parallax measurements, but it is receding with a heliocentric radial velocity of 4.5 km/s. [6] At its current distance, HD 201647's brightness is diminished by 0.11 magnitudes due to interstellar extinction [17] and it has an absolute magnitude of +3.33. [7] It has a relatively high proper motion across the celestial sphere, moving at a rate of 226.331 mas/yr. [18]
HD 201647 has a stellar classification of F5 V, [5] [4] indicating that it is an ordinary F-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 1.28 times the mass of the Sun [8] and 1.47 times the radius of the Sun. [9] It radiates 3.79 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 6,637 K. [11] HD 201647 is slightly metal enriched with an iron abundance of [Fe/H] = +0.06 or 115% of the Sun's. [12] It is estimated to be 916 million years old [8] and it spins modestly with a projected rotational velocity of 25.1 km/s. [13]
In the discovery paper for Lacaille 8760, HD 201647 was reported to be a variable star that varied between 5.83 and 5.86 in the visual passband. [3] As of 2004 however, it has not been confirmed to be variable. [19]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Microscopium |
Right ascension | 21h 12m 13.71281s [1] |
Declination | −40° 16′ 09.7010″ [1] |
Apparent magnitude (V) | 5.83 [2] (5.83 - 5.86) [3] |
Characteristics | |
Spectral type | F5 V [4] [5] |
B−V color index | +0.45 [2] |
Variable type | suspected [3] |
Astrometry | |
Radial velocity (Rv) | 4.5±0.9 [6] km/s |
Proper motion (μ) |
RA: +58.359
mas/
yr
[1] Dec.: −218.773 mas/ yr [1] |
Parallax (π) | 31.4586 ± 0.0401 mas [1] |
Distance | 103.7 ± 0.1
ly (31.79 ± 0.04 pc) |
Absolute magnitude (MV) | +3.33 [7] |
Details | |
Mass | 1.28 [8] M☉ |
Radius | 1.47+0.07 −0.04 [9] R☉ |
Luminosity | 3.79±0.01 [1] L☉ |
Surface gravity (log g) | 4.21±0.01 [10] cgs |
Temperature | 6,637±80 [11] K |
Metallicity [Fe/H] | +0.06±0.01 [12] dex |
Rotational velocity (v sin i) | 25.1±2.5 [13] km/s |
Age | 916 [8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 201647 (HR 8100; Gliese 9726; LTT 8410) is a solitary star [16] located in the southern constellation Microscopium. It is faintly visible to the naked eye as a yellowish-white-hued star with an apparent magnitude of 5.83. [2] The object is located relatively close at a distance of light-years based on Gaia DR3 parallax measurements, but it is receding with a heliocentric radial velocity of 4.5 km/s. [6] At its current distance, HD 201647's brightness is diminished by 0.11 magnitudes due to interstellar extinction [17] and it has an absolute magnitude of +3.33. [7] It has a relatively high proper motion across the celestial sphere, moving at a rate of 226.331 mas/yr. [18]
HD 201647 has a stellar classification of F5 V, [5] [4] indicating that it is an ordinary F-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 1.28 times the mass of the Sun [8] and 1.47 times the radius of the Sun. [9] It radiates 3.79 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 6,637 K. [11] HD 201647 is slightly metal enriched with an iron abundance of [Fe/H] = +0.06 or 115% of the Sun's. [12] It is estimated to be 916 million years old [8] and it spins modestly with a projected rotational velocity of 25.1 km/s. [13]
In the discovery paper for Lacaille 8760, HD 201647 was reported to be a variable star that varied between 5.83 and 5.86 in the visual passband. [3] As of 2004 however, it has not been confirmed to be variable. [19]