Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Apus |
Right ascension | 17h 57m 41.686s [1] |
Declination | −76° 10′ 40.62″ [1] |
Apparent magnitude (V) | 6.07±0.01 [2] |
Characteristics | |
Evolutionary stage | red giant branch [3] |
Spectral type | K2 III [4] |
U−B color index | +1.28 [5] |
B−V color index | +1.20 [5] |
Astrometry | |
Radial velocity (Rv) | +36.8±0.4 [6] km/s |
Proper motion (μ) |
RA: +2.464
mas/
yr
[1] Dec.: −1.867 mas/ yr [1] |
Parallax (π) | 5.2546 ± 0.022 mas [1] |
Distance | 621 ± 3
ly (190.3 ± 0.8 pc) |
Absolute magnitude (MV) | −0.26 [7] |
Details | |
Mass | 3.05 [8] M☉ |
Radius | 20.8 [9] R☉ |
Luminosity | 185 [10] L☉ |
Surface gravity (log g) | 2.04±0.02 [3] cgs |
Temperature | 4,498 [10] K |
Metallicity [Fe/H] | −0.13 [11] dex |
Rotational velocity (v sin i) | 2.1±1.3 [12] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 161988, also known as HR 6635, is a solitary, orange hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.07, [2] allowing it to be faintly visible to the naked eye. Parallax measurements place it at a distance of 621 light years, [1] and it is currently receding with a heliocentric radial velocity of 36.8 km/s. [6]
The object has a stellar classification of K2 III, [4] indicating that it is a red giant. Gaia Data Release 3 models place it on the red giant branch. At present it has 3.05 times the mass of the Sun [8] and an enlarged radius of 20.8 R☉. [9] It shines at 185 times the luminosity of the Sun from its photosphere at an effective temperature of 4,498 K. [10] HD 161988 has an iron abundance 74% that of the Sun, [11] making it slightly metal deficient. Like most giants, it spins modestly with a projected rotational velocity of 2.1 km/s. [12]
HD 161988 has a 14th magnitude optical companion located 26.4 arcseconds away along a position angle of 122°. [15]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Apus |
Right ascension | 17h 57m 41.686s [1] |
Declination | −76° 10′ 40.62″ [1] |
Apparent magnitude (V) | 6.07±0.01 [2] |
Characteristics | |
Evolutionary stage | red giant branch [3] |
Spectral type | K2 III [4] |
U−B color index | +1.28 [5] |
B−V color index | +1.20 [5] |
Astrometry | |
Radial velocity (Rv) | +36.8±0.4 [6] km/s |
Proper motion (μ) |
RA: +2.464
mas/
yr
[1] Dec.: −1.867 mas/ yr [1] |
Parallax (π) | 5.2546 ± 0.022 mas [1] |
Distance | 621 ± 3
ly (190.3 ± 0.8 pc) |
Absolute magnitude (MV) | −0.26 [7] |
Details | |
Mass | 3.05 [8] M☉ |
Radius | 20.8 [9] R☉ |
Luminosity | 185 [10] L☉ |
Surface gravity (log g) | 2.04±0.02 [3] cgs |
Temperature | 4,498 [10] K |
Metallicity [Fe/H] | −0.13 [11] dex |
Rotational velocity (v sin i) | 2.1±1.3 [12] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 161988, also known as HR 6635, is a solitary, orange hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.07, [2] allowing it to be faintly visible to the naked eye. Parallax measurements place it at a distance of 621 light years, [1] and it is currently receding with a heliocentric radial velocity of 36.8 km/s. [6]
The object has a stellar classification of K2 III, [4] indicating that it is a red giant. Gaia Data Release 3 models place it on the red giant branch. At present it has 3.05 times the mass of the Sun [8] and an enlarged radius of 20.8 R☉. [9] It shines at 185 times the luminosity of the Sun from its photosphere at an effective temperature of 4,498 K. [10] HD 161988 has an iron abundance 74% that of the Sun, [11] making it slightly metal deficient. Like most giants, it spins modestly with a projected rotational velocity of 2.1 km/s. [12]
HD 161988 has a 14th magnitude optical companion located 26.4 arcseconds away along a position angle of 122°. [15]