Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 57m 20.47670s [1] |
Declination | −20° 39′ 22.8539″ [1] |
Apparent magnitude (V) | +5.06 [2] |
Characteristics | |
Spectral type | B9/A0 Ib [3] |
U−B color index | −0.14 [2] |
B−V color index | +0.12 [2] |
Astrometry | |
Proper motion (μ) |
RA: −1.46
[1]
mas/
yr Dec.: −5.75 [1] mas/ yr |
Parallax (π) | 1.58 ± 0.26 mas [1] |
Distance | approx. 2,100
ly (approx. 600 pc) |
Absolute magnitude (MV) | −3.92 [4] |
Details | |
Mass | 7.8±0.1 [5] M☉ |
Radius | 15 [6] R☉ |
Luminosity | 2,753 [7] L☉ |
Surface gravity (log g) | 2.3 [8] cgs |
Temperature | 9,400 [8] K |
Metallicity [Fe/H] | −0.20 [8] dex |
Rotational velocity (v sin i) | 10 [9] km/s |
Age | 39.8±4.9 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Xi1 Sagittarii (ξ1 Sagittarii) is a solitary, [11] blue-white hued star in the zodiac constellation of Sagittarius. It is visible to the naked eye with an apparent visual magnitude of +5.06. [2] Based upon a small annual parallax shift of 1.58 mas as seen from Earth, [1] this system is located roughly 2,100 light years from the Sun.
This is a massive supergiant star [6] with a stellar classification of B9/A0 Ib. [3] With an estimated 7.8 [5] times the mass of the Sun and an age of about 40 [5] million years it has depleted the hydrogen at its core, causing it to expand to about 15 times the Sun's radius. [6] It is radiating 2,753 [7] times the Sun's luminosity from its photosphere at an effective temperature of about 9,400 K. [8]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 57m 20.47670s [1] |
Declination | −20° 39′ 22.8539″ [1] |
Apparent magnitude (V) | +5.06 [2] |
Characteristics | |
Spectral type | B9/A0 Ib [3] |
U−B color index | −0.14 [2] |
B−V color index | +0.12 [2] |
Astrometry | |
Proper motion (μ) |
RA: −1.46
[1]
mas/
yr Dec.: −5.75 [1] mas/ yr |
Parallax (π) | 1.58 ± 0.26 mas [1] |
Distance | approx. 2,100
ly (approx. 600 pc) |
Absolute magnitude (MV) | −3.92 [4] |
Details | |
Mass | 7.8±0.1 [5] M☉ |
Radius | 15 [6] R☉ |
Luminosity | 2,753 [7] L☉ |
Surface gravity (log g) | 2.3 [8] cgs |
Temperature | 9,400 [8] K |
Metallicity [Fe/H] | −0.20 [8] dex |
Rotational velocity (v sin i) | 10 [9] km/s |
Age | 39.8±4.9 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Xi1 Sagittarii (ξ1 Sagittarii) is a solitary, [11] blue-white hued star in the zodiac constellation of Sagittarius. It is visible to the naked eye with an apparent visual magnitude of +5.06. [2] Based upon a small annual parallax shift of 1.58 mas as seen from Earth, [1] this system is located roughly 2,100 light years from the Sun.
This is a massive supergiant star [6] with a stellar classification of B9/A0 Ib. [3] With an estimated 7.8 [5] times the mass of the Sun and an age of about 40 [5] million years it has depleted the hydrogen at its core, causing it to expand to about 15 times the Sun's radius. [6] It is radiating 2,753 [7] times the Sun's luminosity from its photosphere at an effective temperature of about 9,400 K. [8]