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V3903 Sagittarii
Binary star system in the constellation Sagittarius / From Wikipedia, the free encyclopedia
V3903 Sagittarii (also known as 11 Sagittarii, or its abbreviation 11 Sgr) is an eclipsing binary star system in the constellation Sagittiarus. It creates an H II region LBN 29 (Sh 2-29) 1,070 parsecs (3,500 light-years) away from the Sun.[9]
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 09m 17.6999s[2] |
Declination | −23° 59′ 18.2312″ |
Apparent magnitude (V) | 7.00–7.45[3] |
Characteristics | |
Spectral type | O7V(n)z + B0:V:[4] |
U−B color index | −0.82[5] |
B−V color index | +0.16[5] |
Variable type | Algol[6] |
Astrometry | |
Proper motion (μ) | RA: +0.87±0.67[7] mas/yr Dec.: −0.66±0.42[7] mas/yr |
Parallax (π) | 0.8368 ± 0.0258 mas[8] |
Distance | 3,900 ± 100 ly (1,200 ± 40 pc) |
Absolute magnitude (MV) | −4.59 + −3.69[6] |
Orbit[6] | |
Period (P) | 1.744204 days |
Eccentricity (e) | 0 |
Inclination (i) | 65.20° |
Semi-amplitude (K1) (primary) | 236.6 km/s |
Semi-amplitude (K2) (secondary) | 339.4 km/s |
Details[6] | |
A | |
Mass | 27.27 M☉ |
Radius | 8.088 R☉ |
Luminosity | 122,000 L☉ |
Surface gravity (log g) | 4.058 cgs |
Temperature | 38,000 K |
Rotational velocity (v sin i) | 230 km/s |
B | |
Mass | 19.01 M☉ |
Radius | 6.125 R☉ |
Luminosity | 45,500 L☉ |
Surface gravity (log g) | 4.143 cgs |
Temperature | 34,100 K |
Rotational velocity (v sin i) | 170 km/s |
Age | 1.6 Myr |
Other designations | |
Database references | |
SIMBAD | data |
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John Flamsteed designated this star the Flamsteed designation 11 Sagittarii, although the designation 11 Sgr is now more often used to refer to the star he designated 1 Sagittarii.[10]