Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hercules |
Right ascension | 18h 08m 45.49142s [1] |
Declination | +20° 48′ 52.4079″ [1] |
Apparent magnitude (V) | 4.37 [2] |
Characteristics | |
Spectral type | B2 IV [3] [4] or B2 V [5] [6] |
B−V color index | −0.164±0.013 [2] |
Astrometry | |
Radial velocity (Rv) | −14.9±0.6 [2] km/s |
Proper motion (μ) |
RA: −1.92
[1]
mas/
yr Dec.: −5.89 [1] mas/ yr |
Parallax (π) | 3.56 ± 0.19 mas [1] |
Distance | 920 ± 50
ly (280 ± 10 pc) |
Absolute magnitude (MV) | −2.87 [2] |
Details | |
Mass | 9.7±0.2 [4] M☉ |
Luminosity | 3,631.92 [2] L☉ |
Surface gravity (log g) | 3.54 [7] cgs |
Temperature | 22,420±1,440 [8] K |
Rotational velocity (v sin i) | 41 [9] km/s |
Age | 20.0±1.4 [4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
102 Herculis is a single [11] star in the northern constellation of Hercules. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.37. [2] Based upon parallax measurements, it is located around 920 light years away from the Sun. [1] The star is moving closer to the Earth with a heliocentric radial velocity of −15 km/s. [2]
The stellar classification of this object matches a massive, early B-type star with a luminosity class of IV [3] or V, [5] corresponding to a subgiant or main sequence star, respectively. It is 20 [4] million years old with nearly ten [4] times the mass of the Sun and is spinning with a projected rotational velocity of 41 km/s. [9] The strength of the stellar magnetic field has been measured at (209.5±135.4)×10−4 T. [6] The star is radiating 3,632 [2] times the Sun's luminosity from its photosphere at an effective temperature of 22,420 K. [8]
In Chinese, 帛度 (Bó Dù), meaning Textile Ruler, refers to an asterism consisting of 102 Herculis and 95 Her [12].Consequently, 102 Herculis itself is known as 帛度二 (Bó Dù èr, English: the Second Star of Textile Ruler.)
This star, together with 93 Her, 95 Her, and 109 Her, formed the now obsolete constellation of Cerberus. [13]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hercules |
Right ascension | 18h 08m 45.49142s [1] |
Declination | +20° 48′ 52.4079″ [1] |
Apparent magnitude (V) | 4.37 [2] |
Characteristics | |
Spectral type | B2 IV [3] [4] or B2 V [5] [6] |
B−V color index | −0.164±0.013 [2] |
Astrometry | |
Radial velocity (Rv) | −14.9±0.6 [2] km/s |
Proper motion (μ) |
RA: −1.92
[1]
mas/
yr Dec.: −5.89 [1] mas/ yr |
Parallax (π) | 3.56 ± 0.19 mas [1] |
Distance | 920 ± 50
ly (280 ± 10 pc) |
Absolute magnitude (MV) | −2.87 [2] |
Details | |
Mass | 9.7±0.2 [4] M☉ |
Luminosity | 3,631.92 [2] L☉ |
Surface gravity (log g) | 3.54 [7] cgs |
Temperature | 22,420±1,440 [8] K |
Rotational velocity (v sin i) | 41 [9] km/s |
Age | 20.0±1.4 [4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
102 Herculis is a single [11] star in the northern constellation of Hercules. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.37. [2] Based upon parallax measurements, it is located around 920 light years away from the Sun. [1] The star is moving closer to the Earth with a heliocentric radial velocity of −15 km/s. [2]
The stellar classification of this object matches a massive, early B-type star with a luminosity class of IV [3] or V, [5] corresponding to a subgiant or main sequence star, respectively. It is 20 [4] million years old with nearly ten [4] times the mass of the Sun and is spinning with a projected rotational velocity of 41 km/s. [9] The strength of the stellar magnetic field has been measured at (209.5±135.4)×10−4 T. [6] The star is radiating 3,632 [2] times the Sun's luminosity from its photosphere at an effective temperature of 22,420 K. [8]
In Chinese, 帛度 (Bó Dù), meaning Textile Ruler, refers to an asterism consisting of 102 Herculis and 95 Her [12].Consequently, 102 Herculis itself is known as 帛度二 (Bó Dù èr, English: the Second Star of Textile Ruler.)
This star, together with 93 Her, 95 Her, and 109 Her, formed the now obsolete constellation of Cerberus. [13]