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Class B2.5V star in the constellation Sagittarius From Wikipedia, the free encyclopedia
HD 172910 is a class B2.5V[3] (blue main-sequence) star in the constellation Sagittarius. Its apparent magnitude is 4.87[2] and it is approximately 467 light years away based on parallax.[1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 44m 19.35901s[1] |
Declination | −35° 38′ 31.1546″[1] |
Apparent magnitude (V) | 4.87[2] |
Characteristics | |
Spectral type | B2.5V[3] |
U−B color index | -0.72[2] |
B−V color index | -0.18[2] |
Astrometry | |
Radial velocity (Rv) | +3.90[4] km/s |
Proper motion (μ) | RA: -0.68[1] mas/yr Dec.: -27.24[1] mas/yr |
Parallax (π) | 6.99 ± 0.23 mas[1] |
Distance | 470 ± 20 ly (143 ± 5 pc) |
Absolute magnitude (MV) | -0.91[5] |
Details | |
Mass | 7.2[6] M☉ |
Luminosity | 602[5] L☉ |
Temperature | 15,000[7] K |
Metallicity [Fe/H] | +0.01[8] dex |
Rotational velocity (v sin i) | 65[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
It has one companion, B, with magnitude 12.6 and separation 10.0".[9]
In Chinese astronomy, HD 172910 is called 農丈人 (Pinyin: Nóngzhàngrén, lit. 'Peasant'), because this star is marking itself and stand alone in Peasant asterism, Dipper mansion (see : Chinese constellation).[10]
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