| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h44m 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 | |
CD-35°12876, CCDM J18443-3539A, FK5 3490, GC 25613, GSC 07419-03077, HIP 91918, HR 7029, HD 172910, SAO 210509, WDS J18443-3539A | |
| Database references | |
| SIMBAD | data |
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]
It has one companion, B, with magnitude 12.6 and separation 10.0".[9]
InChinese 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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