HD 172910

Last updated
HD 172910
Sagittarius constellation map.svg
Red circle.svg
Location of HD 172910 (circled)
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 [1]   mas
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]

In Chinese astronomy, HD 172910 is called 農丈人, Pinyin: Nóngzhàngrén, meaning Peasant, because this star is marking itself and stand alone in Peasant asterism, Dipper mansion (see : Chinese constellation). [10]

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References

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  10. Ian Ridpath's Star Tales - Sagittarius the Archer