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]

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]
Spectral type B2.5V[3]
U−B color index -0.72[2]
B−V color index -0.18[2]
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
Distance470 ± 20 ly
(143 ± 5 pc)
Absolute magnitude (MV)-0.91[5]
Mass7.2[6] M
Luminosity602[5] L
Temperature15,000[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

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]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ a b c Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. ^ Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications. 30: 57. Bibcode:1967IAUS...30...57E.
  5. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
  6. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873. Vizier catalog entry
  7. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352. Vizier catalog entry
  8. ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. S2CID 118345778. Vizier catalog entry
  9. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
  10. ^ Ian Ridpath's Star Tales - Sagittarius the Archer