HD 171034
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Sagittarius[1] |
| Right ascension | 18h 33m 57.76631s[2] |
| Declination | −33° 00′ 59.6170″[2] |
| Apparent magnitude (V) | 5.28[1] |
| Characteristics | |
| Spectral type | B2III/IV[1] |
| B−V color index | −0.115[1] |
| Variable type | SPB?[3] |
| Astrometry | |
| Proper motion (μ) | RA: +1.691 mas/yr[2] Dec.: −11.670 mas/yr[2] |
| Parallax (π) | 2.7191±0.1688 mas[2] |
| Distance | 1,200 ± 70 ly (370 ± 20 pc) |
| Absolute magnitude (MV) | −2.73[1] |
| Details[4] | |
| Mass | 7.3±0.5 M☉ |
| Radius | 5.3±0.7 R☉ |
| Luminosity | 3200±700 L☉ |
| Surface gravity (log g) | 3.81±0.20 cgs |
| Temperature | 18800±900 K |
| Rotational velocity (v sin i) | 107±16 km/s |
| Other designations | |
| Alwasl, CD−33 13338, GC 25327, HD 171034, HIP 91014, HR 6960, SAO 210312, PPM 297883[5] | |
| Database references | |
| SIMBAD | data |
HD 171034, also named Alwasl, is a star in the constellation Sagittarius, about 1,200 light-years (370 parsecs) distant. With an apparent magnitude of 5.28, it is faintly visible to the naked eye under good viewing conditions. Its stellar classification is variously reported as B2III/IV[1] or B2IV/V,[6] indicating a B-type star of uncertain luminosity class. It is a possible Beta Cephei variable[4] or slowly pulsating B-type star.[3] A companion star at a separation of 0.25″ was first reported in 2010.[6]
In traditional Arab astronomy, al-Waṣl (الوَصْل), meaning the joint or connection, refers to the region between two asterisms in Sagittarius representing groups of ostriches – al-Naʿām al-Wārid "the incoming ostriches" and al-Naʿām al-Ṣādir "the outgoing ostriches". The IAU Working Group on Star Names adopted the name Alwasl for this star on 13 August 2026.[7]
References
[edit]- 1 2 3 4 5 6 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. XHIP record for this object at VizieR.
- 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 Balona, L. A.; Ozuyar, D. (April 2020). "Pulsation among TESS A and B stars and the Maia variables". Monthly Notices of the Royal Astronomical Society. 493 (4): 5871–5879. arXiv:2001.04497. Bibcode:2020MNRAS.493.5871B. doi:10.1093/mnras/staa670. ISSN 0035-8711. Catalog in VizieR
- 1 2 Hubrig, S.; Briquet, M.; et al. (April 2009). "New magnetic field measurements of β Cephei stars and slowly pulsating B stars". Astronomische Nachrichten. 330 (4): 317–329. arXiv:0902.1314. Bibcode:2009AN....330..317H. doi:10.1002/asna.200811187. ISSN 0004-6337.
- ↑ "HD 171034". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 September 2026.
- 1 2 Oudmaijer, René D.; Parr, Andrew M. (July 2010). "The binary fraction and mass ratio of Be and B stars: a comparative Very Large Telescope/NACO study". Monthly Notices of the Royal Astronomical Society. 405 (4): 2439–2446. arXiv:1003.0618. Bibcode:2010MNRAS.405.2439O. doi:10.1111/j.1365-2966.2010.16609.x.
- ↑ "IAU Catalog of Star Names". Retrieved 25 September 2026.
