Astronomy:HD 156768
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Short description: Double star in the constellation Ara
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}} | |
|---|---|
| Constellation | Ara |
| A | |
| Right ascension | 17h 22m 55.22140s[1] |
| Declination | −58° 00′ 37.1789″[1] |
| Apparent magnitude (V) | 6.1[2] |
| B | |
| Right ascension | 17h 22m 55.20446s[3] |
| Declination | −58° 00′ 38.9718″[3] |
| Apparent magnitude (V) | 9.6[2] |
| Characteristics | |
| A | |
| Spectral type | G8Ib/II[4] |
| U−B color index | +0.86[5] |
| B−V color index | +1.07[5] |
| B | |
| B−V color index | +0.39[6] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −9.42±0.13[1] km/s |
| Proper motion (μ) | RA: −5.959[1] mas/yr Dec.: −15.651[1] mas/yr |
| Parallax (π) | 3.1386 ± 0.0412[1] mas |
| Distance | 1,040 ± 10 ly (319 ± 4 pc) |
| Absolute magnitude (MV) | −1.69[7] |
| B | |
| Radial velocity (Rv) | −9.80±0.20[8] km/s |
| Proper motion (μ) | RA: −6.006[3] mas/yr Dec.: −14.316[3] mas/yr |
| Parallax (π) | 2.9305 ± 0.0404[3] mas |
| Distance | 1,110 ± 20 ly (341 ± 5 pc) |
| Details | |
| HD 156768 A | |
| Mass | 4.5[1] M☉ |
| Radius | 37[1] R☉ |
| Luminosity | 527[1] L☉ |
| Surface gravity (log g) | 1.76[1] cgs |
| Temperature | 4,580[1] K |
| Rotational velocity (v sin i) | 2.6±1.0[9] km/s |
| HD 156768 B | |
| Mass | 1.6[10] M☉ |
| Surface gravity (log g) | 3.79[10] cgs |
| Temperature | 6,592[10] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 156768 is a double star in the southern constellation of Ara, with a combined apparent magnitude of 5.86.[11] The brighter component is a sixth magnitude bright giant or supergiant star with a stellar classification of G8Ib/II.[4] The magnitude 9.6 companion lies at an angular separation of 1.81″ along a position angle of 184°.[2]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics 356: 141–145, Bibcode: 2000A&A...356..141F.
- ↑ 3.0 3.1 3.2 3.3 3.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 4.0 4.1 Houk, Nancy; Cowley, A. P. (1979), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor: Dept. Of Astronomy (Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan) 1, Bibcode: 1978mcts.book.....H.
- ↑ 5.0 5.1 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode: 1978A&AS...34....1N
- ↑ Fabricius, C. et al. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics 384: 180–189. doi:10.1051/0004-6361:20011822. Bibcode: 2002A&A...384..180F.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ Kharchenko, N. V.; Scholz, R.-D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889. doi:10.1002/asna.200710776. Bibcode: 2007AN....328..889K.
- ↑ De Medeiros, J. R. et al. (November 2002), "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars", Astronomy and Astrophysics 395: 97–98, doi:10.1051/0004-6361:20021214, Bibcode: 2002A&A...395...97D
- ↑ 10.0 10.1 10.2 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O. et al. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode: 2022yCat.1354....0A.
- ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
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