Astronomy:HD 128294
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Apus |
| Right ascension | 14h 41m 59.70978s[1] |
| Declination | −77° 00′ 41.2260″[1] |
| Apparent magnitude (V) | 6.34±0.01[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | B9 III[3] |
| B−V color index | −0.027±0.002[4] |
| Astrometry | |
| Radial velocity (Rv) | 8.94±2.29[1] km/s |
| Proper motion (μ) | RA: −21.428[1] mas/yr Dec.: −12.249[1] mas/yr |
| Parallax (π) | 5.2747 ± 0.0603[1] mas |
| Distance | 618 ± 7 ly (190 ± 2 pc) |
| Absolute magnitude (MV) | +0.07[4] |
| Details | |
| Mass | 2.66+0.47−0.25[5] M☉ |
| Radius | 3.62±0.11[5] R☉ |
| Luminosity | 145+20−31[1] L☉ |
| Surface gravity (log g) | 3.75+0.09−0.04[5] cgs |
| Temperature | 10,336+158−296[5] K |
| Metallicity [Fe/H] | −0.09[6] dex |
| Age | 286[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 128294 is a solitary, bluish-white hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.34,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 618 light-years.[1] At its current distance, HD 128294's brightness is heavily diminished by 0.43 magnitudes due to interstellar extinction[9] and it has an absolute magnitude of +0.07.[4]
HD 128294 has a stellar classification of B9 III,[3] indicating that it is an evolved blue giant. At the age of 286 million years,[7] the object has completed 71.9% of its main sequence lifetime according to Gaia DR3 models.[1] It has 2.66 times the mass of the Sun and a slightly enlarged radius 3.62 times that of the Sun's.[5] It radiates 145 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 10,336 K.[5] According to astrophysical parameters based on the Gaia passband, HD 128294 has an iron abundance 81.3% that of the Sun's ([Fe/H) = −0.09),[6] making it slightly metal deficient.
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 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 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. 1. Bibcode: 1975mcts.book.....H.
- ↑ 4.0 4.1 4.2 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.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 6.0 6.1 Anders, F. et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A.
- ↑ 7.0 7.1 Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters 38 (11): 694–706. doi:10.1134/S1063773712110035. ISSN 1063-7737. Bibcode: 2012AstL...38..694G.
- ↑ "HD 128294". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+128294.
- ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G.
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