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HD 128294

Blue giant in the constellation Apus

HD 128294
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Apus
Right ascension	14^h 41^m 59.70978^s^[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 (R_v)	8.94±2.29^[1] km/s
Proper motion (μ)	RA: −21.428 mas/yr^[1] Dec.: −12.249 mas/yr^[1]
Parallax (π)	5.2747±0.0603 mas^[1]
Distance	618 ± 7 ly (190 ± 2 pc)
Absolute magnitude (M_V)	+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
12 G. Apodis^[8], CD−76°655, CPD−76°848, GC 19736, HD 128294, HIP 71870, SAO 257182^[9]
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^[10] 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 2 3 4 5 6 7 8 9 10 11 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 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode:1975mcts.book.....H.
1 2 3 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
1 2 3 4 5 6 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
1 2 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. arXiv:2111.01860. Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369. eISSN 1432-0746. ISSN 0004-6361.
1 2 Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters. 38 (11): 694–706. arXiv:1606.09028. Bibcode:2012AstL...38..694G. doi:10.1134/S1063773712110035. eISSN 1562-6873. ISSN 1063-7737. S2CID 255202762.
↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
↑ "HD 128294". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 20, 2015.
↑ 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. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.

v
t
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Constellation of Apus

Apus in Chinese astronomy
List of stars in Apus

Stars

Bayer	α (Paradys) β γ δ ε ζ η θ ι κ¹ κ²
Variable	R (not variable) S Z MY NN NO
HR	5240 5279 5306 5327 5389 5520 5547 5555 5628 5757 5786 5955 6135 6357 6373 6635 6646 6731 6751
HD	128294 129899 131664 134606 137366 137388 (Karaka) 141846 152010
Other	Godzilla

Star
clusters

NGC	6101
Other	IC 4499

Nebulae	Hen 2-131

Galaxies

NGC	6209
Other	PKS 1610−771 Sunburst Galaxy