HD 121439

Last updated
HD 121439
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Apus
Right ascension 14h 00m 32.81143s [1]
Declination −78° 35′ 23.9308″ [1]
Apparent magnitude  (V)6.08±0.01 [2]
Characteristics
Spectral type B9 III [3]
U−B color index −0.17 [4]
B−V color index +0.03 [4]
Astrometry
Radial velocity (Rv)4±4.7 [5]  km/s
Proper motion (μ)RA: −14.337  mas/yr [1]
Dec.: −9.094  mas/yr [1]
Parallax (π)4.2166 ± 0.0425  mas [1]
Distance 774 ± 8  ly
(237 ± 2  pc)
Absolute magnitude  (MV)−0.80 [6]
Details
Mass 3.26 [7]   M☉
Radius 5.55 [8]   R☉
Luminosity 168 [9]   L☉
Surface gravity (log g)3.48 [7]   cgs
Temperature 9,708±124 [10]   K
Metallicity [Fe/H]+0.22 [7]   dex
Other designations
3 G. Apodis [11] , CD−77°626, CPD−77°922, FK5  3111, GC  18877, HD  121439, HIP  68431, HR  5240, SAO  257107 [12]
Database references
SIMBAD data

HD 121439, also known as HR 5240, is a solitary, bluish-white hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.08, [2] allowing it to be faintly visible to the naked eye. The object is located relatively far at a distance of 774 light years [1] based on Gaia DR3 parallax measurements but is receding with a fairly constrained radial velocity of 4  km/s . [5] At its current distance, HD 121439's brightness is diminished by 0.57 magnitudes due to interstellar dust. [13]

This is an evolved giant star with a stellar classification of B9 III. [3] It has 3.26 times the mass of the Sun [7] but has expanded to 5.6 times its girth. [8] It radiates 168 times the luminosity of the Sun [9] from its photosphere at an effective temperature of 9,708  K . [10] Based on extinction from the Gaia passband, HD 121439 has an iron abundance 1.65 times that of the Sun. [7] This makes the object metal enriched.

Related Research Articles

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<span class="mw-page-title-main">Theta Coronae Australis</span> Star in the constellation Corona Australis

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HD 128294 is a solitary, bluish-white hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.34, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 618 light-years. At its current distance, HD 128294's brightness is heavily diminished by 0.43 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.07.

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<span class="mw-page-title-main">HD 76236</span> Star in the constellation Chamaeleon

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HD 194612 is a solitary orange hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.9, making it visible to the naked eye under ideal conditions. Parallax measurements place it at a distance of 760 light years and it has a low heliocentric radial velocity of 0.3 km/s.

HD 31529, also known as HR 1584, is a solitary, orange hued star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 6.09, making it faintly visible to the naked eye if viewed under ideal conditions. This object is located relatively far at a distance of 932 light years based on parallax measurements from Gaia DR3, but is receding with a heliocentric radial velocity of 28.4 km/s. Eggen (1989) lists it as a member of the old disk population.

HD 115088, also known as HIP 64951, is a star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.33, placing it near the limit for naked eye visibility. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 412 light years distant. At that distance, its brightness is diminished by 0.37 magnitudes due to interstellar dust.

HD 43899, also designated as HR 2263, is a solitary, orange hued star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.53, allowing it to be faintly visible to the naked eye. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 284 light years distant. It appears to be rapidly receding with a heliocentric radial velocity of 66.5 km/s. Eggen (1993) lists HD 43899 as an old disk star and its kinematics match with that of the ζ Herculis moving group.

<span class="mw-page-title-main">HD 40091</span> Star in the constellation Columba

HD 40091, also known as HR 2082, is a solitary star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.54, making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 501 light years distant. However, it is rapidly receding with a high heliocentric radial velocity of 114 km/s.

<span class="mw-page-title-main">HD 198716</span> Star in the constellation of Microscopium

HD 198716, also known as HR 7987 or 33 G. Microscopii, is a solitary star located in the southern constellation Microscopium. Eggen (1993) lists it as a member of the Milky Way's old disk population.

HD 59640 is a solitary white hued star located in the southern circumpolar constellation Volans. It has an apparent magnitude of 6.48, placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place the object at a distance of 262 light years and it is receding with a heliocentric radial velocity of 18.4 km/s. At its current distance, HD 59640's brightness is diminished by three tenths of a magnitude due to interstellar dust.

<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

HD 168592, also designated as HR 6862 or rarely 7 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.07. Gaia DR3 parallax measurements place it at a distance of 490 light years and is currently receding with a heliocentric radial velocity of 18 km/s. At its current distance, HD 168592's brightness is diminished by 0.38 magnitudes due to interstellar dust. It has an absolute magnitude of −0.76.

<span class="mw-page-title-main">HD 176425</span> A-type dwarf; Corona Australis

HD 176425, also known as HR 7177 or rarely 38 G. Coronae Australis, is a solitary, bluish-white hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 6.21, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 358 light-years, and it is currently drifting closer with a heliocentric radial velocity of −12.8 km/s. At its current distance, HD 176425's brightness is diminished by an interstellar extinction factor of 0.27 magnitudes and it has an absolute magnitude of +0.75.

HD 177365 is a visual binary located in the southern constellation Telescopium. It has an apparent magnitude of 6.27, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 373 light-years and it is currently receding with a heliocentric radial velocity of 15.5 km/s. At its current distance, HD 177365's brightness is diminished by two-tenths of a magnitude due to interstellar extinction and it has an absolute magnitude of +0.16.

<span class="mw-page-title-main">HD 177693</span> K-type giant in the constellation Telescopium

HD 177693 is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.45, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 376 light-years, and it is drifting closer with a heliocentric radial velocity of −20.9 km/s. At its current distance, HD 177693's brightness is diminished by 0.24 magnitudes due to interstellar extinction and it has an absolute magnitude of +1.03.

<span class="mw-page-title-main">HD 169904</span> B-type main-sequence star; Octans

HD 169904 is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.26, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 482 light-years and it is currently drifting closer with a somewhat constrained radial velocity of −6.0 km/s. At its current distance, HD 169904's brightness is diminished by 0.24 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.19.

References

  1. 1 2 3 4 5 6 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.
  2. 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.
  3. 1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode:1975mcts.book.....H.
  4. 1 2 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  6. ↑ 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.
  7. 1 2 3 4 5 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.
  8. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  9. 1 2 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". 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 . eISSN   1365-2966. ISSN   0035-8711.
  10. 1 2 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.
  11. ↑ 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.
  12. ↑ "HD 121439". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 6, 2022.
  13. ↑ 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.
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