Astronomy:HD 115088

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Short description: Star in the constellation Chamaeleon
HD 115088
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Chamaeleon
Right ascension  13h 18m 48.27669s[1]
Declination −79° 58′ 33.6643″[1]
Apparent magnitude (V) 6.33±0.01[2]
Characteristics
Evolutionary stage main sequence[1]
Spectral type B9.5/A0 V[3]
U−B color index −0.21[4]
B−V color index −0.05[4]
Astrometry
Proper motion (μ) RA: −17.937[1] mas/yr
Dec.: −23.120[1] mas/yr
Parallax (π)7.9122 ± 0.0305[1] mas
Distance412 ± 2 ly
(126.4 ± 0.5 pc)
Absolute magnitude (MV)+0.51[5]
Details
Mass2.85±0.37[6] M☉
Radius2.33[7] R☉
Luminosity62.49[8] L☉
Surface gravity (log g)4.14[9] cgs
Temperature10,950±330[6] K
Age244+57−44[1] Myr
Other designations
CD−79°519, CPD−79°723, GC 17972, HD 115088, HIP 64951, SAO 257026[10]
Database references
SIMBADdata

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,[2] 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.[1] At that distance, its brightness is diminished by 0.37 magnitudes due to interstellar dust.[11]

HD 115088 has a stellar classification of B9.5/A0 V[3] — intermediate between a B9.5 and A0 main sequence star. It has 2.85 times the mass of the Sun[6] and double the radius of the Sun.[7] It radiates 62.5 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 10,950 K,[6] giving it a bluish-white hue. It is estimated to be 244 million years old, having completed 52.5% of its main sequence lifetime.[1]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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. ↑ 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. ↑ 3.0 3.1 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. ↑ 4.0 4.1 Pickles, A.; Depagne, É. (December 2010). "All-Sky Spectrally Matched UBVRI - ZY and u′g′r′i′z′ Magnitudes for Stars in the Tycho2 Catalog". Publications of the Astronomical Society of the Pacific 122 (898): 1437–1464. doi:10.1086/657947. ISSN 0004-6280. Bibcode: 2010PASP..122.1437P. 
  5. ↑ 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. 
  6. ↑ 6.0 6.1 6.2 6.3 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. 
  7. ↑ 7.0 7.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  8. ↑ 8.0 8.1 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. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..343M. 
  9. ↑ 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. 
  10. ↑ "HD 28454". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+28454. 
  11. ↑ 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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