HD 118508
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13h 36m 59.08233s[1] |
| Declination | +24° 36′ 47.8687″[1] |
| Apparent magnitude (V) | 5.8[2] |
| Characteristics | |
| Evolutionary stage | red giant |
| Spectral type | M2III[3] |
| U−B color index | +1.85[4] |
| B−V color index | +1.58[4] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | −35.69±0.18[2] km/s |
| Proper motion (μ) | RA: −26.654[1] mas/yr Dec.: −2.803[1] mas/yr |
| Parallax (π) | 5.9122 ± 0.0860 mas[1] |
| Distance | 552 ± 8 ly (169 ± 2 pc) |
| Absolute magnitude (MV) | −0.431[6] |
| Details | |
| Mass | 1.1[7] M☉ |
| Radius | 49[8] R☉ |
| Luminosity | 324[9] L☉ |
| Surface gravity (log g) | 1.04[7] cgs |
| Temperature | 3,594[7] K |
| Metallicity [Fe/H] | +0.44[7] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 118508 is a suspected variable star in the northern constellation of Boötes. Its apparent magnitude may vary with an amplitude of 0.04, discovered during a search for small-amplitude red variables.[5] It is a red giant about 552 light years away.
References
[edit]- ^ a b c d e 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.
- ^ a b Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976
- ^ a b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
- ^ a b Percy, John R.; Au, Winnie (November 1994), "APT Observations of Small-Amplitude Red Variables", Information Bulletin on Variable Stars, 4114 (4114): 1, Bibcode:1994IBVS.4114....1P
- ^ Gontcharov, G. A. (2017), "VizieR Online Data Catalog: Tycho-2 red giant branch and carbon stars (Gontcharov, 2011)", VizieR On-line Data Catalog, Bibcode:2017yCat..90370769G
- ^ a b c d Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18", Astronomy and Astrophysics, 628: A94, arXiv:1904.11302, Bibcode:2019A&A...628A..94A, doi:10.1051/0004-6361/201935765, S2CID 131780028
- ^ Stassun K.G.; et al. (October 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, S2CID 166227927
- ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352
External links
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