Astronomy:KIC 11145123
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 41m 25.34114s[1] |
| Declination | +48° 45′ 14.9900″[1] |
| Apparent magnitude (V) | 13.12[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | F7V[3] |
| B−V color index | +0.33[2] |
| Variable type | δ Scuti[4] |
| Astrometry | |
| Radial velocity (Rv) | −136±4[5] km/s |
| Proper motion (μ) | RA: −20.900[1] mas/yr Dec.: −3.693[1] mas/yr |
| Parallax (π) | 0.8344 ± 0.01[1] mas |
| Distance | 3,910 ± 50 ly (1,200 ± 10 pc) |
| Details | |
| Mass | 1.46[6] M☉ |
| Radius | 1.57±0.07[7] R☉ |
| Luminosity | 12.6[8] L☉ |
| Surface gravity (log g) | 4.22[8] cgs |
| Temperature | 7,590[8] K |
| Metallicity [Fe/H] | −0.1±0.11[8] dex |
| Rotation | ≈100 days[8] |
| Rotational velocity (v sin i) | 1[8] km/s |
| Age | 756[1] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
KIC 11145123 (sometimes mistakenly called Kepler 1145123[9]), is a white hued star located in the northern constellation Cygnus, the swan. It has an apparent magnitude of 13.12,[2] making it readily visible in large telescopes, but not to the naked eye. The object is located relatively far at a distance of approximately 3,910 light years,[1] but is rapidly approaching the Solar System with a radial velocity of −136 km/s.[5]
Characteristics
KIC 11145123 has a spectral classification of F7V,[3] indicating that it is a main sequence F-type star. Atmospheric models suggest it may be hotter and possibly a late A-type star.[4] It has 1.4 times the mass of the Sun, in contrast to the 1.7 times that would be expected from a normal late A main sequence star, and 1.57 times its radius.[7] It radiates 12 times the luminosity of the Sun from its photosphere at an effective temperature of 7,590 K.[8] Unlike most hot stars, KIC 11145123 spins exceptionally slowly with a projected rotational velocity of 1 km/s.[8] This corresponds to a period of roughly 100 days.[8] Despite appearing as a main sequence star (Gaia DR3 models it as such),[1] it is most likely a blue straggler.[10][6]
Roundest natural object
KIC 11145123 is believed to currently be the roundest natural object, with the difference between equatorial and polar radii equaling a mere three kilometers.[9]
References
- ↑ 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.
- ↑ 2.0 2.1 2.2 Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". VizieR On-line Data Catalog: I/322A. Originally Published in: 2012yCat.1322....0Z; 2013AJ....145...44Z 1322. Bibcode: 2012yCat.1322....0Z.
- ↑ 3.0 3.1 Frasca, A.; Molenda-Żakowicz, J.; De Cat, P.; Catanzaro, G.; Fu, J. N.; Ren, A. B.; Luo, A. L.; Shi, J. R. et al. (2016). "Activity indicators and stellar parameters of the Kepler targets. An application of the ROTFIT pipeline to LAMOST-Kepler stellar spectra". Astronomy and Astrophysics 594. doi:10.1051/0004-6361/201628337. Bibcode: 2016A&A...594A..39F.
- ↑ 4.0 4.1 Kurtz, Donald W.; Saio, Hideyuki; Takata, Masao; Shibahashi, Hiromoto; Murphy, Simon J.; Sekii, Takashi (13 August 2014). "Asteroseismic measurement of surface-to-core rotation in a main-sequence A star, KIC 11145123". Monthly Notices of the Royal Astronomical Society 444 (1): 102–116. doi:10.1093/mnras/stu1329. ISSN 0035-8711. Bibcode: 2014MNRAS.444..102K.
- ↑ 5.0 5.1 Tsantaki, M.; Pancino, E.; Marrese, P.; Marinoni, S.; Rainer, M.; Sanna, N.; Turchi, A.; Randich, S. et al. (March 2022). "Survey of Surveys". Astronomy & Astrophysics 659: A95. doi:10.1051/0004-6361/202141702. ISSN 0004-6361. Bibcode: 2022A&A...659A..95T.
- ↑ 6.0 6.1 Hatta, Yoshiki; Sekii, Takashi; Takata, Masao; Benomar, Othman (2021). "Nonstandard Modeling of a Possible Blue Straggler Star, KIC 11145123". The Astrophysical Journal 923 (2): 244. doi:10.3847/1538-4357/ac23c9. Bibcode: 2021ApJ...923..244H.
- ↑ 7.0 7.1 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.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 Takada-Hidai, Masahide; Kurtz, Donald W.; Shibahashi, Hiromoto; Murphy, Simon J.; Takata, Masao; Saio, Hideyuki; Sekii, Takashi (2017). "Spectroscopic and asteroseismic analysis of the remarkable main-sequence a star KIC 11145123". Monthly Notices of the Royal Astronomical Society 470 (4): 4908. doi:10.1093/mnras/stx1506. Bibcode: 2017MNRAS.470.4908T.
- ↑ 9.0 9.1 "Kepler 11145123 is Most Spherical Natural Object Ever Seen, Astronomers Say | Astronomy | Sci-News.com" (in en-US). 18 November 2016. http://www.sci-news.com/astronomy/kepler-11145123-most-spherical-natural-object-04378.html.
- ↑ Hatta, Yoshiki; Sekii, Takashi; Takata, Masao; Kurtz, Donald W. (2019). "The Two-dimensional Internal Rotation of KIC 11145123". The Astrophysical Journal 871 (2): 135. doi:10.3847/1538-4357/aaf881. Bibcode: 2019ApJ...871..135H.
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