Astronomy:HD 93963
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}} | |
|---|---|
| Constellation | Leo Minor[1] |
| A | |
| Right ascension | 10h 51m 06.5137s[2] |
| Declination | +25° 38′ 28.189″[2] |
| Apparent magnitude (V) | +9.18±0.02[3] |
| B | |
| Right ascension | 10h 51m 06.8665s[4] |
| Declination | +25° 38′ 24.800″[4] |
| Apparent magnitude (V) | {{{appmag_v2}}} |
| Characteristics | |
| A | |
| Evolutionary stage | main sequence[5] |
| Spectral type | G0V[6] |
| B | |
| Evolutionary stage | main sequence[6] |
| Spectral type | M5 V[6] |
| Apparent magnitude (G) | 16.9[4] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | +13.37±0.16[2] km/s |
| Proper motion (μ) | RA: −92.833[2] mas/yr Dec.: −22.911[2] mas/yr |
| Parallax (π) | 12.1506 ± 0.0171[2] mas |
| Distance | 268.4 ± 0.4 ly (82.3 ± 0.1 pc) |
| B | |
| Proper motion (μ) | RA: −90.705 mas/yr Dec.: −22.993 mas/yr |
| Parallax (π) | 11.9396 ± 0.1276[4] mas |
| Distance | 273 ± 3 ly (83.8 ± 0.9 pc) |
| Details[6] | |
| A | |
| Mass | 1.109±0.043 M☉ |
| Radius | 1.043±0.009 R☉ |
| Luminosity | 1.254±0.058 L☉ |
| Surface gravity (log g) | 4.49±0.11 cgs |
| Temperature | 5,987±64 K |
| Metallicity [Fe/H] | +0.10±0.04 dex |
| Rotation | 12.8±1.8 days |
| Rotational velocity (v sin i) | 5.9±0.8 km/s |
| Age | 1.4+0.8 −0.4 Gyr |
| B | |
| Mass | 0.162 M☉ |
| Radius | 0.196 R☉ |
| Temperature | 3,090 K |
| Other designations | |
| Database references | |
| SIMBAD | HD 93963 A |
| HD 93963 B | |
HD 93963 is a binary star in the constellation Leo Minor. At an apparent magnitude of +9.18, it is not visible to the naked eye. Parallax measurements give a distance of 268 light-years (82.3 parsecs) and 273 light-years (83.8 parsecs) for the primary and secondary component, respectively. Interstellar extinction causes the system's magnitude to be reduced by 0.10±0.05 magnitudes.[6]
Characteristics
The primary, HD 93963 A, is main sequence star[6] of class G0V.[6] The star has a mass 1.11 times that of the Sun and a radius 1.043 times solar. It irradiates 25% more luminosity than the Sun and has an effective temperature of 5,987 K,[6] giving it a yellowish-white hue as typical of G-type stars.[8]
The companion, HD 93963 B, is a red dwarf star of class M5V. The star has 0.16 times the mass and 0.20 times the radius of the Sun, with a cool effective temperature of 3,060 K. It has a projected separation of 484 au from the primary.[6]
Planetary system
Two planets have been discovered around the primary star in 2022 with the joint use of transit photometry and radial velocity.[6]
- HD 93963 A b is a super-Earth with an orbital period of 1.04 days. It orbits at a semi-major axis of 0.0209 AU and shows an inclination of 86.21 degrees. The planet has a radius of 1.35±0.042 Earth radii. Its mass estimate sits at 7.8±3.2 Earth masses.[6]
- HD 93963 A c is a sub-Neptune planet that completes an orbit every 3.65 days. Its radius measures 3.228±0.059 Earth radii and its mass measures 19.2±4.1 Earth masses.[6]
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 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" (in en). Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 4.0 4.1 4.2 4.3 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.
- ↑ MacDougall, Mason G.; Petigura, Erik A.; Gilbert, Gregory J.; Angelo, Isabel; Batalha, Natalie M.; Beard, Corey; Behmard, Aida; Blunt, Sarah et al. (2023-06-27). "The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars". The Astronomical Journal 166 (1): 33. doi:10.3847/1538-3881/acd557. ISSN 0004-6256.
- ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 Serrano, L. M.; Gandolfi, D.; Hoyer, S.; Brandeker, A.; Hooton, M. J.; Sousa, S.; Murgas, F.; Ciardi, D. R. et al. (2022-11-01). "The HD 93963 A transiting system: A 1.04 d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS" (in en). Astronomy & Astrophysics 667: A1. doi:10.1051/0004-6361/202243093. ISSN 0004-6361.
- ↑ "HD 93963". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+93963.
- ↑ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html. Retrieved 2012-01-16.
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