HD 88133 is a yellow star with an orbiting exoplanet in the equatorial constellation of Leo. It has an apparent visual magnitude of 8.01,[2] which is too faint to be visible to the naked eye. With a small telescope it should be easily visible. The distance to this system, as measured through parallax, is 240 light years, but it is slowly drifting closer with a radial velocity of −3.6 km/s.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | 10h 10m 07.676s[1] |
| Declination | +18° 11′ 12.73″[1] |
| Apparent magnitude (V) | 8.01[2] |
| Characteristics | |
| Spectral type | G8V[3] |
| B−V color index | 0.810±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.62±0.14[4] km/s |
| Proper motion (μ) | RA: −11.135 mas/yr[1] Dec.: −264.912 mas/yr[1] |
| Parallax (π) | 13.5882 ± 0.0249 mas[1] |
| Distance | 240.0 ± 0.4 ly (73.6 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.50[5] |
| Details | |
| Mass | 1.23±0.16[6] M☉ |
| Radius | 2.01±0.04[6] R☉ |
| Luminosity | 3.14±0.02[4] L☉ |
| Surface gravity (log g) | 3.82[5] cgs |
| Temperature | 5,414±97[4] K |
| Metallicity [Fe/H] | 0.26[5] dex |
| Rotational velocity (v sin i) | 4.9[5] km/s |
| Age | 5.08[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is classified as an ordinary G-type main-sequence star with a stellar classification of G8V.[3] However, D. A. Fischer and associates in 2005 listed a class of G5 IV, suggesting it is instead a subgiant star that is evolving away from the main sequence having exhausted the hydrogen at its core.[8] It is about 5 billion years old and is spinning with a projected rotational velocity of 4.9 km/s.[5] The star has 23% more mass than the Sun and has double the Sun's girth.[6] It is radiating over three times the luminosity of the Sun from its photosphere at an effective temperature of 5,414 km/s.[4]
Planetary system
editIn 2004 a close orbiting exoplanet was found using Doppler spectroscopy.[8] In 2016 the direct detection of the planetary thermal emission spectrum was claimed,[9] but the detection was brought into questioned in 2021.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥0.282±0.046 MJ | 0.0479±0.0032 | 3.414887±0.000045 | 0 (fixed) | — | — |
See also
editReferences
edit- ^ a b c d 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 c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b Grieves, N.; et al. (December 2018). "Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey". Monthly Notices of the Royal Astronomical Society. 481 (3): 3244–3265. arXiv:1803.11538. Bibcode:2018MNRAS.481.3244G. doi:10.1093/mnras/sty2431.
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
- ^ a b c Stassun, Keivan G.; et al. (March 2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 20. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. S2CID 119219062. 136.
- ^ "HD 88133". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-12-28.
- ^ a b Fischer, Debra A.; et al. (2005). "The N2K Consortium. I. A Hot Saturn Planet Orbiting HD 88133". The Astrophysical Journal. 620 (1): 481–486. Bibcode:2005ApJ...620..481F. doi:10.1086/426810.
- ^ Piskorz, Danielle; et al. (23 November 2016). "Evidence for the Direct Detection of the Thermal Spectrum of the Non-Transiting Hot Gas Giant HD 88133 b". The Astrophysical Journal. 832 (2). 131. arXiv:1609.09074. Bibcode:2016ApJ...832..131P. doi:10.3847/0004-637X/832/2/131.
- ^ Buzard, Cam; et al. (29 November 2021). "Reinvestigation of the Multiepoch Direct Detections of HD 88133 b and Upsilon Andromedae b". The Astronomical Journal. 162 (6). 269. arXiv:2109.13275. Bibcode:2021AJ....162..269B. doi:10.3847/1538-3881/ac2a2c.
- ^ Ment, Kristo; et al. (2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal. 156 (5). 213. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5. S2CID 119243619.