Gliese 433
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 35m 26.9485s |
| Declination | −32° 32′ 23.900″ |
| Apparent magnitude (V) | 9.79 |
| Characteristics | |
| Spectral type | M1.5V |
| Apparent magnitude (U) | 12.508 |
| Apparent magnitude (B) | 11.28 |
| Apparent magnitude (R) | 8.821 |
| Apparent magnitude (I) | 7.664 |
| Apparent magnitude (J) | 6.471 |
| Apparent magnitude (H) | 5.856 |
| Apparent magnitude (K) | 5.623 |
| U−B color index | 1.23 |
| B−V color index | 1.49 |
| V−R color index | 0.97 |
| R−I color index | 1.157 |
| Astrometry | |
| Proper motion (μ) | RA: –69.85 mas/yr Dec.: –852.54 mas/yr |
| Parallax (π) | 109.57 ± 0.38 mas |
| Distance | 29.8 ± 0.1 ly (9.13 ± 0.03 pc) |
| Absolute magnitude (MV) | 10.01 |
| Details | |
| Mass | 0.48[1] M☉ |
| Radius | 0.48±0.01 R☉ |
| Luminosity | 0.033±0.002 L☉ |
| Surface gravity (log g) | 4.42 cgs |
| Temperature | 3,550±100 K |
| Metallicity | −0.02±0.05[2] |
| Rotation | 73.2±16.0 d[3] |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
Gliese 433 is a dim red dwarf star in the constellation of Hydra, roughly 29.5 light years away from the Sun. Astronomers have announced the discovery of a very low-mass extrasolar planet in close orbit.
Planetary system
Gliese 433 b is an extrasolar planet which orbits the star. This planet is a super-Earth with at least six times the mass of Earth and takes approximately seven days to orbit the star at a semimajor axis of approximately 0.056 AU. This planet was announced in a press release in October 2009, but no discovery paper has yet been made available.[4] A study described in a 2014 paper by Tuomi et al. confirms both detections.[5]
_Gliese_433_Star_system.png)
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >6.0 M🜨 | 0.054 | 7.0 | 0.08 | — | — |
| c | 44.52 M🜨 | 3.6 | 3693 | 0.17 | — | — |
See also
References
- ^ Zechmeister, M.; Kürster, M.; Endl, M. (August 6, 2009). "The M dwarf planet search programme at the ESO VLT + UVES. A search for terrestrial planets in the habitable zone of M dwarfs". Astronomy and Astrophysics. 505: 859–871. arXiv:0908.0944. Bibcode:2009A&A...505..859Z. doi:10.1051/0004-6361/200912479.
- ^ Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics. 604: A97. arXiv:1705.08785. Bibcode:2017A&A...604A..97L. doi:10.1051/0004-6361/201730715.
- ^ Suárez Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society, 452 (3): 2745–2756, arXiv:1506.08039, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441.
- ^ "32 New Exoplanets Found". ESO News. ESO. Retrieved 15 February 2012.
- ^ "Bayesian search for low-mass planets around nearby M dwarfs" (PDF). Mon. Not. R. Astron. Soc. 000, 1 – 31. RAS. Retrieved 18 February 2014.
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