Gliese 433

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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
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
Proper motion (μ) RA:  –69.85 mas/yr
Dec.:  –852.54 mas/yr
Parallax (π) 110.65 ± 1.81 mas
Distance 29.5 ± 0.5 ly
(9.0 ± 0.1 pc)
Absolute magnitude (MV) 10.01
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
Rotation 73.2±16.0 d[2]
Other designations
HIP 56528, GJ 433, CD-31 9113, LHS 2429, LTT 4290, NLTT 27914, SAO 202602
Database references
Exoplanet Archive data
Extrasolar Planets
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[edit]

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.[3] A study described in a 2014 paper by Tuomi et al. confirms both detections.[4]

The Gliese 433 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >6.0 M 0.054 7.0 0.08
c 44.52 M 3.6 3693 0.17

See also[edit]


  1. ^ 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:0908.0944Freely accessible. Bibcode:2009A&A...505..859Z. doi:10.1051/0004-6361/200912479. 
  2. ^ 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:1506.08039Freely accessible, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441. 
  3. ^ "32 New Exoplanets Found". ESO News. ESO. Retrieved 15 February 2012. 
  4. ^ "Bayesian search for low-mass planets around nearby M dwarfs" (PDF). Mon. Not. R. Astron. Soc. 000, 1 – 31. RAS. Retrieved 18 February 2014. 

Coordinates: Sky map 11h 35m 26.9485s, −32° 32′ 23.900″