Gliese 433

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)	110.65 ± 1.81 mas
Distance	29.5 ± 0.5 ly (9.0 ± 0.1 pc)
Absolute magnitude (MV)	10.01
Details
Mass	0.48 M☉
Radius	0.48±0.01 R☉
Luminosity	0.033±0.002 L☉
Surface gravity (log g)	4.42 cgs
Temperature	3550±100 K
Other designations
HIP 56528, GJ 433, CD-31 9113, LHS 2429, LTT 4290, NLTT 27914, SAO 202602
Database references
SIMBAD	data
Exoplanet Archive	data
Extrasolar Planets Encyclopaedia	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. A study described in a 2014 paper by Tuomi et al. confirms both detections.

The Gliese 433 planetary system

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	—	—