HD 33283

HD 33283 is a star in the southern constellation Lepus with one planet and a co-moving stellar companion.^[3] With an apparent visual magnitude of 8.05,^[2] the star is too faint to be seen with the naked eye. It is located at a distance of 294 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +4.5.^[2]

HD 33283

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Lepus
Right ascension	05h 08m 01.0123s[1]
Declination	−26° 47′ 50.8941″[1]
Apparent magnitude (V)	8.05[2]
Characteristics
Spectral type	G3/5V[2] + M4–5[3]
B−V color index	0.641±0.009[2]
Astrometry
Radial velocity (Rv)	+4.51±0.19[2] km/s
Proper motion (μ)	RA: 56.184[1] mas/yr Dec.: −46.058[1] mas/yr
Parallax (π)	11.0993±0.0286 mas[1]
Distance	293.9 ± 0.8 ly (90.1 ± 0.2 pc)
Absolute magnitude (MV)	3.19[2]
Details
HD 33283
Mass	1.39±0.04 M☉[4] 1.24±0.1[5] M☉
Radius	1.95±0.04 R☉[4] 1.20±0.1[5] R☉
Luminosity	4.37±0.02[4] L☉
Surface gravity (log g)	3.99±0.03[4] cgs
Temperature	5,985±57[4] K
Metallicity [Fe/H]	0.35±0.08[2] dex
Rotational velocity (v sin i)	1.09±0.26[6] km/s
Age	3.6±0.6[4] Gyr
HD 33283 B
Mass	0.17[3] M☉
Other designations
CD–26°2029, FK5 4470, Gaia DR2 2955981936912654592, GC 6286, HD 33283, HIP 23889, SAO 170100, PPM 75021, 2MASS J05080100-2647509[7]
Database references
SIMBAD	data

This is an ordinary G-type main-sequence star with a stellar classification of G3/5V.^[2] It is about 3.6 billion years old and is chromospherically inactive. The star is spinning slowly with a projected rotational velocity of 1 km/s^[6] and an estimated rotation period of about 55.5 days.^[5] It is larger and more massive than the Sun. HD 33283 is radiating over four times the luminosity of the Sun from its photosphere at an effective temperature of 5,985 K.^[4]

In 2014, a co-moving red dwarf companion star, HD 33283 B, of spectral class M4–M5 was detected at an angular separation of 55.7″, corresponding to a projected separation of 5,244 AU.^[3]

Planetary system

In 2006, J. A. Johnson and associates found a jovian planet orbiting HD 33283 with the radial velocity method.^[5] It is orbiting at a distance of 0.15 AU (22 Gm) from the host star with a period of 18.2 days and an eccentricity (ovalness) of 0.4.^[8]

The HD 33283 planetary system^[8]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥0.329±0.071 MJ	0.1508±0.0087	18.1991±0.0017	0.399±0.056	—	—

See also

• HD 33564
• HD 86081
• HD 224693
• List of extrasolar planets