HD 37605 is a star in the equatorial constellation of Orion. It is orange in hue but is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.67.^[2] Parallax measurements yield a distance estimate of 152 light years from the Sun. It has a high proper motion^[3] and is drifting closer with a radial velocity of −22 km/s.^[1]

This object is a K-type main-sequence star with a stellar classification of K0 V.^[3] It is an inactive, metal-rich star. Age estimates range from 1.8^[4] up to 7^[3] billion years old, and it is spinning with a projected rotational velocity of 4.5 km/s.^[6] The star has 98% of the mass of the Sun and 89% of the Sun's radius. It is radiating 60% of the luminosity of the Sun from its photosphere at an effective temperature of 5,380 K.^[4]

There are two giant planets known in orbit. Planet b was discovered in 2004^[8] and planet c was discovered eight years later. The planets do not transit relative to Earth; b's maximum inclination is 88.1%.^[3][9]

In a simulation, HD 37605 b's orbit "sweeps clean" most test particles within 0.5 AU; leaving only asteroids "in low-eccentricity orbits near the known planet’s apastron distance, near the 1:2 mean-motion resonance" with oscillating eccentricity up to 0.06, and also at 1:3 with oscillating eccentricity up to 0.4. Also, observation has ruled out planets heavier than 0.7 Jupiter mass with a period of one year or less; which still allows for planets at 0.8 AU or more.^[10]