HD 24496

HD 24496 is a binary star^[9] system in the equatorial constellation of Taurus. The combined apparent visual magnitude of the pair is 6.81,^[1] which is too faint to be readily visible to the normal human eye. The system is located at a distance of 66.8 light-years from the Sun, based on parallax,^[2] and is drifting further away with a radial velocity of +19 km/s.^[1] It is traversing the celestial sphere with a proper motion of 0.276″ per year.^[10]

HD 24496

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Taurus[1]
Right ascension	03h 54m 28.03326s[2]
Declination	+16° 36′ 57.7897″[2]
Apparent magnitude (V)	6.81[1] (6.9 + 11.1)[3]
Characteristics
Spectral type	G7V[4] + M2V[5]
Apparent magnitude (B)	7.529[1]
Apparent magnitude (R)	6.40[1]
Apparent magnitude (I)	6.000[1]
Apparent magnitude (J)	5.384±0.024[1]
Apparent magnitude (H)	5.102±0.026[1]
Apparent magnitude (K)	4.995±0.017[1]
B−V color index	0.719±0.001[1]
Astrometry
Radial velocity (Rv)	+18.99±0.09[1] km/s
Proper motion (μ)	RA: +214.191[2] mas/yr Dec.: −167.336[2] mas/yr
Parallax (π)	48.8107±0.0474 mas[2]
Distance	66.82 ± 0.06 ly (20.49 ± 0.02 pc)
Absolute magnitude (MV)	5.26[1]
Orbit[6]
Primary	A
Companion	B
Period (P)	589+57 −84 years
Semi-major axis (a)	80.2+4.6 −7.8 au
Eccentricity (e)	0.099+0.130 −0.054
Inclination (i)	117.11+2.90 −0.91°
Longitude of the node (Ω)	38.7+1.2 −1.4°
Periastron epoch (T)	JD = 2577107+8299 −10043
Argument of periastron (ω) (secondary)	318+13 −32°
Details[7]
A
Mass	0.941±0.053[6] M☉
Radius	0.91±0.03 R☉
Luminosity	0.705+0.073 −0.076 L☉
Surface gravity (log g)	4.52+0.03 −0.04 cgs
Temperature	5,572±44 K
Metallicity [Fe/H]	−0.01±0.03 dex
Rotational velocity (v sin i)	0.0±0.5 km/s
Age	3.316+3.88 −3.16 Gyr
B
Mass	0.5389+0.0082 −0.0081[6] M☉
Other designations
BD+16°527, GC 4699, GJ 3255, HD 24496, HIP 18267, SAO 93662, PPM 119451, WDS J03545+1637, LTT 11292, NLTT 12133[8]
Database references
SIMBAD	data
	B

The magnitude 6.9^[3] primary star, designated component A, is a G-type main-sequence star with a stellar classification of G7V.^[4] It is around three billion years old with a low projected rotational velocity. The star has 96% of the mass of the Sun and 91% of the Sun's radius. The metallicity, what astronomers term the abundance of heavier elements, is about the same as in the Sun. The star is radiating 71% of the luminosity of the Sun from its photosphere at an effective temperature of 5,572 K.^[7]

The secondary companion, component B, is of magnitude 11.1^[3] red dwarf of class M2V^[5] that shares a common proper motion with the primary.^[11] They have an orbital separation of 80 astronomical units, taking 590 years to complete an orbit around their centre of mass.^[6]