HD 24496
Binary star system in the constellation Taurus
From Wikipedia, the free encyclopedia
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]
| 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 |
| Name | 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]