Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 23h 10m 29.22633s[1] |
Declination | +57° 01′ 46.0277″[1] |
Apparent magnitude (V) | 8.33[2] |
Characteristics | |
Evolutionary stage | giant[2] |
Spectral type | K3III |
B−V color index | 1.63 |
Astrometry | |
Radial velocity (Rv) | +8.57±0.05[1] km/s |
Proper motion (μ) | RA: 18.492[1] mas/yr Dec.: 6.883[1] mas/yr |
Parallax (π) | 2.6570 ± 0.0349 mas[1] |
Distance | 1,230 ± 20 ly (376 ± 5 pc) |
Absolute bolometric magnitude (Mbol) | +0.38[2] |
Details | |
Mass | 1.25±0.25[2] M☉ |
Radius | 25.46+1.16 −0.75[1] R☉ |
Luminosity | 152±3[1] L☉ |
Surface gravity (log g) | 2.31±0.11[2] cgs |
Temperature | 4,019+60 −90[1] K |
Metallicity [Fe/H] | −0.18±0.12[2] dex |
Rotation | > 654 days[2] |
Rotational velocity (v sin i) | < 1.0[2] km/s |
Age | 3.0+2.9 −1.5[3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
HD 240210 is a star in the northern constellation of Cassiopeia. It has an orange hue but is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.33.[2] Parallax measurements provide an estimate of its distance from the Sun as approximately 1,230 light years. It is drifting further away with a radial velocity of +8.6 km/s.[1]
This is an aging giant star with a class of K3,[2] which has exhausted the supply of hydrogen at its core and expanded to 25[1] times the radius of the Sun. It is around three[3] billion years old with 1.3[2] times the Sun's mass. The star is radiating 152 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,019 K.[1] It is spinning slowly, with each rotation taking at least 1.8 years.[2]
On June 10, 2009 a planet orbiting the star was discovered by Niedzielski et al. This exoplanet is a 6.9 or greater Jupiter mass planet. Evidence for additional planetary companions has been found.[5]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥ 6.90 MJ | 1.33 | 501.75±2.33 | 0.15±0.02 | — | — |
GaiaDR2
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