| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 23h 15m 42.22441s[1] |
| Declination | +58° 02′ 35.6705″[1] |
| Apparent magnitude (V) | 8.19[2] |
| Characteristics | |
| Spectral type | K2III[3] |
| B−V color index | 1.682±0.029[2] |
| Astrometry | |
| Radial velocity (Rv) | −24.82±0.04[1] km/s |
| Proper motion (μ) | RA: −0.203[1] mas/yr Dec.: −4.290[1] mas/yr |
| Parallax (π) | 1.0437 ± 0.0364 mas[1] |
| Distance | 3,100 ± 100 ly (960 ± 30 pc) |
| Details | |
| Mass | 1.69±0.42[3] or 0.61[4] M☉ |
| Radius | 78.13+7.31 −5.66[1] R☉ |
| Luminosity | 1,244±65[1] L☉ |
| Temperature | 3,878+148 −170[1] K |
| Metallicity [Fe/H] | −0.26±0.07[3] dex |
| Rotation | ≥ 1010 d[3] |
| Age | 270[3] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 240237 is a star in the northern constellation of Cassiopeia.[5] It is an orange star that can be viewed with binoculars or a small telescope, but is too faint to be seen with the naked eye at an apparent visual magnitude of 8.19.[2] This object is located at a distance of approximately 3,100 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −25 km/s.[1]
This is an aging giant star with a stellar classification of K2III;[3] a star that has exhausted the supply of hydrogen at its core and expanded to 78 times the radius of the Sun.[1] S. Gettel and associates (2011) estimate the star is around 270 million years old with 1.7 times the mass of the Sun.[3] However, S. G. Sousa and associates found a much lower mass of 0.61 times the mass of the Sun.[4] It is radiating 1,244 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,878 K.[1]
GaiaDR2 was invoked but never defined (see the help page).Anderson2012 was invoked but never defined (see the help page).Discovery was invoked but never defined (see the help page).Sousa2015 was invoked but never defined (see the help page).SIMBAD was invoked but never defined (see the help page).