HR 297
Solitary star in the constellation Cassiopeia
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HR 297 is a solitary star in the northern circumpolar constellation of Cassiopeia. It has an apparent visual magnitude of 5.8,[3] making it faintly visible to the naked eye from dark suburban skies. Parallax measurements put this system at a distance of roughly 256 light years.[2] It is drifting closer with a heliocentric radial velocity of −20.4 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 01h 04m 19.451s[2] |
| Declination | +61° 34′ 48.66″[2] |
| Apparent magnitude (V) | 5.84[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[2] |
| Spectral type | F6V[4] |
| U−B color index | +0.11[3] |
| B−V color index | +0.56[3] |
| Astrometry | |
| Radial velocity (Rv) | −20.40[5] km/s |
| Proper motion (μ) | RA: −79.837 mas/yr[2] Dec.: −24.915 mas/yr[2] |
| Parallax (π) | 12.7218±0.0301 mas[2] |
| Distance | 256.4 ± 0.6 ly (78.6 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.30[6] |
| Details | |
| Mass | 1.953[4] M☉ |
| Radius | 4.52±0.15[4] R☉ |
| Luminosity | 25.16±1.59[4] L☉ |
| Surface gravity (log g) | 3.86[7] cgs |
| Temperature | 6,089±35[4] K |
| Metallicity [Fe/H] | −0.01[4] dex |
| Rotational velocity (v sin i) | 42.0[8] km/s |
| Age | 1.3[4] Gyr |
| Other designations | |
| BD+60°158, HD 6210, HIP 5021, SAO 11557[9] | |
| Database references | |
| SIMBAD | data |
This is an F-type main sequence star with a stellar classification of F7V.[4] Because of the stability of this star, it is used as a standard in the photometric WBVR system.[10] The angular diameter of this star has been measured directly using the CHARA Array, yielding an estimate of 4.5 times the diameter of the Sun. Stellar models suggest a mass equal to about twice that of the Sun, with 25 times the Sun's luminosity.[4]
This is a young star with an estimated age of 1.3 billion years.[11] It is rotating rapidly, with a projected rotational velocity of 42 km/s.[8] The abundance of elements other than hydrogen and helium is about the same as that in the Sun. The effective temperature of the stellar atmosphere is 6,089 K,[4] giving it the yellow-white hued glow of an F-type star.[11]
This star has been examined for the presence of an infrared excess, but no statistically significant amount was detected. The detection of such an excess can indicate the presence of a dusty circumstellar disk.[12]