Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cepheus |
Right ascension | 23h 27m 00.91338s [1] |
Declination | 87° 18′ 27.0304″ [1] |
Apparent magnitude (V) | 5.56 [2] |
Characteristics | |
Spectral type | A8III [3] or A7IV [4] |
B−V color index | 0.250±0.004 [2] |
Astrometry | |
Radial velocity (Rv) | −10.9±2.9 [2] km/s |
Proper motion (μ) |
RA: +75.736
[1]
mas/
yr Dec.: +16.724 [1] mas/ yr |
Parallax (π) | 10.3023 ± 0.0957 mas [1] |
Distance | 317 ± 3
ly (97.1 ± 0.9 pc) |
Absolute magnitude (MV) | 0.52 [2] |
Details | |
Mass | 2.25? [5] M☉ |
Radius | 3.98+0.11 −0.13 [1] R☉ |
Luminosity | 44.3±0.5 [1] L☉ |
Temperature | 7466+217 −105 [1] K |
Rotational velocity (v sin i) | 110 [4] km/s |
Age | ~900 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 221525 is a single [7] star near the north celestial pole [5] in the constellation Cepheus. At an apparent magnitude of 5.56, [2] it can be seen with the naked eye under dark skies. It is about 30 times fainter than the nearby prominent star Polaris. [8] Based upon parallax measurements, HD 221525 is located at a distance of approximately 317 light years from the Sun, [1] but is drifting closer with a radial velocity of −11 km/s. [2]
This object is an A-type star with a stellar classification of A7IV [4] or A8III, [3] suggesting it is an evolving star on the subgiant or giant branch, respectively. It has a relatively high rate of spin, showing a projected rotational velocity of 110 km/s. [4] The star has four [1] times the radius of the Sun and is radiating 44 [1] times the Sun's luminosity from its photosphere at an effective temperature of 7,466 K. [1]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cepheus |
Right ascension | 23h 27m 00.91338s [1] |
Declination | 87° 18′ 27.0304″ [1] |
Apparent magnitude (V) | 5.56 [2] |
Characteristics | |
Spectral type | A8III [3] or A7IV [4] |
B−V color index | 0.250±0.004 [2] |
Astrometry | |
Radial velocity (Rv) | −10.9±2.9 [2] km/s |
Proper motion (μ) |
RA: +75.736
[1]
mas/
yr Dec.: +16.724 [1] mas/ yr |
Parallax (π) | 10.3023 ± 0.0957 mas [1] |
Distance | 317 ± 3
ly (97.1 ± 0.9 pc) |
Absolute magnitude (MV) | 0.52 [2] |
Details | |
Mass | 2.25? [5] M☉ |
Radius | 3.98+0.11 −0.13 [1] R☉ |
Luminosity | 44.3±0.5 [1] L☉ |
Temperature | 7466+217 −105 [1] K |
Rotational velocity (v sin i) | 110 [4] km/s |
Age | ~900 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 221525 is a single [7] star near the north celestial pole [5] in the constellation Cepheus. At an apparent magnitude of 5.56, [2] it can be seen with the naked eye under dark skies. It is about 30 times fainter than the nearby prominent star Polaris. [8] Based upon parallax measurements, HD 221525 is located at a distance of approximately 317 light years from the Sun, [1] but is drifting closer with a radial velocity of −11 km/s. [2]
This object is an A-type star with a stellar classification of A7IV [4] or A8III, [3] suggesting it is an evolving star on the subgiant or giant branch, respectively. It has a relatively high rate of spin, showing a projected rotational velocity of 110 km/s. [4] The star has four [1] times the radius of the Sun and is radiating 44 [1] times the Sun's luminosity from its photosphere at an effective temperature of 7,466 K. [1]