Location of HD 204521; not visible on this chart, but just to the west of
β Cephei (circled) | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cepheus |
Right ascension | 21h 25m 16.79696s [1] |
Declination | +70° 28′ 39.1434″ [1] |
Apparent magnitude (V) | 7.26 [2] ( binoculars) |
Characteristics | |
Spectral type | G0V [3] |
B−V color index | 0.619±0.015 [2] |
Astrometry | |
Radial velocity (Rv) | −76.78±0.12 [1] km/s |
Proper motion (μ) |
RA: +40.632
[1]
mas/
yr Dec.: +39.411 [1] mas/ yr |
Parallax (π) | 37.9375 ± 0.0155 mas [1] |
Distance | 85.97 ± 0.04
ly (26.36 ± 0.01 pc) |
Absolute magnitude (MV) | 5.15 [2] |
Details | |
Mass | 0.77±0.03 [4] or 0.997 [5] M☉ |
Radius | 0.92 [1] R☉ |
Luminosity | 0.76 [1] L☉ |
Surface gravity (log g) | 4.43±0.02 [4] cgs |
Temperature | 5,699±50 [4] K |
Metallicity [Fe/H] | −0.75±0.05 [4] dex |
Rotational velocity (v sin i) | 3.6 [6] km/s |
Age | 8.43±4.24 [7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 204521 is a star in the northern constellation of Cepheus. In the sky it positioned just to the west of the magnitude 3.2 star Beta Cephei (β Cep). This object has a yellow hue similar to the Sun but is too faint to be visible to the naked eye with an apparent visual magnitude of 7.26. [2] It is located at a distance of 86 light years from the Sun based on parallax, and has an absolute magnitude of 5.15. [2] The star is drifting closer with a radial velocity of −77 km/s, [2] and is predicted to come to within 7.96 light-years in 334,000 years. [5] At that distance the star can have a relatively small perturbing effect on comets in the Oort cloud. [9]
This is an ordinary G-type main-sequence star with a stellar classification of G0V, [3] indicating that it is generating energy through core hydrogen fusion. It is roughly 8 billion years old [7] and appears metal-deficient. [10] The mass of this star appears to be at or below that of the Sun, and it is radiating 76% of the Sun's luminosity from its photosphere at an effective temperature of 5,699 K. [4]
Location of HD 204521; not visible on this chart, but just to the west of
β Cephei (circled) | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cepheus |
Right ascension | 21h 25m 16.79696s [1] |
Declination | +70° 28′ 39.1434″ [1] |
Apparent magnitude (V) | 7.26 [2] ( binoculars) |
Characteristics | |
Spectral type | G0V [3] |
B−V color index | 0.619±0.015 [2] |
Astrometry | |
Radial velocity (Rv) | −76.78±0.12 [1] km/s |
Proper motion (μ) |
RA: +40.632
[1]
mas/
yr Dec.: +39.411 [1] mas/ yr |
Parallax (π) | 37.9375 ± 0.0155 mas [1] |
Distance | 85.97 ± 0.04
ly (26.36 ± 0.01 pc) |
Absolute magnitude (MV) | 5.15 [2] |
Details | |
Mass | 0.77±0.03 [4] or 0.997 [5] M☉ |
Radius | 0.92 [1] R☉ |
Luminosity | 0.76 [1] L☉ |
Surface gravity (log g) | 4.43±0.02 [4] cgs |
Temperature | 5,699±50 [4] K |
Metallicity [Fe/H] | −0.75±0.05 [4] dex |
Rotational velocity (v sin i) | 3.6 [6] km/s |
Age | 8.43±4.24 [7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HD 204521 is a star in the northern constellation of Cepheus. In the sky it positioned just to the west of the magnitude 3.2 star Beta Cephei (β Cep). This object has a yellow hue similar to the Sun but is too faint to be visible to the naked eye with an apparent visual magnitude of 7.26. [2] It is located at a distance of 86 light years from the Sun based on parallax, and has an absolute magnitude of 5.15. [2] The star is drifting closer with a radial velocity of −77 km/s, [2] and is predicted to come to within 7.96 light-years in 334,000 years. [5] At that distance the star can have a relatively small perturbing effect on comets in the Oort cloud. [9]
This is an ordinary G-type main-sequence star with a stellar classification of G0V, [3] indicating that it is generating energy through core hydrogen fusion. It is roughly 8 billion years old [7] and appears metal-deficient. [10] The mass of this star appears to be at or below that of the Sun, and it is radiating 76% of the Sun's luminosity from its photosphere at an effective temperature of 5,699 K. [4]