Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius [1] |
Right ascension | 23h 29m 32.08207s [2] |
Declination | −04° 31′ 57.8915″ [2] |
Apparent magnitude (V) | 6.26 [3] |
Characteristics | |
Spectral type | K3IIIv [4] |
U−B color index | +1.20 [3] |
B−V color index | +1.10 [3] |
Astrometry | |
Radial velocity (Rv) | −26.53±1.94 [4] km/s |
Proper motion (μ) | RA: +181.03 [2] mas/yr Dec.: −232.23 [2] mas/yr |
Parallax (π) | 21.14±0.56 mas [2] |
Distance | 154 ± 4 ly (47 ± 1 pc) |
Absolute magnitude (MV) | +2.89 [1] |
Details | |
Radius | 5 [4] R☉ |
Luminosity | 8.9 [4] L☉ |
Surface gravity (log g) | 3.1 [4] cgs |
Temperature | 4,592 [4] K |
Metallicity [Fe/H] | +0.11 [4] dex |
Rotational velocity (v sin i) | 2.2 [4] km/s |
Other designations | |
BD−05°5999, FK5 3881, HD 221148, HIP 115953, HR 8924, LTT 9560, SAO 146736 | |
Database references | |
SIMBAD | data |
HD 221148 is suspected variable star in the equatorial constellation of Aquarius. The spectrum of the star shows exceptionally strong levels of CN; one of the highest cyanogen indices measured. [5]
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: CS1 maint: postscript (link)