48 Cassiopeiae

48 Cassiopeiae is a triple star system in the northern constellation of Cassiopeia. It is visible to the naked eye with a combined apparent visual magnitude of 4.49. With an annual parallax shift of 28.36±0.44 mas as seen from Earth's orbit, it is located approximately 115 light years away. The system is moving closer with a heliocentric radial velocity of −12.4 km/s.

48 Cassiopeiae
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 02h 01m 57.45035s
Declination +70° 54 25.2902
Apparent magnitude (V) 4.49
Characteristics
Spectral type A3 Va (A2 V + F2 V)
B−V color index 0.164±0.008
Astrometry
Radial velocity (Rv)−12.4 km/s
Proper motion (μ) RA: −55.69 mas/yr
Dec.: −8.71 mas/yr
Parallax (π)28.36 ± 0.44 mas
Distance115 ± 2 ly
(35.3 ± 0.5 pc)
Absolute magnitude (MV)1.75
Orbit
Primary48 Cas A
Companion48 Cas B
Period (P)61.14±0.05 yr
Semi-major axis (a)0.614±0.002
Eccentricity (e)0.355±0.001
Inclination (i)16.7±0.9°
Longitude of the node (Ω)48.2±3.2°
Periastron epoch (T)1964.35±0.09
Argument of periastron (ω)
(secondary)
19.5±3.6°
Details
48 Cas A
Mass1.93 M
Luminosity17.8+0.6
−1.2
 L
Surface gravity (log g)4.47 cgs
Temperature8,538±290 K
Metallicity [Fe/H]−0.4 dex
Rotational velocity (v sin i)61 km/s
Age376 Myr
48 Cas B
Mass1.17 M
Other designations
A Cassiopeiae, 48 Cas, BD+70° 153, HD 12111, HIP 9480, HR 575, SAO 4554, ADS 1598, CCDM J02020+7054, WDS J02020+7054AB
Database references
SIMBADdata

The primary component, designated 48 Cassiopeiae A, is a white A-type main-sequence star with a stellar classification of A2 V and an apparent magnitude of +4.65. It has a companion, component B, which is an F-type main-sequence star of class F2 V and an apparent magnitude of +6.74. This pair orbit around their common centre of mass once every 61.1 years. They have a semimajor axis of 0.614 arcseconds and an eccentricity of 0.355. A third companion, component C, is a magnitude 13.20 star located at an angular separation of 23.16 arcseconds as of 2014, or at least 816.5 AU away.

48 Cassiopeiae also has the Bayer designation A Cassiopeiae, the only star with a Latin letter designation in the constellation.

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