48 Cassiopeiae

"A Cassiopeiae" redirects here. Not to be confused with α (alpha) Cassiopeiae.
48 Cassiopeiae
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 02h 01m 57.45035s[1]
Declination +70° 54′ 25.2902″[1]
Apparent magnitude (V) 4.49[2]
Characteristics
Spectral type A3 Va[3] (A2 V + F2 V)[4]
B−V color index 0.164±0.008[2]
Astrometry
Radial velocity (Rv)−12.4[5] km/s
Proper motion (μ) RA: −55.69[1] mas/yr
Dec.: −8.71[1] mas/yr
Parallax (π)28.36 ± 0.44 mas[1]
Distance115 ± 2 ly
(35.3 ± 0.5 pc)
Absolute magnitude (MV)1.75[2]
Orbit[6]
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[7] M☉
Luminosity17.8+0.6
−1.2[8] L☉
Surface gravity (log g)4.47[9] cgs
Temperature8,538±290[9] K
Metallicity [Fe/H]−0.4[5] dex
Rotational velocity (v sin i)61[8] km/s
Age376[9] Myr
48 Cas B
Mass1.17[7] 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[10]
Database references
SIMBADdata

48 Cassiopeiae is a triple star[11][7] system in the northern constellation of Cassiopeia. It is visible to the naked eye with a combined apparent visual magnitude of 4.49.[2] 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.[1] The system is moving closer with a heliocentric radial velocity of −12.4 km/s.[5]

The primary component, designated 48 Cassiopeiae A, is a white A-type main-sequence star with a stellar classification of A2 V[4] and an apparent magnitude of +4.65.[12] It has a companion, component B, which is an F-type main-sequence star of class F2 V[4] and an apparent magnitude of +6.74.[12] This pair orbit around their common centre of mass once every 61.1 years.[6] They have a semimajor axis of 0.614 arcseconds and an eccentricity of 0.355.[6] A third companion, component C, is a magnitude 13.20[12] star located at an angular separation of 23.16 arcseconds as of 2014, or at least 816.5 AU away.[7]

48 Cassiopeiae also has the Bayer designation A Cassiopeiae, the only star with a Latin letter designation in the constellation.[13]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Gray1989 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Edwards1976 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference gebran2016 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Hartkpof2006 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference derosa2014 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ a b c Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference cross was invoked but never defined (see the help page).