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HD 123

HD 123
Location of HD 123 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
HD 123A
Right ascension 00h 06m 15.81387s[1]
Declination +58° 26′ 12.1073″[1]
Apparent magnitude (V) 6.42[2]
HD 123B
Right ascension 00h 06m 15.71057s[3]
Declination +58° 26′ 12.6457″[3]
Apparent magnitude (V) 7.32[2]
Characteristics
Spectral type G3V[4] + (G8V[5] + early MV[4])
B−V color index 0.70 (A), 0.97 (B)[2]
Astrometry
HD 123A
Radial velocity (Rv)−11.7 ± 2[6] km/s
Proper motion (μ) RA: 237.578[1] mas/yr
Dec.: 37.174[1] mas/yr
Parallax (π)48.1027 ± 0.0398 mas[1]
Distance67.80 ± 0.06 ly
(20.79 ± 0.02 pc)
HD 123B
Radial velocity (Rv)−16.0 ± 5[6] km/s
Proper motion (μ) RA: 237.578[3] mas/yr
Dec.: 37.174[3] mas/yr
Parallax (π)47.0168 ± 0.1936 mas[3]
Distance69.4 ± 0.3 ly
(21.27 ± 0.09 pc)
Orbit[7]
PrimaryHD 123A
CompanionHD 123B
Period (P)106.83 yr
Semi-major axis (a)1.455±0.004"
(29.5±0.6 AU[7])
Orbit[4]
PrimaryHD 123Ba
CompanionHD 123Bb
Period (P)47.685±0.003 d
Eccentricity (e)0.610±0.024
Periastron epoch (T)MJD 49891.00±0.22
Argument of periastron (ω)
(secondary)		290±4°
Details[4]
HD 123A
Mass0.98 M☉
HD 123Ba
Mass~0.86[a] M☉
Radius~0.87 (assumed)[7] R☉
Rotational velocity (v sin i)4.7[5] km/s
HD 123Bb
Mass~0.31[a] M☉
Other designations
V640 Cassiopeiae, AG+58°10, BD+57°2865, GC 88, GJ 9001, HD 123, HIP 518, HR 5, SAO 21085, PPM 25002, ADS 61 AB, CCDM J00063+5826AB, WDS J00063+5826AB, G 243-13, LTT 10022, NLTT 213, TIC 347304641, 2MASS J00061575+5826128, WISEA J000616.14+582613.3, EUVE J0006+58.4, GJ 4.1, USNO-B1.0 1484-00003998[8]
HD 123A: BD+57°2865A, Gaia DR3 423075173680043904, GJ 9001 A, HD 123A, ADS 61 A, WDS J00063+5826A, TIC 604446831, TYC 3664-1986-1, GJ 4.1 A, PMSC 00010+5752A[9]
HD 123B: BD+57°2865B, Gaia DR3 423075173674854528, GJ 9001 B, HD 123B, ADS 61 B, WDS J00063+5826B, TYC 3664-1986-2, GJ 4.1 B, PMSC 00010+5752Bab[10]
Database references
SIMBADHD 123
HD 123A
HD 123B

HD 123 is a hierarchical triple star system in the deep northern constellation of Cassiopeia. It consists of a visual binary between HD 123A and B, of which component B is itself a spectroscopic binary (Ba & Bb). Through the use of a telescope, the visual pair can be resolved, with a separation that varies between 0.5 and 1.6 arcseconds. With a combined apparent magnitude of 5.98, it is faintly visible to the naked eye under dark skies as a yellow-hued star.[4] The system is located approximately 70 light-years (21 pc) distant according to Hipparcos parallax measurements,[11] while the Gaia EDR3 parallaxes for the individual stars point towards slightly closer distances of 67.8 ly (20.8 pc) and 69.4 ly (21.3 pc), respectively. It is trending closer towards the Solar System at a heliocentric radial velocity of −13.79 km/s.[12]

  1. ^ a b c d e Cite error: The named reference EDR3_A was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Fabricius2002 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference EDR3_B was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Griffin1999 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Strassmeier1999 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference GCRV was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Weber1998 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD_A was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD_B was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).


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