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HR 9038 AB
Observation data; Epoch J2000 Equinox J2000
Constellation	Cepheus
Right ascension	23h 52m 25.31799s
Declination	+75° 32′ 40.5141″
Apparent magnitude (V)	6.40 (6.93 / 7.33) / 11.4
Characteristics
Spectral type	K3 V + K3 V + M2
U−B color index	0.70
B−V color index	0.98
R−I color index	0.5
Astrometry
Radial velocity (Rv)	+4.60 km/s
Proper motion (μ)	RA: 341.01 mas/yr ; Dec.: 41.50 mas/yr
Parallax (π)	91.82 ± 0.30 mas
Distance	35.5 ± 0.1 ly ; (10.89 ± 0.04 pc)
Absolute magnitude (MV)	6.77 / 7.16 / ?
Absolute bolometric; magnitude (Mbol)	6.34 / 6.62 / ?
Orbit
Primary	HR 9038 A
Companion	HR 9038 B
Period (P)	290.0 yr
Semi-major axis (a)	4.14″
Eccentricity (e)	0.55
Inclination (i)	49.58°
Longitude of the node (Ω)	93.91°
Periastron epoch (T)	2015.0
Argument of periastron (ω); (secondary)	134.14°
Orbit
Primary	HR 9038 Aa
Companion	HR 9038 Ab
Period (P)	7.7531 d
Eccentricity (e)	0.0
Inclination (i)	~60°
Periastron epoch (T)	2420001.264
Argument of periastron (ω); (secondary)	0.0°
Semi-amplitude (K1); (primary)	39.9 km/s
Semi-amplitude (K2); (secondary)	49.7 km/s
Details
HR 9038 Aa
Mass	0.70 M☉
Radius	0.69 R☉
Surface gravity (log g)	4.60 cgs
Temperature	4820 K
Metallicity [Fe/H]	-0.29 dex
HR 9038 Ab
Mass	0.67 M☉
Radius	0.66 R☉
Surface gravity (log g)	4.62 cgs
Temperature	4620 K
Metallicity [Fe/H]	-0.29 dex
Other designations
	BD+74° 1047, GJ 909, WDS J23524+7533
	HR 9038 A: HD 223778, HIP 117712, HR 9038, SAO 10879
Database references
SIMBAD	A
	B

HR 9038 is a triple star system located thirty-five light-years away, in the constellation Cepheus. Component A is a spectroscopic binary system with an orbital period of 7.753 days and a combined stellar classification of K3 V.^[9] Component B is a red dwarf star that orbits the primary pair every 290 years.^[4]

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
^ ^a ^b ^c ^d ^e Fuhrmann, Klaus (2008). "Nearby stars of the Galactic disc and halo - IV". Monthly Notices of the Royal Astronomical Society. 384 (1): 173–224. Bibcode:2008MNRAS.384..173F. doi:10.1111/j.1365-2966.2007.12671.x.
^ ^a ^b Malkov, O. Yu.; et al. (2012), "Dynamical masses of a selected sample of orbital binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69.
^ ^a ^b ^c Pourbaix, D.; et al. (2004). "S_B⁹: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
^ "GJ 909 B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 May 2017.
^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2017-05-07.
^ Allen, Peter R.; et al. (August 2012), "Low-mass Tertiary Companions to Spectroscopic Binaries. I. Common Proper Motion Survey for Wide Companions Using 2MASS", The Astronomical Journal, 144 (2): 12, arXiv:1206.4289, Bibcode:2012AJ....144...62A, doi:10.1088/0004-6256/144/2/62, S2CID 51051184, 62.