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HR 9038

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Ternary star system in the constellation Cepheus

HR 9038 AB
Observation data Epoch J2000 Equinox J2000
Constellation	Cepheus
Right ascension	23^h 52^m 25.31799^s^[1]
Declination	+75° 32′ 40.5141″^[1]
Apparent magnitude (V)	6.40^[2] (6.93 / 7.33)^[3] / 11.4^[4]
Characteristics
Spectral type	K3 V^[5] + K3 V^[5] + M2^[6]
U−Bcolor index	0.70^[2]
B−Vcolor index	0.98^[2]
R−Icolor index	0.5
Astrometry

Radial velocity (R_v)	+4.60^[7] km/s
Proper motion (μ)	RA: 341.01 [1]mas/yr Dec.: 41.50 [1]mas/yr
Parallax (π)	91.82±0.30 mas^[1]
Distance	35.5 ± 0.1 ly (10.89 ± 0.04 pc)
Absolute magnitude (M_V)	6.77 / 7.16 / ?^[3]
Absolute bolometric magnitude (M_bol)	6.34 / 6.62 / ?^[3]

Orbit^[8]
Primary	HR 9038 A
Companion	HR 9038 B
Period (P)	290.0yr
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^[5]
Primary	HR 9038 Aa
Companion	HR 9038 Ab
Period (P)	7.7531 d
Eccentricity (e)	0.0
Inclination (i)	~60^[3]°
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^[3]
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 atriple star system located thirty-five light-years away, in the constellationCepheus. Component A is aspectroscopic binary system with anorbital period of 7.753 days and a combined stellar classification of K3 V.^[9] Component B is ared dwarf star that orbits the primary pair every 290 years.^[4]

References

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^^a ^b ^c ^d ^evan 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^^a ^b ^cMermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data.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 ^eFuhrmann, 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 ^bMalkov, 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 ^cPourbaix, 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. Retrieved7 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 fromthe original on 2017-08-01. Retrieved2017-05-07.
^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.

External links

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"ARICNS: 01943 (A)".ARICNS.Centre of Astronomy,Heidelberg University.
"ARICNS: 01944 (B)".ARICNS.Centre of Astronomy,Heidelberg University.
NStars: 2352+7532^{[permanent dead link‍]}

Constellation of Cepheus

Stars

Bayer	α (Alderamin) β (Alfirk) γ (Errai) δ ε ζ η θ ι κ λ μ (Garnet Star) ν ξ (Kurhah) ο π ρ¹ ρ²
Flamsteed	7 9 11 14 16 19 24 2 UMi
Variable	AR T V W RW VV VW WZ DH DO MY PV S SS ST U V354 V381 V419
HR	597 881 7955 8281 8442 8702 8748 8938 9038
HD	1 197911 204521
Other	Gliese 809 WISE 0313+7807 WR 156 IRAS 23077+6707

Exoplanets	γ Cephei Ab (Tadmor) TOI-1431 b

Star
clusters

NGC	188 6939 7023 7129 7142 7160 7380 7419 7429 7510
Other	Palomar 1

Nebulae

NGC	NGC 40 NGC 7129 NGC 7139 NGC 7354 NGC 7538 NGC 7822
Other	Seahorse Nebula Elephant's Trunk Nebula Ghost Nebula Gyulbudaghian's Nebula IC 1396 Iris Nebula L1157 S 155 SSTGFLS J222557+601148

Galaxies

NGC	2276 2300 6952
Other	3C 61.1 4C +74.26 S5 0014+81 NVSS 2146+82 UGC 11861