HR 9038

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]

HR 9038 AB
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension  23h 52m 25.31799s[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−B color index 0.70[2]
B−V color index 0.98[2]
R−I color index 0.5
Astrometry
Radial velocity (Rv)+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[1] mas
Distance35.5 ± 0.1 ly
(10.89 ± 0.04 pc)
Absolute magnitude (MV)6.77 / 7.16 / ?[3]
Absolute bolometric
magnitude (Mbol)		6.34 / 6.62 / ?[3]
Orbit[8]
PrimaryHR 9038 A
CompanionHR 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[5]
PrimaryHR 9038 Aa
CompanionHR 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
Mass0.70 M☉
Radius0.69 R☉
Surface gravity (log g)4.60 cgs
Temperature4820 K
Metallicity [Fe/H]-0.29 dex
HR 9038 Ab
Mass0.67 M☉
Radius0.66 R☉
Surface gravity (log g)4.62 cgs
Temperature4620 K
Other designations
BD+74° 1047, GJ 909, WDS J23524+7533
HR 9038 A: HD 223778, HIP 117712, HR 9038, SAO 10879
Database references
SIMBADA
B

References
  1. 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.
  2. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
  3. 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.
  4. 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.
  5. Pourbaix, D.; et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213.
  6. "GJ 909 B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 May 2017.
  7. 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.
  8. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory.
  9. 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, 62.


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