HR 9038

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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
Diameter0.69 D
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

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

  1. 1.0 1.1 1.2 1.3 1.4 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  2. 2.0 2.1 2.2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data.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. 3.0 3.1 3.2 3.3 3.4 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. 4.0 4.1 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. 5.0 5.1 5.2 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. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  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. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  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.


External links


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