Notes for gamma Cephei

alias HD 222404

by Jean Schneider

update: 9 October 2002

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The planet(s):

• Detection method: Radial Velocity
• Basic data:

  Name:	gamma Cephei b
  M.sini:	1.76 MJ
  Semi-major axis:	~ 2.1 AU
  Orbital period:	903 ± 6 d.
  Eccentricity:	0.2 ± 0.07
  Omega (deg):	75.6 ± 18.7
  T_peri (JD-2450000):	53156.850894529 ± 52.4
  Inclinaison:	-

• Remarks:
  27 September 02: The star is part of a binary system with period 70 yrs ± 16 yrs, with an eccentricity of 0.4 ± 0.06 (Cochran et al 2002).
  More data on the binary star at youngstars.mpe.mpg.de/PlanetenAGB/PUT/gamma_Cep_facts.html.
• References:
  1. CAMPBELL B., WALKER G. & YANG S., 1988
     A search for substellar companions to solar-type stars.
     ApJ., 331, 902
     abstract
  2. COCHRAN W., HATZES A., ENDL M., PAULSON D., WALKER G., CAMPBELL B. & YANG S., 2002
     A Planetary Companion to the Binary Star Gamma Cephei.
     in 34^th DPS Meeting.
     BAAS, 34, 42.02
     abstract
  3. HABING H., GOMINIK C., JOURDAIN DE MUIZON M., LAUREIJS R., KESSLER M., LEECH K., METCALF L., SALAMA A., SIEBENMORGEN R., TRAMS N. & BOUCHET P., 2001
     Incidence and survival of remnant disks around main-sequence stars.
     Astron. & Astrophys., 365, 545
     paper
  4. HATZES A., COCHRAN W., ENDL M., PAULSON D., WALKER G. & McARTHUR B., 2002
     A Planetary Companion to the Binary Star Gamma Cephei.
     in Planetary Systems and their Formation Workshop from the Deutsche Astronomische Gesellschaft Meeting (Sep. 24 2002)
     abstract
  5. LAWTON A. & WRIGHT P., 1989
     A planetary system for Gamma Cephei?
     JBIS, 42, 335
     abstract
  6. PAULSON D., SAAR S., COCHRAN W. & HATZES A., 2002
     Searching for Planets in the Hyades II: Some Implications of Stellar Magnetic Activity.
     Astron. J., 124, 572
     paper
  7. WALKER G., BOHLENDER D., WALKER A., IRWIN A. W., LARSON A. M., YANG S. L. S. & LARSON A., 1992
     Gamma Cephei - Rotation or planetary companion?
     ApJ. Letters, 396, L91
     abstract
  8. WALKER G. A. H., WALKER A. R., IRWIN A. W., LARSON A. M., YANG S. L. S. & RICHARDSON D. C., 1995
     A search for Jupiter-mass companions to nearby stars
     Icarus, 116, 359
     paper
• Other Web pages:
  1. Deutsche Astronomische Gesellschaft data
  2. Tautenburg Observatory press release (13 Sep. 2002)
  3. Graphical representation the the stellar and planetary orbits.
  4. McDonald Observatory data

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The star:

• Distance: 11.8 pc
• Spectral type: KII V
• Apparent magnitude: V = 3.225
• Metallicity: [Fe/H] = 0
• Mass (M_sun): M =
• Coordinates (2000):     RA = 23 39 20.8490       DEC = +77 37 56.193
• More data:
  • Basic Data (from simbad )
  • Most recent refs. (from ADS; enter ` HD 222404 ' in the `objects' field)

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