Notes for HD 128311

update: 29 March 2005

The planet(s):

• Detection method: Radial Velocity
• Basic data:

  Name:	HD 128311 b	HD 128311 c
  M.sini:	2.58 MJ	3.24 MJ ?
  Semi-major axis:	1.02	1.743 ?
  Orbital period:	420.514 d.	919. d. ?
  Eccentricity:	0.30	0.29
  Omega (deg):	223.	?
  T_peri (JD-2450000):	27.24	?
  Inclination:	-	-

• Remarks:
  23 Feb. 05: Planet c, presently unpublished, is problematic; its parameters are provisional.
• References:
  1. BEICHMAN C., BRYDEN G., PIEKE G., STANSBERRY J., TRILLING D., STAPELFELDT K., WERNER M., ENGELBRECHT C., BLAYLOCK M., GORDON K., CHEN C., SU K. & HINES D., 2004
     Planets and IR Excesses: Preliminary Results from a Spitzer MIPS Survey of Solar-Type Stars.
     ApJ. , 622, 1160
     paper
  2. BUTLER P., MARCY G., VOGT S., FISCHER D.,HENRY G., LAUGHLIN G. & WRIGHT J., 2003
     Seven New Keck Planets Orbiting G & K Dwarfs.
     ApJ., 582, 455
     paper
• Other Web pages:
  1. Velocity curve and data (California Planet Search Team)

The star:

• Distance: 16.6 pc
• Spectral type: K0
• Apparent magnitude: V = 7.51
• Metallicity: [Fe/H] = 0.08
• Mass (M_sun): M = 0.80
• Coordinates (2000):     RA = 14 36 00.5607       DEC = +09 44 47.466
• More data:
  • Basic Data (from simbad )
  • Most recent refs. (from ADS; enter ` HD 128311 ' in the `objects' field)