Two planets orbiting 47 Ursa Majoris

Revised 15 August 2001


Doppler measurements exhibiting the two planets

The inner planet was discovered by Butler and Marcy (1996). Now, five additional years of observations have revealed a second, more distant companion, in a 7 year orbit: D.A. Fischer, G.W. Marcy, R.P. Butler, G.P. Laughlin, S. S.Vogt appearing ApJ 10 Jan 2002.

Orbital Parameters and Planet Mass
Lick Observatory

Data provided by California & Carnegie Planet Search Team

Planet Period (d) T_peri (JD-245000) ecc omega (deg) Vel Amp, K (m/s) M_sini (M_Jup) Semi-major axis (AU)
b 1089 +/- 3 3622 +/- 34 0.06 +/- 0.014 172 +/-15 49.3 +/- 1.2 2.54 2.09
c 2594 +/- 90 1363.5 +/- 493 0.1 +/-0.1 127 +/- 56 11.1 +/- 1.1 0.76 3.73

Link to Press Announcement - 15 August 2001


Spectral Type Mass
(M_sun)		 Apparent
magnitude		 Distance
(pc)		 P_rot
(d)		 [Fe/H]
G0V 1.03 5.03 14.08 22.00 -0.08

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