We report the detection of the first extrasolar planet , ET-1 ( HD 102195b ) , using the Exoplanet Tracker ( ET ) , a new generation Doppler instrument .
The planet orbits HD 102195 , a young star with solar metallicity that may be part of the local association .
The planet imparts radial velocity variability to the star with a semiamplitude of 63.4 \pm 2.0 m s ^ { -1 } and a period of 4.11 days .
The planetary minimum mass ( m \sin i ) is 0.488 \pm 0.015 M _ { J } .

The planet was initially detected in the spring of 2005 with the Kitt Peak National Observatory ( KPNO ) 0.9 m coudé feed telescope .
The detection was confirmed by radial velocity observations with the ET at the KPNO 2.1 m telescope and also at the 9 m Hobby-Eberly Telescope ( HET ) with its High Resolution Spectrograph .
This planetary discovery with a 0.9 m telescope around a V = 8.05 magnitude star was made possible by the high throughput of the instrument : 49 % measured from the fiber output to the detector .
The ET ’ s interferometer-based approach is an effective method for planet detection .
In addition , the ET concept is adaptable to multiple-object Doppler observations or very high precision observations with a cross-dispersed echelle spectrograph to separate stellar fringes over a broad wavelength band .

In addition to spectroscopic observations of HD 102195 , we obtained brightness measurements with one of the automated photometric telescopes ( APTs ) at Fairborn Observatory .
Those observations reveal that HD 102195 is a spotted variable star with an amplitude of \sim 0.015 mag and a 12.3 \pm 0.3 day period .
This is consistent with spectroscopically observed Ca ii H and K emission levels and line broadening measurements but inconsistent with rotational modulation of surface activity as the cause of the radial velocity variability .
Our photometric observations rule out transits of the planetary companion .