Target Description
    ==================
      HAT-P-4 is a star with a detected substellar companion, HAT-P-4 b,
      and is a target of the Extrasolar Planet Observation and
      CHaracterization (EPOCh) phase of the NASA EPOXI mission.  Other
      designations for this star are SAO 64638, BD+36 2593, and GSC
      02569-01599.  The star has the following astrometric and photometric
      properties:
 
        Spectral type        : F
        Apparent V Magnitude : 11.2
        Distance             : 310 (-/+30) pc
        Mass                 : 1.26 (-0.14/+0.06) solar masses
        Radius               : 1.59 (-/+0.07) solar radii
        RA                   : 15 19 57.927 (FK5, epoch and equinox 2000)
        Dec                  : +36 13 46.78 (FK5, epoch and equinox 2000)
 
      The substellar companion HAT-P-4 b was discovered in 2007 by the
      Hungarian-made Automated Telescope Network (HATNet).  The known
      properties of this extrasolar planet are:
 
        Mass               : 0.68 (-/+0.04) Jupiter masses
        Semi major axis    : 0.0446 (+/-0.0012) AU
        Orbital period     : 3.056536 (-/+5.7e-5) days
        Eccentricity       : 0
        Radius             : 1.27 (-/+0.05) Jupiter radii
        Inclination        : 89.9 (-2.2/+0.1) deg
 
      The astrometric and photometric properties were taken from the
      27 November 2008 update for this planetary system in the Extrasolar
      Planets Encyclopedia.  The encyclopedia is maintained by the Paris
      Observatory and is available online at http://exoplanet.eu.  Please
      consult this web site for the most up-to-date properties.