Cannot pass one target to is_observable(); "FixedTarget object is not Iterable" #296

from astroplan import (AltitudeConstraint, AirmassConstraint,
                       AtNightConstraint)
constraints = [AltitudeConstraint(10*u.deg, 80*u.deg),
               AirmassConstraint(5), AtNightConstraint.twilight_civil()]
from astroplan import is_observable, is_always_observable, months_observable
ever_observable = is_observable(constraints, gemini, trappist1, time_range=np.array(ttv_f.jd))

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-192-e65ff56ff8a5> in <module>()
      4                AirmassConstraint(5), AtNightConstraint.twilight_civil()]
      5 from astroplan import is_observable, is_always_observable, months_observable
----> 6 ever_observable = is_observable(constraints, gemini, trappist1, time_range=np.array(ttv_f.jd))

/Users/lweiss/anaconda/lib/python2.7/site-packages/astroplan/constraints.pyc in is_observable(constraints, observer, targets, times, time_range, time_grid_resolution)
    855                                       time_range=time_range,
    856                                       time_grid_resolution=time_grid_resolution)
--> 857                            for constraint in constraints]
    858     constraint_arr = np.logical_and.reduce(applied_constraints)
    859     return np.any(constraint_arr, axis=1)

/Users/lweiss/anaconda/lib/python2.7/site-packages/astroplan/constraints.pyc in __call__(self, observer, targets, times, time_range, time_grid_resolution)
    221                 targets = FixedTarget(coord=targets)
    222 
--> 223         return self.compute_constraint(times, observer, targets)
    224 
    225     @abstractmethod

/Users/lweiss/anaconda/lib/python2.7/site-packages/astroplan/constraints.pyc in compute_constraint(self, times, observer, targets)
    281 
    282     def compute_constraint(self, times, observer, targets):
--> 283         cached_altaz = _get_altaz(times, observer, targets)
    284         alt = cached_altaz['altaz'].alt
    285         if self.boolean_constraint:

/Users/lweiss/anaconda/lib/python2.7/site-packages/astroplan/constraints.pyc in _get_altaz(times, observer, targets, force_zero_pressure)
     67 
     68     # convert times, targets to tuple for hashing
---> 69     aakey = (tuple(times.jd), tuple(targets))
     70 
     71     if aakey not in observer._altaz_cache:

TypeError: 'FixedTarget' object is not utterable