[Proj] Newbie problem

[Tiger Wings]

Hi

I've a geotiff metdata as below:

PCS = 26916 (NAD83 / UTM zone 16N)
Projection = 16016 (UTM zone 16N)
Projection Method: CT_TransverseMercator
   ProjNatOriginLatGeoKey: 0.000000 (  0d 0' 0.00"N)
   ProjNatOriginLongGeoKey: -87.000000 ( 87d 0' 0.00"W)
   ProjScaleAtNatOriginGeoKey: 0.999600
   ProjFalseEastingGeoKey: 500000.000000 m
   ProjFalseNorthingGeoKey: 0.000000 m
GCS: 4269/NAD83
Datum: 6269/North American Datum 1983
Ellipsoid: 7019/GRS 1980 (6378137.00,6356752.31)
Prime Meridian: 8901/Greenwich (0.000000/  0d 0' 0.00"E)
Projection Linear Units: 9001/metre (1.000000m)

When I tried command like this:
%>proj +proj=tmerc +lat_0=0 +lon_0=-87 k=0.9996 +x_0=500000 +y_0=0

I was told:
Rel. 4.4.9, 29 Oct 2004
<proj>:
projection initialization failure
cause: major axis or radius = 0 or not given
program abnormally terminated

Did I miss something?

Thanks a lot.

T. W.