hdf geodata format

Hi,
I've got an hdf file with the following metadata describing the
projection. Could someone please what standard is being used? It is
hdf output from TeraScan. Thanks.

center_lat\units: std_latitude
equator_radius: 6378.137
projection: 6
line\coord: y
projection_name: mercator
line\offset: 0
center_lon: -64
sample\scale: 1
line\scale: 1
proj_param: 0
shape: 1200 1500
map_angle\units: radians
proj_param\units: std_latitude
sample\coord: x
flattening: 0
equator_radius\units: km
et_affine: -0.8983112 0 0 0.8983112 600.5 750.5
sample\offset: 0
map_angle: 0
center_lon\units: std_longitude
center_lat: 42
nvalid: 1373993