Add BeSS headers to a FITS file

bessify.py

#! /usr/bin/env python
import pyfits
import argparse

parser = argparse.ArgumentParser(
    description='Add BeSS FITS headers to a file')
parser.add_argument('filename', type=str, help='FITS filename')
parser.add_argument('--outfile', '-o', type=str, help='Output filename',
    required=True)

args = parser.parse_args()

f = pyfits.open(args.filename)
header = f[0].header
data = f[0].data

# Modify for your requirements
header.update('BSS_INST', 'GSO880+SA100+QHY5')
header.update('BSS_SITE', 'Christchurch-NZ')
header.update('BSS_VHEL',  0.)
header.update('BSS_COSM', 'no correction')
header.update('BSS_TELL', 'no correction')
header.update('BSS_NORM', 'none')

pyfits.writeto(args.outfile, data, header, output_verify='fix')