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Airmass.py
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Airmass.py
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#!/usr/bin/env python
# xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx #
# xxxxxxxxxxxxxxxxxxxxxxx-------------------------CALCULATION OF AIRMASS----------------------xxxxxxxxxxxxxxxxxxxxxxx #
# xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx #
# ------------------------------------------------------------------------------------------------------------------- #
# Import Required Libraries
# ------------------------------------------------------------------------------------------------------------------- #
import os
import glob
import re
import math
import ephem
import datetime
from pyraf import iraf
from astropy.io import fits
from astropy.coordinates import Angle
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Observatory Site Details
# ------------------------------------------------------------------------------------------------------------------- #
OBS_NAME = "Indian Astronomical Observatory, Hanle"
# OBS_LONG = 78.9642
# OBS_LAT = 32.7794
OBS_LONG = '78:57:51'
OBS_LAT = '32:46:46'
OBS_ALT = 4486
OBS_TIMEZONE = +5.5
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Telescope CCD Specifications
# ------------------------------------------------------------------------------------------------------------------- #
read_noise = 4.87
ccd_gain = 1.22
data_max = 55000
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Image Header Keywords
# ------------------------------------------------------------------------------------------------------------------- #
RA_keyword = 'RA'
DEC_keyword = 'DEC'
date_keyword = 'DATE-OBS'
grism_keyword = 'GRISM'
filter_keyword = 'IFILTER'
object_keyword = 'OBJECT'
airmass_keyword = 'AIRMASS'
exptime_keyword = 'EXPTIME'
time_start_keyword = 'TM_START'
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Object Details
# ------------------------------------------------------------------------------------------------------------------- #
name_object = 'ASASSN14dq'
RA_object = '21:57:59.9'
DEC_object = '+24:16:08.1'
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Location Of AIRMASS File
# ------------------------------------------------------------------------------------------------------------------- #
FILE_AIRMASS = '/home/avinash/PyCharmProjects/Reduction_Pipeline/Airmass.asc'
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Standard Stars Details
# ------------------------------------------------------------------------------------------------------------------- #
mag_Feige110 = 11.83
RA_Feige110 = '23:19:58.4'
DEC_Feige110 = '-05:09:56.2'
mag_Feige34 = 11.18
RA_Feige34 = '10:39:36.7'
DEC_Feige34 = '+43:06:09.3'
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Load Required IRAF Packages
# ------------------------------------------------------------------------------------------------------------------- #
iraf.noao(_doprint=0)
iraf.astutil(_doprint=0)
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Functions For File Handling
# ------------------------------------------------------------------------------------------------------------------- #
def group_similar_files(text_list, common_text, exceptions=''):
"""
Groups similar files based on the string "common_text". Writes the similar files
onto the list 'text_list' (only if this string is not empty) and appends the similar
files to a list 'python_list'.
Args:
text_list : Name of the output text file with names grouped based on the 'common_text'
common_text : String containing partial name of the files to be grouped
exceptions : String containing the partial name of the files that need to be excluded
Returns:
list_files : Python list containing the names of the grouped files
"""
list_files = glob.glob(common_text)
if exceptions != '':
list_exception = exceptions.split(',')
for file_name in glob.glob(common_text):
for text in list_exception:
test = re.search(str(text), file_name)
print file_name
if test:
try:
list_files.remove(file_name)
except ValueError:
pass
list_files.sort()
if len(text_list) != 0:
with open(str(text_list), "w") as f:
for index in range(0, len(list_files)):
f.write(str(list_files[index]) + "\n")
return list_files
def text_list_to_python_list(text_list):
"""
Returns data in the file 'text_list' as a python_list.
Args:
text_list : Input file containing filenames
Returns:
python_list : List of all the elements in the file 'text_list'
Raises:
Error : File 'text_list 'Not Found
"""
if os.path.isfile(text_list):
with open(text_list, "r+") as f:
python_list = f.read().split()
return python_list
else:
print "Error : File " + str(text_list) + " Not Found"
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Functions For Tasks In IRAF
# ------------------------------------------------------------------------------------------------------------------- #
def asthedit(text_list_edit, file_airmass):
"""
Calculates AIRMASS for the files in the list 'text_list_edit' using the commands file 'file_airmass'.
Also, appends AIRMASS, RA, DEC, JD etc. keywords to the header of the file 'file_name'.
Args:
text_list_edit : Text list of FITS files whose headers have to be appended with AIRMASS
file_airmass : AIRMASS file which has to be edited for date of observation
Returns:
None
"""
list_edit = text_list_to_python_list(str(text_list_edit))
task = iraf.noao.astutil.asthedit
task.unlearn()
task.verbose = "no" # Verbose Output?
task.update = "yes" # Update Image Header?
task.oldstyle = "no" # Use Old Style Format?
for file_name in list_edit:
edit_header(file_name)
edit_airmass_file(file_name, FILE_AIRMASS)
task(images=str(file_name), commands=str(file_airmass))
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Functions For Airmass Correction
# ------------------------------------------------------------------------------------------------------------------- #
def edit_airmass_file(file_name, file_airmass):
"""
Edits the 'DATE_OBS' variable in file 'file_airmass' based on the date of observation of the file 'file_name'.
Args:
file_name : FITS file from which date has to be extracted
file_airmass : AIRMASS file which has to be edited for date of observation
Returns:
None
"""
with open(str(file_airmass), 'r') as f:
f.readline()
rest_data = f.read()
# DATE_OBS = '2014-09-16'
file_header = fits.getheader(file_name)
date_obs = file_header[str(date_keyword)]
new_date = "DATE_OBS = " + "'" + str(date_obs) + "'" + "\n"
with open(str(file_airmass), 'w') as f:
f.write(new_date)
f.write(rest_data)
def edit_header(file_name):
"""
Edits the header of the file 'file_name' based on the object_keyword.
Args:
file_name : FITS file whose header has to be edited
Returns:
None
"""
(file_data, file_header) = fits.getdata(filename=str(file_name), header=True, ext=0)
object_value = file_header[str(object_keyword)]
date_obs = file_header[str(date_keyword)]
object_ra = RA_object
object_dec = DEC_object
if object_value == 'Feige110':
object_ra = RA_Feige110
object_dec = DEC_Feige110
elif object_value == 'Feige34':
object_ra = RA_Feige34
object_dec = DEC_Feige34
file_header.set('DATE_OBS', str(date_obs))
file_header.set(str(RA_keyword), object_ra)
file_header.set(str(DEC_keyword), object_dec)
fits.writeto(filename=str(file_name), data=file_data, header=file_header, clobber=True)
def calculate_airmass(file_name):
"""
Calculates AIRMASS for the FITS file and appends respective details in the header of the file 'file_name'
Args:
file_name : FITS file whose header has to be edited
Returns:
None
"""
hdulist = fits.open(file_name, mode='update')
file_header = hdulist[0].header
date_obs = file_header[str(date_keyword)]
time_start = file_header[str(time_start_keyword)]
object_ra = file_header[str(RA_keyword)]
object_dec = file_header[str(DEC_keyword)]
time_utc = str(datetime.timedelta(seconds=int(time_start)))
datetime_utc = str(date_obs) + ' ' + str(time_utc)
julian_day = ephem.julian_date(datetime_utc)
telescope = ephem.Observer()
telescope.lon = OBS_LONG
telescope.lat = OBS_LAT
telescope.elevation = OBS_ALT
telescope.pressure = 0
telescope.epoch = ephem.J2000
telescope.date = datetime_utc
object_pos = ephem.FixedBody()
object_pos._ra = object_ra
object_pos._dec = object_dec
object_pos._epoch = ephem.J2000
object_pos.compute(telescope)
time_sidereal = telescope.sidereal_time()
object_alt = Angle(str(object_pos.alt) + ' degrees').degree
airmass = 1 / math.cos(math.radians(90 - object_alt))
file_header.append('OBSERVAT', str(OBS_NAME))
file_header.append('LAT', str(OBS_LAT))
file_header.append('LONG', str(OBS_LONG))
file_header.append('ALT', str(OBS_ALT))
file_header.append('TIMEZONE', str(OBS_TIMEZONE))
file_header.append('DATE_OBS', str(date_obs))
file_header.append('UT', str(time_utc))
file_header.append('JD', str(julian_day))
file_header.append('ST', str(time_sidereal))
file_header.append('RA', str(object_ra))
file_header.append('DEC', str(object_dec))
file_header.append('ALT', str(object_pos.alt))
file_header.append('AZ', str(object_pos.az))
file_header.append('AIRMASS', str(airmass))
hdulist.close()
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# Calculates AIRMASS And Appends Respective Details In The Header
# ------------------------------------------------------------------------------------------------------------------- #
list_files = group_similar_files("list_files", common_text="*.fits")
for file_name in list_files:
calculate_airmass(file_name=file_name)
# asthedit("list_files", file_airmass=FILE_AIRMASS)
# ------------------------------------------------------------------------------------------------------------------- #
# ------------------------------------------------------------------------------------------------------------------- #
# AIRMASS Test Not Verified
# ------------------------------------------------------------------------------------------------------------------- #
# from PyAstronomy import pyasl
# from astropy.coordinates import SkyCoord, EarthLocation, AltAz
# from astropy.utils import iers
# iers.conf.auto_download = False
#
# lat_deg = Angle(OBS_LAT + ' degrees').degree
# long_deg = Angle(OBS_LONG + ' degrees').degree
# ra_deg, dec_deg = pyasl.coordsSexaToDeg(str(object_ra) + ' ' + str(object_dec))
#
# object_radec = SkyCoord(ra=ra_deg*u.deg, dec=dec_deg*u.deg, frame='icrs')
# telescope_loc = EarthLocation(lat=lat_deg*u.deg, lon=-long_deg*u.deg, height=OBS_ALT*u.m)
# utcoffset = OBS_TIMEZONE*u.hour
# time_utc = Time(str(date_obs) + ' ' + str(time_obs))
#
# object_altaz = object_radec.transform_to(AltAz(obstime=time_utc, location=telescope_loc))
# airmass = 1 / math.cos(math.radians(90 - object_altaz[0]))
# print object_radec
# print object_altaz
# print airmass
#
# from sidereal import JulianDate, SiderealTime
#
# JulianDate.fromDatetime(date_obs)
# SiderealTime
# ------------------------------------------------------------------------------------------------------------------- #