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sn1987a_time_peptest.py
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#----------------------------------------------------------
# Misc. Functions for handling dates and times related to sn1987a
#
#
#
#
# Contains the following functions:
#
# get_obs_time
# convert_time
# convert_units
#
#----------------------------------------------------------
#----------------------------------------------------------
#----------------------------------------------------------
# get_obs_time()
#
# Author: Kari A. Frank
# Date: June 16, 2014
# Purpose: Look up sn1987a age for the given observation.
# Usage: get_obs_time(obsid)
#
# Input:
# obsid -- string or integer of observation id number, may include leading zeroes.
#
# get -- string specifying the format of the returned value.
# allowed values: 'age' (default), 'year','month','day','date'
# all but 'date' will return an integer (date returns as a string)
#
# Output:
# - returns int(day#),int(year),int(month),int(day),or str(date)
#
# Usage Notes:
# - only works for observations which the age has already been calculate
# for. to add more observations, add them to the list below.
def get_obs_time(obsid, get='age'):
#---------------------------------------
# Import Modules
#---------------------------------------
#---------------------------------------
# Define Look-up Lists
#---------------------------------------
obsid = int(obsid)
# observations = [1387,122,1967,1044,2831,2832,3829,3830,4614,4615,5579,5580,6668,6669,7636,7637,9142,9144,10855,10926,11090,13131,12539,12540,13735,14697,14698,15809,14417,10222]
# days = [4608,4711,5036,5175,5406,5559,5789,5978,6157,6358,6529,6713,6913,7094,7270,7445,7524,7799,8000,8232,8433,8617,8796,8975,9165,9523,9523,9713,9885,9168,8169]
# info = [(1387,4608),(122,4711),(1967,5036),(1044,5175),(2831,5406),(2832,5559),(3829,5789),(3830,5978),(4614,6157),(4615,6358),(5579,6529),(5580,6713),(6668,6913),(6669,7094),(7636,7270),(7637,7445),(9142,7624),(9144,7799),(10855,8000),(10926,8232),(11090,8433),(13131,8617),(12539,8796),(12540,8975),(13735,9165),(14697,9523),(14698,9713),(15809,9885),(14417,9168),(10222,8169),(10130,7986),(9143,7801)]
info = [
(124,
4608,
'1999-10-60'),
(1387,
4608,
'1999-10-06'),
(122,
4711,
'2000-01-17'),
(1967,
5036,
'2000-12-07'),
(1044,
5175,
'2001-04-25'),
(2831,
5406,
'2001-12-12'),
(2832,
5559,
'2002-05-15'),
(3829,
5789,
'2002-12-31'),
(3830,
5978,
'2003-07-08'),
(4614,
6157,
'2004-01-02'),
(4615,
6358,
'2004-07-22'),
(5579,
6529,
'2005-01-09'),
(5580,
6713,
'2005-07-11'),
(6668,
6913,
'2006-01-28'),
(6669,
7094,
'2006-01-28'),
(7636,
7270,
'2007-01-19'),
(7637,
7445,
'2007-07-13'),
(9142,
7624,
'2008-01-09'),
(9144,
7799,
'2008-07-01'),
(10855,
8000,
'2009-01-18'),
(10926,
8232,
'2009-09-08'),
(11090,
8433,
'2010-03-28'),
(13131,
8617,
'2010-09-28'),
(12539,
8796,
'2011-03-25'),
(12540,
8975,
'2011-09-21'),
(13735,
9165,
'2012-03-28'),
(14697,
9523,
'2013-03-21'),
(14698,
9713,
'2013-09-28'),
(15809,
9885,
'2014-03-19'),
(14417,
9168,
'2012-04-01'),
(10222,
8169,
'2009-07-06'),
(10130,
7986,
'2009-01-05'),
(9143,
7801,
'2008-07-04'),
(6178,
6534,
'2005-01-13'),
(6345,
6718,
'2005-07-16'),
(9806,
7627,
'2008-01-11'),
(10852,
7994,
'2009-01-12'),
(10221,
7995,
'2009-01-13'),
(10853,
7997,
'2009-01-17'),
(10854,
7999,
'2009-01-17'),
(12125,
8423,
'2010-03-17'),
(12126,
8423,
'2010-03-17'),
(11091,
8619,
'2010-09-29'),
(14344,
8977,
'2011-09-22'),
(15810,
10071,
'2014-09-20'),
(17415,
10068,
'2014-09-17')]
observations, days, dates = zip(*info)
#---------------------------------------
# Find Matching Obsid and Return Value
#---------------------------------------
if get == 'age':
age = days[observations.index(obsid)]
return age
if get != 'age':
date = dates[observations.index(obsid)]
parts = date.split('-')
year = parts[0]
month = parts[1]
day = parts[2]
if get == 'date':
return date
if get == 'year':
return int(year)
if get == 'month':
return int(month)
if get == 'day':
return int(day)
#----------------------------------------------------------
#----------------------------------------------------------
#----------------------------------------------------------
# convert_units()
# Author: Kari A. Frank
# Date: July 24, 2014
# Purpose: Convert between sn1987a related units (arcsec, km, velocities)
# Usage: convert_sn1987a_time(val,fromunit,tounit)
#
# Input:
#
# val -- value to be converted
#
# fromunit -- string specifying units of the input val, 'r' (units output from
# image fitting),'pc' (in plane of sky),'arcsec','km','cm','r/yr' (velocity),
# 'arcsec/yr','km/yr','km/s','arcsec/day'
#
# tounit -- string specifying the units to convert val into. takes
# same values as from.
#
# Output:
# - returns the converted val
#
# Usage Notes:
# -
#
def convert_units(val, fromunit, tounit):
#---------------------------------------
# Import Modules
#---------------------------------------
import numpy as np
#---------------------------------------
# Set Constants
#---------------------------------------
#--constant to convert radius measurements into arcseconds
r_to_arcsec = 0.0147928866
#--constants to convert velocity into km/s--
kpc_to_km = 1000.0 * 3.0857 * 10.0 ** 13.0
pc_to_km = kpc_to_km / 1000.0
distance_kpc = 51.4 # Panagia2003
distance_km = distance_kpc * kpc_to_km
arcsec_to_radian = np.pi / (3600.0 * 180.0)
arcsec_to_km = arcsec_to_radian * distance_km
day_to_s = 24.0 * 3600.0
yr_to_s = 365.0 * day_to_s
km_to_cm = 100000
arcsecdays_to_kms = arcsec_to_km / day_to_s
#---------------------------------------
# Determine Input Type
#---------------------------------------
#---------------------------------------
# Convert Lengths
#---------------------------------------
if fromunit == 'r':
out = val * r_to_arcsec
if tounit == 'arcsec':
return out
if tounit == 'km':
return out * arcsec_to_km
if tounit == 'pc':
return out * 1000.0 * arcsec_to_km / kpc_to_km
if tounit == 'cm':
return out * arcsec_to_km * km_to_cm
if fromunit == 'pc':
if tounit == 'r':
return val * pc_to_km / arcsec_to_km / r_to_arcsec
if tounit == 'arcsec':
return val * pc_to_km / arcsec_to_km
if tounit == 'km':
return val * pc_to_km / arcsec_to_km
if tounit == 'cm':
return val * pc_to_km / arcsec_to_km * km_to_cm
if fromunit == 'arcsec':
if tounit == 'r':
return val / r_to_arcsec
if tounit == 'pc':
return val * arcsec_to_km / pc_to_km
if tounit == 'km':
return val * arcsec_to_km
if tounit == 'cm':
return val * arcsec_to_km * km_to_cm
if fromunit == 'km':
if tounit == 'r':
return val / arcsec_to_km / r_to_arcsec
if tounit == 'pc':
return val / pc_to_km
if tounit == 'arcsec':
return val / arcsec_to_km
if tounit == 'cm':
return val * km_to_cm
if fromunit == 'cm':
out = val / km_to_cm
if tounit == 'r':
return out / arcsec_to_km / r_to_arcsec
if tounit == 'pc':
return out / pc_to_km
if tounit == 'arcsec':
return out / arcsec_to_km
if tounit == 'cm':
return out * km_to_cm
if tounit == 'km':
return out
#---------------------------------------
# Convert Velocities
#---------------------------------------
if fromunit == 'r/yr':
# convert length units
if tounit == 'km/yr' or tounit == 'km/s':
out = convert_units(val, 'r', 'km')
if tounit == 'arcsec/yr' or tounit == 'arcsec/day':
out = convert_units(val, 'r', 'arcsec')
# convert time units
if tounit == 'km/s':
return out / yr_to_s
if tounit == 'arcsec/yr' or tounit == 'km/yr':
return out
if tounit == 'arcsec/day':
return (out / yr_to_s) * day_to_s
if fromunit == 'arcsec/yr':
# convert length units
if tounit == 'r':
out = val / r_to_arcsec
if tounit == 'km/yr' or tounit == 'km/s':
out = convert_units(val, 'arcsec', 'km')
if touniti == 'arcsec/day':
out = val
# convert time units
if tounit == 'r/yr' or tounit == 'km/yr':
return out
if tounit == 'km/s':
return out / yr_to_s
if tounit == 'arcsec/day':
return (out / yr_to_s) * day_to_s
if fromunit == 'km/yr':
# convert length units
if tounit == 'r/yr':
out = convert_units(val, 'km', 'r')
if tounit == 'arcsec/yr' or 'arcsec/day':
out = convert_units(val, 'km', 'arcsec')
if tounit == 'km/s':
out = val
# convert time units
if tounit == 'r/yr' or tounit == 'arcsec/yr':
return out
if tounit == 'km/s':
return out * yr_to_s
if tounit == 'arcsec/day':
return (out / yr_to_s) * day_to_s
if fromunit == 'km/s':
# convert length units
if tounit == 'r/yr':
out = convert_units(val, 'km', 'r')
if tounit == 'arcsec/yr' or tounit == 'arcsec/day':
out = convert_units(val, 'km', 'arcsec')
if tounit == 'km/yr':
out = val
# convert time units
if tounit == 'arcsec/day':
return out * day_to_s
else:
return out / yr_to_s
#----------------------------------------------------------
#----------------------------------------------------------
# convert_time()
# Author: Kari A. Frank
# Date: July 9, 2014
# Purpose: Convert between sn1987a age (days since explosion) and date (year-month-day)
# Usage: convert_sn1987a_time(age,get='date')
#
# Input:
# intime -- sn1987a age (day#) or year-month-day. age may be either
# int or string (it will be converted to string).
# year-month-day must be a string of format '1001-12-26'
#
# get -- string specifying the format of the returned value, if intime is age.
# allowed values: 'year','month','day','date' (default='date')
# all but 'date' will return an integer (date returns as a string)
#
# Output:
# - returns int(day#),int(year),int(month),int(day),or str(date)
#
# Usage Notes:
# -
#
def convert_time(intime, get='date'):
#---------------------------------------
# Import Modules
#---------------------------------------
import datetime as dt
#---------------------------------------
# Determine Input Type
#---------------------------------------
intime = str(intime)
times = intime.split('-')
inage = 0
indate = 0
if len(times) == 1:
inage = 1
if len(times) == 3:
indate = 1
get = 'age'
#-if intime is wrong format-
if (inage == 0) and (indate == 0):
print "ERROR: input time must be either age in days or 'year-month-day'. Quitting."
return 0
#---Set zero age = Feb. 23, 1987---
zero_date = dt.datetime(1987, 0o2, 23, 0, 0, 0)
#---------------------------------------
# Convert from Date to Age
#---------------------------------------
if indate == 1:
#--convert to datetime objects--
#-provided date-
thedate = dt.datetime.strptime(intime, '%Y-%m-%d')
#--calculate days in between--
age = (thedate - zero_date).days
#--Return age--
# returned as int
return age
#---------------------------------------
# Convert from Age to Date
#---------------------------------------
if inage == 1:
#--add age to zero_date--
newdate = zero_date + dt.timedelta(days=int(intime))
if get == 'date':
return newdate.strftime('%Y-%m-%d')
if get == 'year':
return newdate.year
if get == 'month':
return newdate.month
if get == 'day':
return newdate.day
#----------------------------------------------------------