def load_VLAcals():
''' Read the list of VLA calibrators and create a list of RadioFixedBody objects containing
all calibrators.
The list contains 1865 calibrators as of 6/19/14. However, there are four with duplicate
names so when I add them to the aipy SrcCatalog it ends up containing only 1861 VLA
calibrators since you can't have two dictionary entries with the same key (the first one
just gets overwritten by the second). The sources with duplicate names are:
'1914+166', '0354+801', '0632+159', '1300+142'
The code to find these duplicate names is:
src_names = [s.src_name for s in srclist]
from collections import Counter
[s for s,n in Counter(src_names).items() if n>1]
I haven't looked at the calibrator list to figure out why there are duplicates - are these
distinct sources? If someone has an issue with this they will have to figure it out.
'''
cal_list = readvlacaldb()
srclist = []
for c in cal_list:
src = aipy.phs.RadioFixedBody(c.ra[0],
c.dec[0],
name=c.name,
epoch='2000')
srclist.append(src)
return srclist
def calibrator_tracktable(srcname,mjd1=None,mjd2=None):
'''Generate a tracktable for the given calibrator source (quasar).
This is just three lines giving the precessed RA, Dec coordinates.
'''
if mjd1 is None:
d = util.datime()
mjd1 = int(d.get())
mjd2 = mjd1 + 1.
cal = readvlacaldb()
for c in cal:
if c.name.find(srcname) == 0:
break
if srcname in c.name:
aa = eovsa_array()
aa.compute_pressure()
src = aipy.phs.RadioFixedBody(c.ra[0],c.dec[0],name=c.name,epoch='2000')
cat = aipy.phs.SrcCatalog(src)
tbl = ''
dt = 0.5/24.
mjd = mjd1 - 2*dt
while mjd < (mjd2+4*dt):
jultime = mjd + 2400000.5
aa.set_jultime(jultime)
cat.compute(aa)
msec = round((mjd % 1)*86400.)*1000.
tbl = tbl+'{:7d} {:7d} {:5d} {:8d}\n'.format(int(cat[c.name].ra*1800000./pi),
int(cat[c.name].dec*1800000./pi),
int(mjd),int(msec))
mjd = mjd + dt
return tbl
else:
return 'Source '+srcname+' not found'
def load_VLAcals():
''' Read the list of VLA calibrators and create a list of RadioFixedBody objects containing
all calibrators.
The list contains 1865 calibrators as of 6/19/14. However, there are four with duplicate
names so when I add them to the aipy SrcCatalog it ends up containing only 1861 VLA
calibrators since you can't have two dictionary entries with the same key (the first one
just gets overwritten by the second). The sources with duplicate names are:
'1914+166', '0354+801', '0632+159', '1300+142'
The code to find these duplicate names is:
src_names = [s.src_name for s in srclist]
from collections import Counter
[s for s,n in Counter(src_names).items() if n>1]
I haven't looked at the calibrator list to figure out why there are duplicates - are these
distinct sources? If someone has an issue with this they will have to figure it out.
'''
cal_list = readvlacaldb()
srclist = []
for c in cal_list:
src = aipy.phs.RadioFixedBody(c.ra[0],c.dec[0],name=c.name,epoch='2000')
srclist.append(src)
return srclist
def calibrator_tracktable(srcname, mjd1=None, mjd2=None):
'''Generate a tracktable for the given calibrator source (quasar).
This is just three lines giving the precessed RA, Dec coordinates.
'''
if mjd1 is None:
d = util.datime()
mjd1 = int(d.get())
mjd2 = mjd1 + 1.
cal = readvlacaldb()
for c in cal:
if c.name.find(srcname) == 0:
break
if srcname in c.name:
aa = eovsa_array()
aa.compute_pressure()
src = aipy.phs.RadioFixedBody(c.ra[0],
c.dec[0],
name=c.name,
epoch='2000')
cat = aipy.phs.SrcCatalog(src)
tbl = ''
dt = 0.5 / 24.
mjd = mjd1 - 2 * dt
while mjd < (mjd2 + 4 * dt):
jultime = mjd + 2400000.5
aa.set_jultime(jultime)
cat.compute(aa)
msec = round((mjd % 1) * 86400.) * 1000.
tbl = tbl + '{:7d} {:7d} {:5d} {:8d}\n'.format(
int(cat[c.name].ra * 1800000. / pi),
int(cat[c.name].dec * 1800000. / pi), int(mjd), int(msec))
mjd = mjd + dt
return tbl
else:
return 'Source ' + srcname + ' not found'
def whatup(minflux=7., dur=24., t=None, showtp=False):
''' Find out what sources are up at what times. Produces a plot with some
mouse interactivity (click once to activate, click a second time to deactivate)
Optional arguments:
minflux: low-flux cutoff for the plot
dur: duration in hours from the start time
t: Time() object giving start time of the plot, on None for current time.
showtp: If True, show total power sources. Default False
'''
os.chdir(os.path.expanduser('~') + '/Dropbox/PythonCode/Current')
if showtp:
srclist0 = ['Sun', 'Moon', 'CAS-A', 'CYG-A', 'TAU-A', 'VIR-A']
else:
srclist0 = ['Sun']
ntp = len(srclist0)
morelist = []
moreflux = []
# additional srclist from VLA calibrator catalogue
cal = readvlacaldb()
# find all bright sources with flux > 10 Jy at C band
for i, c in enumerate(cal):
if 'C' in c.band and c.flux[c.band.index('C')] > minflux:
morelist.append(c.name)
moreflux.append(c.flux[c.band.index('C')])
# sort the VLA cal src list by flux
morelist = [l for (f, l) in sorted(zip(moreflux, morelist))]
moreflux.sort()
moreflux.reverse()
morelist.reverse()
srclist = srclist0 + morelist
if t is None:
t = util.Time.now()
try:
float(dur)
except ValueError:
print 'Bad value for dur. Use default dur=8.'
dur = 8.
# Add times in 1-min steps up to duration dur (hours)
ts = t + TimeDelta(arange(0., dur, 1. / 60.) / 24., format='jd')
aa = eovsa_cat.eovsa_array_with_cat()
nt = len(ts)
ra = zeros((len(srclist), nt))
ha = zeros((len(srclist), nt))
dec = zeros((len(srclist), nt))
alt = zeros((len(srclist), nt))
for i in range(nt):
aa.set_jultime(ts[i].jd)
lst = aa.sidereal_time()
for j, srcname in enumerate(srclist):
src = aa.cat[srcname]
src.compute(aa)
ra[j, i] = src.ra
ha[j, i] = lst - src.ra
dec[j, i] = src.dec
alt[j, i] = src.alt
ra_deg = deg(ra)
ha_deg = deg(ha)
dec_deg = deg(dec)
alt = deg(alt)
eq_alt = copy.deepcopy(alt)
az_alt = copy.deepcopy(alt)
colors = cm.rainbow(np.linspace(0, 1, len(srclist)))
f = plt.figure(figsize=(10, 6))
ax = plt.subplot(111)
for j in range(len(srclist)):
#idx=where(abs(ha_deg[j]) < 55.)[0]
bad, = where(abs(ha_deg[j]) > 55.) # Back to nominal +/- 55 HA
eq_alt[j, bad] = nan
#ax.plot_date(ts.plot_date[idx],alt[j,idx],'-',linewidth=6,color=colors[j])
ax.plot_date(ts.plot_date,
eq_alt[j],
'-',
linewidth=6,
color=colors[j]) #,alpha=0.5)
for j in range(len(srclist)):
# Plot thin lines
ax.plot_date(ts.plot_date, alt[j], '-', color=colors[j])
for j in range(len(srclist)):
bad, = where(
abs(alt[j]) < 10.) # Eliminate points < 10-degrees altitude
az_alt[j, bad] = nan
# Plot width = 2 lines
ax.plot_date(ts.plot_date,
az_alt[j],
'-',
linewidth=2,
color=colors[j])
for j in range(len(srclist)):
# Replot width = 6 lines
ax.plot_date(ts.plot_date,
eq_alt[j],
'-',
linewidth=6,
color=colors[j]) #,alpha=0.5)
srclegend = []
for i, s in enumerate(srclist):
if i < ntp:
srclegend.append(s)
else:
srclegend.append(s + ' ({0:.1f} Jy)'.format(moreflux[i - ntp]))
ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d %H:%M'))
ax.set_ylim([0, 90])
def format_coord(x, y, ts, srclist, alt):
col = np.argmin(np.absolute(ts.plot_date - x))
nsrc, nt = alt.shape
if col >= 0 and col < len(ts):
tm = ts.plot_date[col]
ft = mdates.DateFormatter('%Y-%m-%d %H:%M')
timstr = str(ft(tm))
# find out source name at the given time
alt_t = alt[:, col]
ind = np.argmin(np.absolute(alt_t - y))
srcname = srclist[ind]
ra0 = np.degrees(ra[ind, col]) / 15.
ha0 = ha_deg[ind, col] / 15.
dec0 = dec_deg[ind, col]
if ind < ntp:
return '{2} (RA:{3:.1f}h, HA:{4:.1f}h, DEC:{5:.1f}d)'.format(
timstr, y, srcname, ra0, ha0, dec0)
else:
flux = moreflux[ind - ntp]
return '{2} ({6:.1f}Jy RA:{3:.1f}h, HA:{4:.1f}h, DEC:{5:.1f}d)'.format(
timstr, y, srcname, ra0, ha0, dec0, flux)
else:
return 'x = {0:.1f}, y = {1:.1f}'.format(x, y)
# ax.format_coord = format_coord
plt.xticks(rotation=40)
box = ax.get_position()
ax.set_position(
[box.x0 - 0.05, box.y0 + 0.15, box.width * 0.82, box.height * 0.85])
ax.legend(srclegend,
loc='center left',
bbox_to_anchor=(1., 0.5),
fancybox=True,
shadow=True)
ax.set_xlabel('UTC Time')
ax.set_ylabel('Altitude (deg)')
ax.set_title('Bright sources visible by EOVSA 27-m Antenna')
txt = tt.tooltip(f, ax, format_coord, ts, srclist, alt)
def whatup(minflux=7., dur=24., t=None, showtp=False):
''' Find out what sources are up at what times. Produces a plot with some
mouse interactivity (click once to activate, click a second time to deactivate)
Optional arguments:
minflux: low-flux cutoff for the plot
dur: duration in hours from the start time
t: Time() object giving start time of the plot, on None for current time.
showtp: If True, show total power sources. Default False
'''
os.chdir(os.path.expanduser('~')+'/Dropbox/PythonCode/Current')
if showtp:
srclist0 = ['Sun','Moon','CAS-A','CYG-A','TAU-A','VIR-A']
else:
srclist0 = ['Sun']
ntp = len(srclist0)
morelist = []
moreflux = []
# additional srclist from VLA calibrator catalogue
cal = readvlacaldb()
# find all bright sources with flux > 10 Jy at C band
for i, c in enumerate(cal):
if 'C' in c.band and c.flux[c.band.index('C')] > minflux:
morelist.append(c.name)
moreflux.append(c.flux[c.band.index('C')])
# sort the VLA cal src list by flux
morelist=[l for (f,l) in sorted(zip(moreflux,morelist))]
moreflux.sort()
moreflux.reverse()
morelist.reverse()
srclist = srclist0 + morelist
if t is None:
t = util.Time.now()
try:
float(dur)
except ValueError:
print 'Bad value for dur. Use default dur=8.'
dur = 8.
# Add times in 1-min steps up to duration dur (hours)
ts = t + TimeDelta(arange(0.,dur,1./60.)/24.,format='jd')
aa = eovsa_cat.eovsa_array_with_cat()
nt = len(ts)
ra = zeros((len(srclist),nt))
ha = zeros((len(srclist),nt))
dec = zeros((len(srclist),nt))
alt = zeros((len(srclist),nt))
for i in range(nt):
aa.set_jultime(ts[i].jd)
lst = aa.sidereal_time()
for j,srcname in enumerate(srclist):
src = aa.cat[srcname]
src.compute(aa)
ra[j,i] = src.ra
ha[j,i] = lst - src.ra
dec[j,i] = src.dec
alt[j,i] = src.alt
ra_deg = deg(ra)
ha_deg = deg(ha)
dec_deg = deg(dec)
alt = deg(alt)
eq_alt = copy.deepcopy(alt)
az_alt = copy.deepcopy(alt)
colors = cm.rainbow(np.linspace(0, 1, len(srclist)))
f=plt.figure(figsize=(10,6))
ax=plt.subplot(111)
for j in range(len(srclist)):
#idx=where(abs(ha_deg[j]) < 55.)[0]
bad, = where(abs(ha_deg[j]) > 55.) # Back to nominal +/- 55 HA
eq_alt[j,bad] = nan
#ax.plot_date(ts.plot_date[idx],alt[j,idx],'-',linewidth=6,color=colors[j])
ax.plot_date(ts.plot_date,eq_alt[j],'-',linewidth=6,color=colors[j])#,alpha=0.5)
for j in range(len(srclist)):
# Plot thin lines
ax.plot_date(ts.plot_date,alt[j],'-',color=colors[j])
for j in range(len(srclist)):
bad, = where(abs(alt[j]) < 10.) # Eliminate points < 10-degrees altitude
az_alt[j,bad] = nan
# Plot width = 2 lines
ax.plot_date(ts.plot_date,az_alt[j],'-',linewidth=2,color=colors[j])
for j in range(len(srclist)):
# Replot width = 6 lines
ax.plot_date(ts.plot_date,eq_alt[j],'-',linewidth=6,color=colors[j])#,alpha=0.5)
srclegend=[]
for i,s in enumerate(srclist):
if i < ntp:
srclegend.append(s)
else:
srclegend.append(s + ' ({0:.1f} Jy)'.format(moreflux[i-ntp]))
ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d %H:%M'))
ax.set_ylim([0,90])
def format_coord(x, y, ts, srclist, alt):
col = np.argmin(np.absolute(ts.plot_date - x))
nsrc, nt = alt.shape
if col >= 0 and col < len(ts):
tm = ts.plot_date[col]
ft = mdates.DateFormatter('%Y-%m-%d %H:%M')
timstr = str(ft(tm))
# find out source name at the given time
alt_t = alt[:, col]
ind = np.argmin(np.absolute(alt_t - y))
srcname = srclist[ind]
ra0 = np.degrees(ra[ind, col])/15.
ha0 = ha_deg[ind, col]/15.
dec0 = dec_deg[ind, col]
if ind < ntp:
return '{2} (RA:{3:.1f}h, HA:{4:.1f}h, DEC:{5:.1f}d)'.format(timstr, y, srcname, ra0, ha0, dec0)
else:
flux=moreflux[ind-ntp]
return '{2} ({6:.1f}Jy RA:{3:.1f}h, HA:{4:.1f}h, DEC:{5:.1f}d)'.format(timstr, y, srcname, ra0, ha0, dec0, flux)
else:
return 'x = {0:.1f}, y = {1:.1f}'.format(x,y)
# ax.format_coord = format_coord
plt.xticks(rotation=40)
box = ax.get_position()
ax.set_position([box.x0-0.05, box.y0+0.15, box.width * 0.82, box.height * 0.85])
ax.legend(srclegend,loc='center left', bbox_to_anchor=(1., 0.5),
fancybox=True, shadow=True)
ax.set_xlabel('UTC Time')
ax.set_ylabel('Altitude (deg)')
ax.set_title('Bright sources visible by EOVSA 27-m Antenna')
txt = tt.tooltip(f, ax, format_coord, ts, srclist, alt)
