PGC55

pgc55 RA: 0.15583 Dec: 33.60094 Ra = 0.67 (arcmin) Rb = 0.20 (arcmin) PA = 13.12 (degrees)

# position angle (PA) [Degrees: Up=0, Left=90]"

run_sex <root> <ra> <dec>
./run_sex.csh pgc55_g 0.15583 33.60094

SExtractor first outputs

filter	RA	DEC	MAG	Re	Ra	Rb	b/a	PA
	deg	deg	mag	arcmin	arcmin	arcmin		deg

pgc55_u	0.1555	33.6014	17.03	0.17	0.75	0.20	0.27	9.30
pgc55_g	0.1555	33.6013	16.10	0.15	0.67	0.20	0.30	13.12
pgc55_r	0.1555	33.6012	15.74	0.15	0.63	0.20	0.31	13.20
pgc55_i	0.1555	33.6012	15.53	0.14	0.65	0.20	0.31	13.53
pgc55_z	0.1555	33.6012	15.61	0.12	0.50	0.14	0.28	12.21

GLGA-qa

minskywid = 27. / as_pix	; 27 arcsec is minimum sky width
factor= 1.5     ;  1.5
Sigma multiplier for thresshold (default =  2.5): 2.0
Magnitude faint limit (default =  24.0): 25

I increased the aperture size, until the difference between APR and ASY magnitudes are less than 0.05 mag.

SKY

• u

  final sky/px, skyerr/px     [mJy/px]:    0.00068215   0.00010009
  final musky, muskyerr  [AB mag/as^2]:     22.304     0.159
  

• g

  final sky/px, skyerr/px     [mJy/px]:    0.00083100   0.00003426
  final musky, muskyerr  [AB mag/as^2]:     22.090     0.045
  

• r

  final sky/px, skyerr/px     [mJy/px]:    0.00194121   0.00005404
  final musky, muskyerr  [AB mag/as^2]:     21.168     0.030
  

• i

  final sky/px, skyerr/px     [mJy/px]:    0.00371400   0.00009490
  final musky, muskyerr  [AB mag/as^2]:     20.464     0.028
  

• z

  final sky/px, skyerr/px     [mJy/px]:    0.01061923   0.00031765
  final musky, muskyerr  [AB mag/as^2]:     19.323     0.032