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Details - VST Photometric H-a Survey of the Southern Galactic Plane (VPHAS+)

Position Name Description Data Type Data Size UCD Physical Unit
1 name Position-based source name. Not a unique identifier. STRING 27 meta.id
2 RAJ2000 Right Ascension in decimal degrees (J2000). DOUBLE 1 pos.eq.ra;meta.main deg
3 DEJ2000 Declination in decimal degrees (J2000). DOUBLE 1 pos.eq.dec;meta.main deg
4 sourceID Unique VPHAS source identifier in the format field-extension-number. STRING 14 meta.id;meta.main
5 primaryID sourceID of the preferred catalogue entry for this source. STRING 14 meta.id.parent
6 primary_source Flag =1 if the entry is the preferred observation of a unique source INT8 1 meta.code
7 nObs Number of observations of this source in the survey. INT8 1 meta.number
8 clean =1 if clean_g, clean_r2, clean_ha, clean_r and clean_i are true. INT8 1 meta.code.qual
9 u_g (u - g) colour index, formed by subtracting columns u and g. FLOAT 1 phot.color;em.opt.U;em.opt.B mag
10 g_r2 (g - r2) colour index, formed by subtracting columns g and r2. FLOAT 1 phot.color;em.opt.B;em.opt.R mag
11 r_i (r - i) colour index, formed by subtracting columns r and i. FLOAT 1 phot.color;em.opt.R;em.opt.I mag
12 r_ha (r - Halpha) colour index, formed by subtracting columns r and ha. FLOAT 1 phot.color;em.opt.R;em.line.Halpha mag
13 clean_u =1 if the u-band detection is significant and the PSF fit good. INT8 1 meta.code.qual;em.opt.U
14 u Default u-band VEGA magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.U;meta.main mag
15 u_AB Default u-band AB magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.U mag
16 err_u Statistical uncertainty for u. Not including systematics. FLOAT 1 stat.error;em.opt.U mag
17 chi_u Goodness of the PSF fit in u, as determined by DAOPHOT ALLSTAR. FLOAT 1 stat.fit.chi2;em.opt.U
18 warning_u Flags problems encountered while fitting the PSF, if any. STRING 12 meta.code.qual;em.opt.U
19 aperMag_u u-band VEGA magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.U mag
20 aperMag_u_AB u-band AB magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.U mag
21 aperMagErr_u Statistical uncertainty for aperMag_u. Not including systematics. FLOAT 1 stat.error;em.opt.U mag
22 snr_u Ratio of the signal in the aperture relative to the background. FLOAT 1 stat.snr;em.opt.U
23 magLim_u The Vega magnitude a SNR=3 source would have at this position. FLOAT 1 stat.max;phot.mag;em.opt.U mag
24 psffwhm_u Typical PSF FWHM in the CCD frame. FLOAT 1 instr.det.psf;stat.mean;em.opt.U arcsec
25 mjd_u Modified Julian Date at the start of the u-band exposure. DOUBLE 1 time.epoch;em.opt.U days
26 detectionID_u Detection identifier: night-#exposure-#extension-#number. STRING 23 meta.id;em.opt.U
27 clean_g =1 if the g-band detection is significant and the PSF fit good. INT8 1 meta.code.qual;em.opt.B
28 g Default g-band VEGA magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.B;meta.main mag
29 g_AB Default g-band AB magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.B mag
30 err_g Statistical uncertainty for g. Not including systematics. FLOAT 1 stat.error;em.opt.B mag
31 chi_g Goodness of the PSF fit in g, as determined by DAOPHOT ALLSTAR. FLOAT 1 stat.fit.chi2;em.opt.B
32 warning_g Flags problems encountered while fitting the PSF, if any. STRING 12 meta.code.qual;em.opt.B
33 aperMag_g g-band VEGA magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.B mag
34 aperMag_g_AB g-band AB magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.B mag
35 aperMagErr_g Statistical uncertainty for aperMag_g. Not including systematics. FLOAT 1 stat.error;em.opt.B mag
36 snr_g Ratio of the signal in the aperture relative to the background. FLOAT 1 stat.snr;em.opt.B
37 magLim_g The Vega magnitude a SNR=3 source would have at this position. FLOAT 1 stat.max;phot.mag;em.opt.B mag
38 psffwhm_g Typical PSF FWHM in the CCD frame. FLOAT 1 instr.det.psf;stat.mean;em.opt.B arcsec
39 mjd_g Modified Julian Date at the start of the g-band exposure. DOUBLE 1 time.epoch;em.opt.B days
40 detectionID_g Detection identifier: night-#exposure-#extension-#number. STRING 23 meta.id;em.opt.B
41 clean_r2 =1 if the r2-band detection is significant and the PSF fit good. INT8 1 meta.code.qual;em.opt.R
42 r2 Second r-band VEGA magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.R mag
43 r2_AB Second r-band AB magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.R mag
44 err_r2 Statistical uncertainty for r2. Not including systematics. FLOAT 1 stat.error;em.opt.R mag
45 chi_r2 Goodness of the PSF fit in r2, as determined by DAOPHOT ALLSTAR. FLOAT 1 stat.fit.chi2;em.opt.R
46 warning_r2 Flags problems encountered while fitting the PSF, if any. STRING 12 meta.code.qual;em.opt.R
47 aperMag_r2 r2-band VEGA magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.R mag
48 aperMag_r2_AB r2-band AB magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.R mag
49 aperMagErr_r2 Statistical uncertainty for aperMag_r2. Not including systematics. FLOAT 1 stat.error;em.opt.R mag
50 snr_r2 Ratio of the signal in the aperture relative to the background. FLOAT 1 stat.snr;em.opt.R
51 magLim_r2 The Vega magnitude a SNR=3 source would have at this position. FLOAT 1 stat.max;phot.mag;em.opt.R mag
52 psffwhm_r2 Typical PSF FWHM in the CCD frame. FLOAT 1 instr.det.psf;stat.mean;em.opt.R arcsec
53 mjd_r2 Modified Julian Date at the start of the r2-band exposure. DOUBLE 1 time.epoch;em.opt.R days
54 detectionID_r2 Detection identifier: night-#exposure-#extension-#number. STRING 23 meta.id;em.opt.R
55 clean_ha =1 if the H-alpha detection is significant and the PSF fit good. INT8 1 meta.code.qual;em.line.Halpha
56 ha Default H-alpha VEGA magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.line.Halpha;meta.main mag
57 err_ha Statistical uncertainty for ha. Not including systematics. FLOAT 1 stat.error;em.line.Halpha mag
58 chi_ha Goodness of the PSF fit in H-alpha, as determined by DAOPHOT. FLOAT 1 stat.fit.chi2;em.line.Halpha
59 warning_ha Flags problems encountered while fitting the PSF, if any. STRING 12 meta.code.qual;em.line.Halpha
60 aperMag_ha H-alpha VEGA magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.line.Halpha mag
61 aperMagErr_ha Statistical uncertainty for aperMag_ha. Not including systematics. FLOAT 1 stat.error;em.line.Halpha mag
62 snr_ha Ratio of the signal in the aperture relative to the background. FLOAT 1 stat.snr;em.line.Halpha
63 magLim_ha The Vega magnitude a SNR=3 source would have at this position. FLOAT 1 stat.max;phot.mag;em.line.Halpha mag
64 psffwhm_ha Typical PSF FWHM in the CCD frame. FLOAT 1 instr.det.psf;stat.mean;em.line.Halpha arcsec
65 mjd_ha Modified Julian Date at the start of the H-alpha exposure. DOUBLE 1 time.epoch;em.line.Halpha days
66 detectionID_ha Detection identifier: night-#exposure-#extension-#number. STRING 23 meta.id;em.line.Halpha
67 clean_r =1 if the r-band detection is significant and the PSF fit good. INT8 1 meta.code.qual;em.opt.R
68 r Default r-band VEGA magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.R;meta.main mag
69 r_AB Default r-band AB magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.R mag
70 err_r Statistical uncertainty for r. Not including systematics. FLOAT 1 stat.error;em.opt.R mag
71 chi_r Goodness of the PSF fit in r, as determined by DAOPHOT ALLSTAR. FLOAT 1 stat.fit.chi2;em.opt.R
72 warning_r Flags problems encountered while fitting the PSF, if any. STRING 12 meta.code.qual;em.opt.R
73 aperMag_r r-band VEGA magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.R mag
74 aperMag_r_AB r-band AB magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.R mag
75 aperMagErr_r Statistical uncertainty for aperMag_r. Not including systematics. FLOAT 1 stat.error;em.opt.R mag
76 snr_r Ratio of the signal in the aperture relative to the background. FLOAT 1 stat.snr;em.opt.R
77 magLim_r The Vega magnitude a SNR=3 source would have at this position. FLOAT 1 stat.max;phot.mag;em.opt.R mag
78 psffwhm_r Typical PSF FWHM in the CCD frame. FLOAT 1 instr.det.psf;stat.mean;em.opt.R arcsec
79 mjd_r Modified Julian Date at the start of the r-band exposure. DOUBLE 1 time.epoch;em.opt.R days
80 detectionID_r Detection identifier: night-#exposure-#extension-#number. STRING 23 meta.id;em.opt.R
81 clean_i =1 if the i-band detection is significant and the PSF fit good. INT8 1 meta.code.qual;em.opt.I
82 i Default i-band VEGA magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.I;meta.main mag
83 i_AB Default i-band AB magnitude obtained using PSF fitting. FLOAT 1 phot.mag;em.opt.I mag
84 err_i Statistical uncertainty for i. Not including systematics. FLOAT 1 stat.error;em.opt.I mag
85 chi_i Goodness of the PSF fit in i, as determined by DAOPHOT ALLSTAR. FLOAT 1 stat.fit.chi2;em.opt.I
86 warning_i Flags problems encountered while fitting the PSF, if any. STRING 12 meta.code.qual;em.opt.I
87 aperMag_i i-band VEGA magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.I mag
88 aperMag_i_AB i-band AB magnitude obtained using aperture photometry. FLOAT 1 phot.mag;em.opt.I mag
89 aperMagErr_i Statistical uncertainty for aperMag_i. Not including systematics. FLOAT 1 stat.error;em.opt.I mag
90 snr_i Ratio of the signal in the aperture relative to the background. FLOAT 1 stat.snr;em.opt.I
91 magLim_i The Vega magnitude a SNR=3 source would have at this position. FLOAT 1 stat.max;phot.mag;em.opt.I mag
92 psffwhm_i Typical PSF FWHM in the CCD frame. FLOAT 1 instr.det.psf;stat.mean;em.opt.I arcsec
93 mjd_i Modified Julian Date at the start of the i-band exposure. DOUBLE 1 time.epoch;em.opt.I days
94 detectionID_i Detection identifier: night-#exposure-#extension-#number. STRING 23 meta.id;em.opt.I
95 field Survey-specific identifier of the telescope pointing. STRING 5 obs.field;meta.id
96 ext OmegaCAM CCD extension used (1-32). INT8 1 obs.param;meta.id
97 l Galactic longitude in decimal degrees (IAU 1958 system). DOUBLE 1 pos.galactic.lon deg
98 b Galactic latitude in decimal degrees (IAU 1958 system). DOUBLE 1 pos.galactic.lat deg
99 nbDist Distance to the nearest neighbour detected in the same exposure. FLOAT 1 pos.angDistance arcsec