Title: Photometric Calibration
1Photometric Calibration
- Jorge F. GarcÃa Yus
- GEMINI Observatory
- Barolo 2001
2GSC-II Photometric Calibration
- Calibrators
- GSPC-I
- B, V magnitudes and brighter than 15th
- TYCHO
- BTycho, VTycho magnitudes and brighter than
11.5th - GSPC-II
- B, V, R magnitudes and fainter as 20th
- Color transformations
- One pair for each pass band available
- Range of validate
3Cont.
- Photographic plate material and filters
- IIIaJGG385, IIIaFRG610, IIIaJGG395,
IIIaFOG590 - Scanning and digitalization
- GAMMA 1 and GAMMA 2, laser and white light
- Pipeline data processing
- SKYPROCESSOR
- INVENTORY
- DEBLENDER
- FINDCAT
- PHOTOSOL
- APPLY_CALYB
4GSC 2 Photometric Calibration from GSH files
5Number of calibrators per field
6Statistic are over estimated by known
problems.Stars with more than one color,
calibrators with poor astrometry and multiple
observations.
7Inconsistence in early reference catalogs version.
8UKST southern hemisphere material IIIaJGG395
(blue) and IIIaFOG590 (red)
9POSS-II northern hemisphere material IIIaJGG385
(blue) and IIIaFRG610 (red)
10POSS-II special constrains location of original
photometric calibrators are vignetted
11GSC 2.2.01 data photometric analyze
- From 1715 square degrees (full sky coverage)
- Rejected 77 southern fields where J magnitude are
not present (/- 10 galactic latitude, SMC and
LMC) 5 - Founded and rejected 32, plates with suspicious
photometry. (mainly large color residuals) - Total for analyze 1606 plates or 1606 square
degrees
12Faint Art. s cal dis err Plate Date Comment 19.5
19.6 3 805 0.7 0.10 XJ005 7-JAN-2000 18.7 18.7 4
855 0.6 0.11 XP005 23-NOV-1999 19.8 19.7 1 578 0.1
0.11 XJ007 19-DEC-2000 19.1 18.7 1 406 0.1 0.13 X
P007 7-JAN-2000 17.2 16.9 1 515 0.2 0.11 XJ016 7-J
AN-2000 No faint GSPC2 16.2 15.9 1 541 0.2 0.13 XP
016 7-JAN-2000 No faint GSPC2 17.1 16.8 1 413 0.1
0.09 XJ017 20-DEC-1999 No faint
GSPC2 17.7 17.5 2 293 0.1 0.13 XP017 14-OCT-1999 N
o faint GSPC2 19.8 19.8 1 404 0.3 0.10 XJ020 7-JAN
-2000 18.5 18.4 1 424 0.3 0.13 XP020 7-JAN-2000 20
.8 20.7 3 699 0.2 0.17 XJ057 20-DEC-1999 18.6 18.7
3 806 0.1 0.13 XP057 17-JAN-2000 20.2 20.1 1 698
0.2 0.15 XJ074 6-SEP-2000 10.9 11.3 1 86 0.0 0.14
XP074 1-NOV-1999 No GSPC2 20.6 20.7 1 627 0.0 0.11
XJ219 19-DEC-2000 19.8 19.9 1 356 0.1 0.11 XP219
18-JUL-2001 21.0 21.2 3 958 2.5 0.15 XJ288 28-OCT-
1999 17.4 17.2 2 77 0.3 0.18 XP288 27-DEC-2000 No
faint GSPC2 19.2 19.3 6 775 0.1 0.12 XJ340 8-MAR-2
000 low galactic latitude 17.6 17.5 0 1174 0.0 0.1
9 XP340 21-JUN-2000 No faint GSPC2 20.3 20.5 1 280
1.2 0.18 XJ428 6-JAN-2000 19.7 19.7 1 504 1.0 0.1
4 XP428 6-DEC-1999 20.4 20.2 4 675 0.1 0.10 XJ493
23-AUG-2000 19.2 19.3 2 610 0.0 0.11 XP493 20-OCT-
1999 20.8 20.8 2 324 0.2 0.10 XJ533 7-JAN-2000 18.
7 18.7 2 272 0.3 0.13 XP533 7-DEC-1999 20.3 20.4 1
166 0.4 0.11 XJ599 11-JAN-2000 18.4 18.3 1 177 0.
4 0.12 XP599 16-JAN-2001 18.4 18.1 2 134 0.2 0.08
XJ653 1-FEB-2000 17.4 17.2 2 150 0.2 0.12 XP653 16
-DEC-1999 No faint GSPC2 20.0 20.0 1 195 0.4 0.12
XJ660 6-JAN-2000 11.6 11.8 0 132 0.0 0.16 XP660 16
-DEC-1999 No GSPC2 20.7 20.6 2 246 1.3 0.16 XJ669
7-JAN-2000 19.0 18.8 1 201 1.9 0.12 XP669 2-DEC-20
00 20.2 20.1 5 2021 0.4 0.12 XJ701 18-DEC-2000 bad
matching? 17.9 17.7 1 762 0.7 0.08 XP701 28-OCT-1
999 19.4 19.2 1 1181 0.1 0.10 XJ773 5-OCT-2000 bad
matching? 18.4 18.4 2 209 0.6 0.13 XP773 24-JAN-2
000
13Faint Art. s cal dis err Plate Date Comment 20.6
20.7 1 402 0.2 0.16 XJ847 7-FEB-2000 20.2 20.1 1
328 0.3 0.15 XP847 22-NOV-1999 20.9 21.0 1 97 0.5
0.10 XJ880 14-JAN-2001 19.8 19.8 1 71 0.0 0.15 XP8
80 11-NOV-1999 19.9 19.8 2 272 0.3 0.13 XS016 12-J
AN-2000 20.8 20.4 1 579 0.0 0.13 S016 30-JAN-2001
19.8 19.6 1 432 0.1 0.15 XS162 10-DEC-1999 21.0 21
.1 1 1003 0.1 0.16 S162 21-DEC-2000 bad
matching? 20.1 19.9 1 260 0.2 0.12 XS192 10-DEC-19
99 20.8 20.4 2 492 0.0 0.19 S192 20-SEP-2000 19.6
19.5 2 1485 0.1 0.14 XS372 6-FEB-2001 bad
matching? 18.1 17.8 1 137 0.0 0.17 S372 8-SEP-1999
21.1 20.9 9 206 0.1 0.15 S430 15-NOV-1999 No red
plate 20.6 20.5 1 914 0.1 0.17 S452 5-OCT-2000 No
red plate 16.9 16.7 3 155 0.3 0.13 XS468 11-DEC-19
99 No faint GSPC2 17.9 17.3 3 473 0.1 0.11 S468 21
-SEP-2000 No faint GSPC2 17.4 17.6 6 679 0.0 0.27
S522 1-DEC-1999 large error 20.1 20.1 1 981 0.1
0.16 ER633 2-FEB-2001 bad matching? 20.9 21.2 1 60
3 0.1 0.11 S633 29-NOV-2000 18.1 17.8 2 194 0.4 0.
19 ER703 6-FEB-2001 18.8 18.9 1 823 0.2 0.12 S703
28-NOV-2000 bad matching? 20.3 20.5 2 1417 0.1 0.1
5 ER774 12-FEB-2001 bad matching? 21.0 21.1 2 818
0.2 0.13 S774 4-JAN-2001 bad matching?
14Star completeness for 1606 pair of plates
15All object completeness for 1606 pair of plates
16J - F color
17J - F color
18J - F color
19J - F color
20J - F color
21GSC 2 color distribution as a galactic latitude
function
22Conclusions
- GSC 2.2.01 provide at least 1 calibrated star
(photometrical (J,F) and astrometrical) in a
2.5x2.5 minute squares. Dense enough for the
telescope operation - The number of fields that need photometric
recalibration are less than 5 - The major effort for the next release will be
improving the accuracy for the faint end,
providing an even product with a very good data
quality for astrophysical research - An effort still needs is in the pass band
characterization, specially oriented for the
final users (Observing tools, proposals planning,
etc.) .may be my homework -