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FORS Standard Fields and Stars

The lists of available calibration fields and stars are given here for various FORS setups, i.e. for Stetson Fields for standard filters, Landolt Fields for other broadband filters, Spectroscopy, empty Fields for Twilight Flats and Polarimetry. The name of the Observation Blocks already prepared by PSO and available for any visiting observer is given, as well as some information on the field or star.

Photometric Standard Stars: Stetson Fields

Template name
Star field
Center coordinates Ra, Dec
Photom-std-NGC121
NGC121
00:28:07.8, -71:13:03.3
Photom-std-T_Phe
T_Phe
00:30:12.1, -46:29:08.7
Photom-std-L92
L92
00:55:09.7, +00:42:49.9
Photom-std-PG0231
PG0231
02:33:40.9, +05:19:15.0
Photom-std-L95
L95
03:53:38.7, +00:07:16.7
Photom-std-E2
E2
04:02:40.0, -44:46:27.22
Photom-std-E3
E3
06:43:13.6, -45:13:28.8
Photom-std-NGC2298
NGC2298
06:48:37.2, -35:58:34.6
Photom-std-L98
L98
06:52:09.3, -00:19:00.31
Photom-std-Ru149
Ru149
07:24:16.8, -00:32:20.1
Photom-std-Ru152
Ru152
07:29:56.5, -02:05:42.13
Photom-std-NGC2420
NGC2420
07:38:28.3, +21:34:02.9
Photom-std-NGC2437
NGC2437
07:41:41.0, -14:50:45.8
Photom-std-NGC2682
NGC2682
08:51:26.2, +11:48:57.3
Photom-std-NGC2818
NGC2818
09:16:23.0, -36:35:20.3
Photom-std-PG0918
PG0918
09:21:37.1, +02:27:16.7
Photom-std-E4
E4
09:23:42.5, -45:24:43.0
Photom-std-L101
L101
09:56:53.0, -00:19:53.7
Photom-std-LeoI
LeoI
10:08:55.1, +12:22:37.6
Photom-std-PG1047
PG1047
10:50:05.3, -00:00:57.4
Photom-std-Pal4
Pal4
11:29:15.5, +28:58:12.4
Photom-std-E5
E5
12:05:13.3, -45:33:56.5
Photom-std-L104
L104
12:42:17.2, -00:31:51.6
Photom-std-PG1323
PG1323
13:25:45.0, -08:49:59.3
Photom-std-PG1525
PG1525
15:28:11.0, -07:14:34.2
Photom-std-L107
L107
15:39:39.6, -00:14:13.8
Photom-std-PG1633
PG1633
16:35:12.1, +09:50:59.0
Photom-std-PG1657
PG1657
16:59:35.5, +07:32:31.0
Photom-std-E7
E7
17:27:20.1, -45:02:28.1
Photom-std-L110
L110
18:42:50.1, +00:08:04.9
Photom-std-NGC6940
NGC6940
20:34:32.0, +28:15:10.0
Photom-std-L112
L112
20:42:27.7, +00:08:46.8
Photom-std-MarkA
MarkA
20:43:59.0, -10:47:01.0
Photom-std-NGC7006
NGC7006
21:01:11.5, +16:12:26.7
Photom-std-PG2213
PG2213
22:16:19.1, -00:21:14.1
Notes: (1) Reference: Stetson, P.B., 2000, Homogeneous Photometry for Star Clusters and Resolved Galaxies. II. Photometric Standard Stars (2000PASP..112..925S), (2) The links provide Postscript charts of the areas with SR and HR fields indicated, (3) Coordinates are J2000.

Photometric Standard Stars: Landolt Fields

Template name
Star field
Center coordinates Ra, Dec
Photom-std-SA92
SA92-249
00:54:35.5, +00:40:19.5
Photom-std-PG0231+051
PG0231+051
02:33:39.8, +05:18:37.7
Photom-std-SA95
SA95-105
03:53:20.0, +00:00:57.8
Photom-std-SA98
SA98-670
06:52:14.4, -00:19:49.9
Photom-std-Rubin149
Rubin149
07:24:15.3, -00:32:20.9
Photom-std-Rubin152
Rubin152
07:29:58.1, -02:05:45.5
Photom-std-SA100
SA100-269
08:53:16.1, -00:42:19.3
Photom-std-PG0942-029
PG0942-029
09:45:12.1, -03:08:03.2
Photom-std-SA101
SA101-429
09:57:35.9, -00:18:50.3
Photom-std-PG1047+003
PG1047+003
10:50:08.5, -00:01:04.3
Photom-std-PG1323
PG1323-086
13:25:52.5, -08:49:56.6
Photom-std-PG1528+062
PG1528+062
15:30:44.7, +06:01:04.8
Photom-std-PG1633+099
PG1633+099
16:35:36.0, +09:46:33.4
Photom-std-PG1657+078
PG1657+078
16:59:32.4, +07:42:52.0
Photom-std-SA109
SA109-949
17:44:15.0, -00:02:17.0
Photom-std-SA110
SA110-362
18:42:52.4, +00:06:28.1
Photom-std-SA111
SA111-2088
19:38:22.0, +00:31:01.0
Photom-std-MarkA
MarkA
20:43:59.5, -10:46:32.8
Photom-std-SA113
SA113-239
21:41:09.5, +00:23:00.0
Photom-std-PG2213-006
PG2213-006
22:16:23.2, -00:21:40.8
Photom-std-PG2331+055
PG2331+055
23:33:47.9, +05:46:16.8
Notes: (1) Reference: Bessel et al. 1979, UBVRI Photometry (1979PASP...91..589B) and Landolt 1992, (2) The links provide Postscript charts of the areas with SR and HR fields indicated, (3) Coordinates are J2000.

Spectroscopic Standard Stars - and Imaging Standards for Gunn & interference filters

Template name
Star name
Coordinates Ra, Dec
specphot-std-G158-100
G158-100
00:33:54.32, -12:07:57.1
specphot-std-LTT377
LTT377
00:41:46.82, -33:39:08.2
specphot-std-BPM16274
BPM16274(*)
00:50:03.18, -52:08:17.4
specphot-std-LTT1020
LTT1020
01:54:49.68, -27:28:29.7
specphot-std-EG21
EG21
03:10:30.98, -68:36:02.2
specphot-std-LTT1788
LTT1788
03:48:22.17, -39:08:33.6
specphot-std-GD50
GD50
03:48:50.06, -00:58:30.4
specphot-std-SA95-42
SA95-42
03:53:43.68, -00:04:33.0
specphot-std-HZ4
HZ4
03:55:21.70, +09:47:18.7
specphot-std-LB227
LB227
04:09:28.76, +17:07:54.4
specphot-std-HZ2
HZ2
04:12:43.51, +11:51:50.4
specphot-std-GD71
GD71
05:52:27.51, +15:53:16.6
specphot-std-LTT2415
LTT2415
05:56:24.30, -27:51:28.8
specphot-std-HD49798
HD49798(*)
06:48:04.64, -44:18:59.3
specphot-std-LTT3218
LTT3218
08:41:34.10, -32:57:00.1
specphot-std-GD108
GD108
10:00:47.33, -07:33:31.2
specphot-std-LTT3864
LTT3864
10:32:13.90, -35:37:42.4
specphot-std-LTT4364
LTT4364
11:45:37.70, -64:50:25.1
specphot-std-Feige56
Feige56
12:06:39.7, +11:40:39.0
specphot-std-HZ21
HZ21
12:13:56.42, +32:56:30.8
specphot-std-Feige66
Feige66
12:37:23.55, +25:04:00.3
specphot-std-LTT4816
LTT4816
12:38:50.94, -49:47:58.8
specphot-std-Feige67
Feige67
12:41:51.83, +17:31:20.5
specphot-std-GD153
GD153
12:57:02.37, +22:01:56.0
specphot-std-G60-54
G60-54
13:00:09.53, +03:28:55.7
specphot-std-HZ43
HZ43
13:16:22.0, +29:05:57.0
specphot-std-HZ44
HZ44
13:23:35.37, +36:07:60.0
specphot-std-CD-32d9927
CD-32d9927
14:11:46.37, -33:03:14.3
specphot-std-LTT6248
LTT6248
15:39:00.0, -28:35:33.0
specphot-std-BD33d2642
BD33d2642
15:51:59.8, +32:56:54.8
specphot-std-EG274
EG274
16:23:33.75, -39:13:47.5
specphot-std-G138-31
G138-31
16:27:53.59, +09:12:24.5
specphot-std-LTT7379
LTT7379
18:36:26.29, -44:18:33.0
specphot-std-LTT7987
LTT7987
20:10:57.38, -30:13:01.2
specphot-std-G24-9
G24-9
20:13:56.05, +06:42:55.2
specphot-std-LDS749B
LDS749B
21:32:15.75, +00:15:13.6
specphot-std-BD28d4211
BD28d4211
21:51:11.07, +28:51:51.8
specphot-std-G93-48
G93-48
21:52:25.33, +02:23:24.3
specphot-std-BD25d4655
BD25d4655
21:59:42.02, +26:25:58.1
specphot-std-NGC7293
NGC7293
22:29:38.46, -20:50:13.3
specphot-std-LTT9239
LTT9239
22:52:40.88, -20:35:26.3
specphot-std-LTT9491
LTT9491
23:19:34.98, -17:05:29.8
specphot-std-Feige110
Feige110
23:19:58.39, -05:09:55.8
specphot-std-GD248
GD248
23:26:06.69, +16:00:21.4
Notes: (*) These stars only have model data above 3200Å, (1) The OB exist in MOS setup and in LSS, using the largest 2.5 arcsec slit -then the OB name contains "lss-" at the beginning, (2) The links provide detailed information on individual stars, (3) There is also a general description as well as an RA ordered list and an RA-Dec skymap for standards including the above listed, (4) Coordinates are J2000.

Empty Fields for Twilight Flats

Template name
Field name
Center coordinates Ra, Dec
twil-UBIVR-SR-0048  SGP  00:48:30.3, -28:03:01.0 
twil-UBIVR-SR-0102  0102-265  01:02:48.5, -26:34:25.0 
twil-UBIVR-SR-0247  0248-196  02:47:46.6, -19:46:11.1 
twil-UBIVR-SR-0427  0427-36  04:27:26.1, -36:25:16.0 
twil-UBIVR-SR-0909  9090-7  09:09:32.6, -07:38:26.0 
twil-UBIVR-SR-1004  CT1  10:04:27.0, -02:19:00.0 
twil-UBIVR-SR-1102  1101-264  11:02:23.5, -26:43:56.7 
twil-UBIVR-SR-1226  CT5  12:26:08.7, -06:38:29.0 
twil-UBIVR-SR-1254  CT2  12:54:58.7, -02:07:04.0 
twil-UBIVR-SR-1513  SER1  15:13:13.9, -00:31:47.5 
twil-UBIVR-SR-1539  SPKS 04  15:39:43.0, -33:56:54.0 
twil-UBIVR-SR-1649  SPKS 12  16:49:42.0, -15:21:00.0 
twil-UBIVR-SR-1731  SPKS 08  17:31:06.0, -25:44:24.0 
twil-UBIVR-SR-1802  SPKS 09  18:02:01.0, -04:32:36.0 
twil-UBIVR-SR-1900  SPKS 10  19:00:48.0, -37:21:18.0 
twil-UBIVR-SR-1919  SPKS 13  19:19:09.0, +12:22:05.0 
twil-UBIVR-SR-2126  SPKS 14  21:26:54.4, -08:51:41.0 
twil-UBIVR-SR-2334  2335-40  23:34:34.6, -39:49:04.0 
twil-UBIVR-SR-2345 2345+007  23:45:45.9, +00:40:40.0 
Notes: (1) Filters defined in the OB are UBIVR for the evening dusk. For the morning the OB are named ..-RVIBU-.. instead, (2) The links call 6.8'x6.8' images from the DSS1 database, (3) Coordinates are B1950.

Highly Polarized Standard Stars for Imaging Polarimetry (IPOL) OT QUEUE: Polar Std IPOL

OB name
Finding Chart
RA & DEC 2000
Comments
IPOL_NGC2024
NGC 2024
05:41:38 -01:54:37
none
IPOL_Vela1_95
Vela1 95
09:06:00 -47:19:00
none
IPOL_Hiltner652
Hiltner 652
17:43:20 -28:40:33
none
IPOL_HDE316232
HDE 316232
17:45:44 -29:13:18
none
IPOL_BD-14_4922
BD -14 4922
18:11:58 -14:56:08
none
IPOL_BD12_5133
BD -12 5133
18:40:02 -12:24:07
none
Readout mode: 200kHz,2x2,low. There are 4 exposures with the retarder waveplate at 0, 22.5, 45, and 67.5 deg.
Please check that the CCD is well exposed (> 10000 counts each exposure) but not saturated! You may need to adjust the exposure time.
Additional information on (some of) these stars are given on the FORS polarimetry page
Finding charts are obtained from 6.8' x 6.8' images from the DSS2 (red) database.

Highly Polarized Standard Stars for Spectropolarimetry (PMOS) OT QUEUE: Polar Std PMOS

OB name
Finding Chart
RA & DEC 2000
Comments
NGC 2024
NGC 2024
05:41:38 -01:54:37
none
PMOS_Vela1_95
Vela1 95
09:06:00 -47:19:00
none
PMOS_Hiltner652
Hiltner 652
17:43:20 -28:40:33
none
PMOS_HDE316232
HDE 316232
17:45:44 -29:13:18
none
PMOS_BD-14_4922
BD -14 4922
18:11:58 -14:56:08
none
PMOS_BD12_5133
BD -12 5133
18:40:02 -12:24:07
none
Readout mode: 100kHz,2x2,high There are 4 exposures with the retarder waveplate at 0, 22.5, 45, and 67.5 deg.
Please check that the CCD is well exposed (> 10000 counts each exposure) but not saturated! You may need to adjust the exposure time.
Additional information on (some of) these stars are given on the FORS polarimetry page
Finding charts are obtained from 6.8'x6.8' images from the DSS2 (red)as database.

Unpolarized Standard Stars for Imaging Polarimetry OT QUEUE: Polar Std IPOL

OB Name
Finding Chart
RA & DEC 2000
Comments
Zero_IPOL_WD2359-434
WD 2359-434
00:02:11 -43:09:55
White dwarf, plx=120 mas. The target is the brightest one. Only one guiding star in the field, with some vignetting. Non magnetic according to Koester et al. (1998)
Zero_IPOL_WD0310-688
WD 0310-688
03:10:31 -68:36:02
White dwarf (EG 21), plx=120 mas
Zero_IPOL_WD0752-676
WD0752-676
07:53:08 -67:47:33
White Dwarf, plx =?, high proper motion
Zero_IPOL_WD1344+106
WD 1344+106
13:47:24 +10:21:38
White Dwarf, plx =48, high proper motion, SE star of the binary
Zero_IPOL_WD1615-154
WD 1615-154
16:17:55 -15:35:51
White Dwarf, plx=60 mas, high proper motion
Zero_IPOL_WD1620-391
WD 1620-391
16:23:36 -39:13:22
White Dwarf, plx=78 mas, high proper motion star ~30 arcsecs SE of our coordinates?
Zero_IPOL_WD2039-202
WD 2039-202
20:42:35 -20:04:36
White Dwarf, plx=47 mas, high proper motion
Zero_IPOL_WD2149+021
WD 2149+021
21:52:23 +02:23:07
White Dwarf, plx=40 mas, high proper motion star ~1arcmin East or our coordinates?
CCD readout mode: 100kHz,2x2,high. There are 4 exposures with the retarder waveplate at 0, 22.5, 45, and 67.5 deg.
Please check that the CCD is well exposed (> 10000 counts each exposure) but not saturated! You may need to adjust the exposure time.
Finding charts are obtained from 6.8'x6.8' images from the DSS2 (red) database.

Unpolarized Standard Stars for Spectropolarimetry OT QUEUE: Polar Std PMOS

OB Name
Finding Chart
RA & DEC 2000
Comments
Zero_PMOS_HD10038
HD 10038
01:37:19 -40:10:38
 Bright Am, plx=6.4 mas, no need for finding charts; slit width=1.0 arcsec
Zero_PMOS_HD13588
HD 13588
02:11:17 -46:35:06
 Bright Am, plx=6.4 mas, no need for finding charts; slit width=1.0 arcsec
Zero_PMOS_HD42078
HD 42078
06:06:41 -42:17:56
Bright Am, plx=10.13, no need for finding charts; slit width=1.0 arcsec
Zero_PMOS_HD97689
HD 97689
11:13:51 -52:51:21
Bright Am, plx=12.13, no need for finding charts; slit width=1.0 arcsec
Zero_PMOS_WD1615-154
WD 1615-154
16:17:55 -15:35:51
White Dwarf, plx =?, high proper motion; see finding chart; slit width=2.5 arcsec
Zero_PMOS_WD1620-391
WD 1620-391
16:23:36 -39:13:22
White Dwarf, plx=78 mas, high proper motion; see finding chart; slit width=2.5 arcsec
Zero_PMOS_WD2039-202
WD 2039-202
20:42:35; -20:04:36
White Dwarf, plx=47 mas, high proper motion; see finding chart; slit width=2.5 arcsec
Zero_PMOS_WD2149+021
WD 2149+021
21:52:23; +02:23:07
White Dwarf, plx=40 mas, high proper motion; see finding chart; slit width=2.5 arcsec
CCD readout mode: 100kHz,2x2,high. We have 4 exposures with the retarder waveplate at 0, 22.5, 45, and 67.5 deg.
Please check that the CCD is well exposed (> 10000 counts each exposure) but not saturated! You may need to adjust the exposure time.
Finding charts are obtained from 6.8'x6.8' images from the DSS2 (red) database.