Instrumentation for the La Silla Observatory At the ESO La Silla site is a direct imaging facility (DIFA) at the A Nasmyth focus of the NTT, in front of the image derotator which feeds the IRSPEC infrared spectrograph. Two remotely-controlled 45-degree mirrors can be inserted in the light beam to deviate the telescope beam either to a CCD camera (SUSI) or to an infrared array. In the configuration which has been implemented, SUSI is equipped with a Tektronix 1024**2 CCD with high quantum efficiency from the UV to the near infrared. The CCD pixel size corresponds to 0.13 arcsec in the focal plane of the NTT. A filter wheel and a shutter are located in front of the CCD. The following table was provided with filter specifications (and is reproduced as SUSIINDX in the INDEX directory): SuSI Observation Log File # | Date | UT | Filter | Tau exp/s | Airmass ----------------------------------------------------------------------- part0131| 1994-07-23 | 23:49:24 | CH4 | 10.09 | 1.0760 part0133| 1994-07-23 | 23:55:23 | 6822 A cont | 0.26 | 1.0827 part0134| 1994-07-23 | 23:57:51 | H alpha | 1.09 | 1.0858 part0135| 1994-07-24 | 00:00:40 | H alpha | 0.56 | 1.0894 part0136| 1994-07-24 | 00:03:08 | H alpha cont | 0.56 | 1.0928 part0137| 1994-07-24 | 00:06:13 | CO+ 4247 A | 1.08 | 1.0971 part0138| 1994-07-24 | 00:09:14 | CN 3877 A | 1.09 | 1.1015 part0139| 1994-07-24 | 00:11:45 | CN 3877 A | 1.09 | 1.1054 part0140| 1994-07-24 | 00:14:57 | CN 3877 A | 20.09 | 1.1108 part0141| 1994-07-24 | 00:18:28 | 5210 A cont | 0.25 | 1.1164 part0154| 1994-07-24 | 02:37:16 | CH4 | 10.09 | 1.7411 part0155| 1994-07-24 | 02:40:09 | 6822 A cont | 0.25 | 1.7680 part0156| 1994-07-24 | 02:42:38 | H alpha | 0.56 | 1.7927 part0157| 1994-07-24 | 02:45:07 | H alpha cont | 0.56 | 1.8181 part0158| 1994-07-24 | 02:47:49 | 5210 A cont | 0.25 | 1.8470 part0159| 1994-07-24 | 02:50:27 | CO+ 4247 A | 1.08 | 1.8763 part0160| 1994-07-24 | 02:53:09 | CN 3877 A | 20.09 | 1.9091 part0170| 1994-07-24 | 03:23:03 | CH4 | 10.09 | 2.3571 part0171| 1994-07-24 | 03:25:53 | 6822 A cont | 0.25 | 2.4107 part0172| 1994-07-24 | 03:28:49 | 5210 A cont | 0.25 | 2.4712 part0173| 1994-07-24 | 03:31:26 | CO+ 4247 A | 1.08 | 2.5281 ----------------------------------------------------------------------- CH4: "private" filter, kindly provided by S. Mottola, DLR, Berlin, Germany Lambda cen. = 8900A, delta Lambda = 100A 6822 A: continuum filter, ESO#441, Lambda cen. = 6822A, delta Lambda = 73A H alpha: H alpha continuum, ESO#696, Lambda cen. = 6654A, delta Lambda = 61A cont H alpha: H alpha filter, ESO#692, Lambda cen. = 6552A, delta Lambda = 60A 5210 A: continuum filter, ESO#432, Lambda cen. = 5210A, delta Lambda = 60A CO+: CO+ filter, ESO#573, Lambda cen. = 4247A, delta Lambda = 77A CN: CN filter, ESO#676, Lambda cen. = 3877A, delta Lambda = 19A