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IA2-TNG Help PDF Print E-mail
Wednesday, 12 May 2004 12:54

General Instructions for IA2 - TNG Database Server

This form allows the user to download  FITS files or request a DVD or view the header or image preview or save the VOTable with the metadata of these files taken from the The Telescopio Nazionale Galileo (TNG).

To dawnload a tar multi-files you have to request a username and  password which must be insert when you try to save the file.

The following table shows the main TNG optical parameters.

M1 diameter 3.58m

Focal length

38.5m (f/11)

M2 diameter

0.875m

M2 baffle diam.

1.165m

Scale

5.36arcsec/mm

Vignetting-free field

25arcmin diameter

The main feature of the TNG is the presence of an Active Optics (AO) system to perform real-time, low frequency correction of the optical components in order to ensure the best optical performances in all conditions and to compensate for the deformations of the primary mirror (M1), which is too thin to be completely rigid. Measurements of the optical performances show that the 80% of the Encircled Energy is within 0.11" at a wavelength of 632nm. M2 are the secondary mirrors.

TNG is 3.58m Alt-Az telescope equipped with an active optics system. Its 2 Nasmyth foci host 4 instruments which are permanently mounted and operating. The table below summerize the proprieties of them:

InstrumentDevicesPropertiesScaleComments
OIG 2 x EEV 4280



SiTe
2048×4096 13.5µ


2048×2048 22µ
0.072"/pix, FOV=5'


0.117"/pix, FOV=4'




not yet available
LRS Loral 2048×2048 15µ 0.275"/pix, FOV=9.2'  
SARG 2 x EEV 4280 2048×4096 13.5µ 0.16"/pix  
NICS Rockwell HgCdTe 1024×1024 18.5µ 0.25"/pix, FOV= 4.2'
0.13"/pix, FOV= 2.2'
 

Because of the altazimuth mount TNG cannot track objects within a "dead" zone around the zenith which has a radius of about one degree. For security reasons, observations are only performed at elevations larger than 14 degrees and when the sun is below the horizon. For security reasons, observations are only performed at elevations larger than 14 degrees and when the sun is below the horizon. The TNG is producing images of the sky north of declination -64 deg.

Descriptions of individual fields on this form follow:

Filename

This string gives the original name of the FITS file taken by TNG Telescope, it is unique. The research on  this field is LIKE type.

Central Right Ascension

The desired position on the sky is expressed in terms of its celestial position which consists of a Right Ascension (like longitude but expressed in hours) and declination (like latitude). The central Right Ascension at the specified equinox is given as hh mm ss.ss  or hh:mm:ss.ss (hours minutes and seconds of time). Values in the range 0 to 24 are valid.

Central declination

The central declination is given as +/-dd mm ss.ss or +/-dd:mm:ss.ss (degrees, minutes and seconds of arc). Values in the range -64:38:53.94 (the southern limit of the survey) to +00:00:60 are valid.

Radius

The radius from the central RA e DEC where the search is done, it's given in arcsec.

Equinox

The equinox of the coordinates used for input coordinates is J2000. The resulting FITS file will use this equinox for coordinates.

Instrument

Sarg
SARG is a high efficiency spectrograph designed for the spectral range from 370 up to 900 nm, and for resolution from R=29,000 up to R=164,000. SARG uses an R4 echelle grating in Quasi-Littrow mode; the beam size is 100 mm giving an RS product of RS=46,000 at order centre. Both single object and long slit (up to 30 arcsec) observing modes are possible. A dioptric camera images the cross dispersed spectra onto a mosaic of two 2048X4096 CCDs.
Nics
NICS (Near Infrared Camera Spectrometer) is the TNG infrared (0.9-2.5 µm) multimode instrument which is based on a HgCdTe Hawaii 1024x1024 array. Its observing capabilities include imaging (4.2' x 4.2' f.o.v.), high-throughput low resolution spectroscopy (RS=50-500), medium resolution spectoscopy (max-R=2500), imaging polarimetry, spectropolarimetry and, when coupled to the adaptive optics module, nearly diffraction limited imaging.
 Dolores-LRS
DOLORES (s a focal reducer instrument installed at the Nasmyth B focus of the TNG. The detector is a Loral thinned and back-illuminated 2048x2048 CCD. The scale is 0.275 arcsec/px which yields a field of view of about 9.4 x 9.4 arcmin. The instrument allows imaging through broad and narrow band filters as well as spectroscopic observations with resolving powers between RS=300 and RS=3000. A multi-slit mode, based on custom masks manufactured by a dedicate cutting machine, is also available. Please note that MOS programs are bound to strict contraints on the number of masks and on the time necessary to design and manufacture them. In particular, each program can request up to a maximum of 5 masks per night and 10 masks per observing run.
Oig
OIG is a CCD camera for direct imaging at optical wavelengths (between 0.32 nd 1.1 microns) for the TNG. It is mounted on the Nasmyth A Adapter interface. OIG is designed to host a variety of CCD chips or mosaics for a field of view up to 10 arcmin. At the moment it is equipped with a mosaic of two thinned and back-illuminated EEV 42-80 CCDs with 2048 x 4096 pixels each (pixel size of 13.5 microns). The resulting pixel scale is 0.072 arcsec/pix for a total field of view of about 4.9 x 4.9 arcmin.

Date Observation

This date gives when the FITS file was written,  is given as YYYY-MM-DD (YEAR from 2000 to 2005, MONTH from 01 to 12 and DAY from 01 to 31), you can search file after 2000-01-31.

Time observation

This time gives when the exposure start and FITS file was written, is given as hh:mm:ss (hours, minutes and seconds of time).

Observer

This string is the observer's name.

Object

This string is the name of object, if provided is given by the observer.

Exptime

This is the Esposition Time in seconds. 

 

Observation Type

This string is the observation type, it could be:

OBSERVATION TYPE

BIAS

FLAT-SKY SCIENCE
CALIB LAMP TEST
DARK NOT-SET ZERO
FLAT OBJECT  

Grism

This string is the Grism Type.

NICS dispersers LRS dispersers
 Low resolution  Medium resolution

LR-B Grm1

Amici 1mic LR-R Grm3(1)
IJ Js MR-I Grm4 (2)
JH J HR-B Grm5
JK' H HR-V Grm6
HK KB HR-R Grm7
    HR-I Grm8
    VPH Grm9

 

Slit

This string is the Slit Type.

NICS Slits
0.5
0.75
1.0
1.5
2.0
Long slit spectroscopic observations are performed by inserting a slit at the entrance focal plane and a disperser (grism or prism) in the collimated beam. The table here lists the slits available in NICS which, thanks to the refurbishment works of Feb-Mar 2003, have now a very stable and repeatable positioning. All spectroscopic modes make use of the LF camera with a scale of 0.25"/pixel.

The LRS has the MOS slit.

Filter

This string is the Filter Type. How you can see from the table below there is a problem in the filter naming the we're trying to solve.

                                                        FILTER NAME

 

 

 

 

ALMU 660.7/2.0

G_OAB_14

I_SDSS_32

SW

ALMU 661.8/2.0

G_OAB_15

I'_07

TIO

ALMU 666.1/2.0

GREEN (KG4)

J

TIO_27

AMT2

G-SDSS-30

JS

U JOHNSO

AMT5

G_SDSS_30

K

U JOHNSON

B JOHNSO

H

KCONT

U-JOHNOIG

B JOHNSON

HALFA 6563/65

KPRIM

U_JOHNSON

B_JOHNSON

HALFA 6575/61

NEED INIT

UJOHNSON

BJOHNSON

H-ALFA22

[NII] 6583/30

U-JOHN-01

B-JOHN-10

HALPHA

[NII] 6588/32

U_JOHN_01

B_JOHN_10

H_ALPHA_22

NII_23

U-JOH-OIG

BLUE (BG40)

HALPHA_22

NONE

U-SDSS-29

BRG

HA_22

[OIII] 5007/50

U_SDSS_29

CARLETTO

HA_24

OII_17

U12732/W/30

CD BLUE

HBETA 4861/65

OPEN

V JOHNSO

CD RED

HBETA 4862/57

R GUNN

V JOHNSON

CDBLUE

HBETA_19

R JOHNSON

V_JOHNSON

CD-RED

HB_19

RED (OG570)

VJOHNSON

CDRED

HCONT

R-GUNN

V-JOHN-11

CH4L

H2

RGUNN

V_JOHN_11

CH4S

I GUNN

R-GUNN-N6

YEL (GG455)

CLEAR

I JOHNSON

R-GUNN-06

YELL(GG455)

CN

I-GUNN

R_GUNN_15

YELLOW (GG455)

CN-#28

I-GUNN-07

R_JOHNSON

Z GUNN

CN_28

I_GUNN_07

RJOHNSON

Z_GUNN

CUT19

I-GUNN-7

R-JOHN-12

ZGUNN

DARK

I-JOHNSON

R_JOHN_12

Z-GUNN-16

FEII

I_JOHNSON

R_OAB_15

Z_GUNN_16

FREE(FLAT)

IJOHNSON

R_SDSS_29

Z_OAB_16

G GUNN

I-JOHN-13

R-SDSS-31

Z_SDSS_31

G-GUNN

I_JOHN_13

R_SDSS_31

Z-SDSS-33

GGUNN

I_OAB_07

[SII] 6724/65

Z_SDSS_33

G-GUNN-05

I_OAB_7

SII_R_26

1MIC

G-GUNN-14

I_SDSS_30

SII_25

6 EMPTY

G_GUNN_14

I-SDSS-32

SLIT

 

TNG offers a wide set of wide and narrow band filters for imaging purposes that can be used both on OIG and DOLORES. Both instruments are normally equipped with the standard broad-band set. In the link below please find plots and tables summarizing the main filter parameters:

http://www.tng.iac.es/instruments/filters/

Lamp

This string is the Lamp Type, it could be:

LAMP TYPE

ALON_1

CD2 NEON_1
ALON_2 CD3-CD4 PARKING
ARGON CDALL TH LAMP
CD1 HELIUM_1 CDALL
PARKING

 

Detector

This string is the Detector,  it could be:

DETECTOR TYPE

EEV4280

OIG
LORAL SRG
LRS  

For any problem please contact: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Last Updated on Wednesday, 07 July 2010 10:21
 

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