B/subaru Log of Subaru Prime Focus Camera Exposures (ADAC NAOJ, 2007)
Log of Subaru Prime Focus Camera (Suprime-Cam) Exposures
<Astronomical Data Analysis Center,
National Astronomical Observatory of Japan (2007)>
ADC_Keywords: Observatory log ;
Description:
This database contains a log of the Subaru Prime Focus Camera
(Suprime-Cam) exposures since April 2001. The data are regularly
updated, and the last date of the log is written in "File Summary".
Note that from this version of Nov. 2005, the data number is largely
increased because those data with worse position determination
(up to 30 arcsec error) are included.
Suprime-Cam is an 80-mega pixels (10240 x 8192) mosaic CCD camera, for
the wide-field prime focus of the 8.2m Subaru telescope. Suprime-Cam
covers a field of view 34'x27', a unique facility among the 8-10m
class telescopes, with a resolution of 0".202 per pixel. The focal
plane consists of ten high- resistivity 2kx2k CCDs developed by MIT
Lincoln Laboratory, which are cooled by a large Stirling-cycle cooler.
The CCD readout electronics was designed to be scalable, which allows
the multiple read-out of tens of CCDs. It takes 50 seconds to readout
entire arrays. A filter-exchange mechanism of the jukebox type is
designed that can hold up to ten large filters (205x170x15mm3).
The wide-field corrector is basically a three-lens Wynne- type, but
has a new type of atmospheric dispersion corrector. The corrector
provides a flat focal plane and an un-vignetted field of view of 30'
in diameter. The achieved co-planarity of the focal array mosaic is
smaller than 30um peak-to-peak, which realizes mostly the seeing
limited image over the entire field. The median seeing in the
I_c-band, measured over one year and a half, is 0".61. The PSF
anisotropy in Suprime-Cam images, estimated by stellar ellipticities,
is about 2% under this median seeing condition. At the time of
commissioning, Suprime-Cam had the largest survey speed, which is
defined as the field of view multiplied by the primary mirror area of
the telescope, among those cameras built for sub-arcsecond imaging.
For details, see: Miyazaki et al., Publ. Astron. Soc. Japan 54,
833-853, 2002 (2002PASJ...54..833M 2002PASJ...54..833M)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
suprimc.dat 133 282397 The Suprime-Cam Observation Log (2005-11-02)
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See also:
http://subarutelescope.org/Observing/Instruments/SCam/ :
Sprime-Cam home page
http://smoka.nao.ac.jp/ :
Subaru data archives, home page
Byte-by-byte Description of file: suprimc.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- FrameID ! Frame ID (1)
14- 21 F8.4 deg RAdeg Right Ascension (J2000) of the CCD chip
center
23- 30 F8.4 deg DEdeg Declination (J2000) of the CCD chip center
32- 35 I4 yr ObsStart.Y Observation start date (year, UT)
36 A1 --- --- [-]
37- 38 I2 "month" ObsStart.M Observation start date (month, UT)
39 A1 --- --- [-]
40- 41 I2 d ObsStart.D Observation start date (day, UT)
43- 44 I2 h ObsStart.h Exposure start time (hour, UT)
45 A1 --- --- [:]
46- 47 I2 min ObsStart.m Exposure start time (minute, UT)
48 A1 --- --- [:]
49- 50 I2 s ObsStart.s Exposure start time (second, UT)
52- 57 F6.1 s ExpTime Exposure time
59- 64 A6 --- ObsType Observation type (BIAS, FLAT, OBJECT, etc.)
* those data other than OBJECT are omitted.
66- 95 A30 --- Object Object name
97-104 A8 --- Filter Filter combination (2)
106-110 F5.3 --- AirMass Value of the airmass at the beginning of
the exposure
112-115 I4 pix NAXIS1 Dimension of the image (X-axis)
117-120 I4 pix NAXIS2 Dimension of the image (Y-axis)
122 A1 --- FF [01] Flat-fielding processing flag (3)
124-127 F4.2 arcsec Seeing Seeing size
129-133 F5.3 --- Ellip The PSF anisotropy estimated by stellar
ellipticities
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Note (1): Unique identifier for an observational data.
The last digit denotes CCD chip number. For CCD chip number,
see: http://subarutelescope.org/Observing/Instruments/SCam/ccd.html
Note (2): Filter names written on FITS headers. For a detailed description
see: http://smoka.nao.ac.jp/filter.jsp
Note (3): '1'= flat-field processed data are provided in SMOKA,
'0'= they are not provided.
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(End) Fumiaki Nakata, Koichi Nakajima [ADAC, NAOJ] 25-Aug-2007