Index of /holdings/ear-c-igi-3-edr-borrelly-v1.0
Name Last modified Size Description
![[DIR]](/icons/back.gif)
Parent Directory -
![[DIR]](/icons/folder.gif)
calib/ 18-Jun-2004 19:22 -
catalog/ 18-Feb-2011 13:21 -
data/ 27-Sep-2005 11:57 -
document/ 27-Sep-2005 11:52 -
DOWNLOAD/ 18-Sep-2008 10:50 -
index/ 18-Sep-2008 10:49 -
![[TXT]](/icons/text.gif)
aareadme.txt 25-Jun-2007 11:29 5.5K
dataset.html 31-Aug-2011 12:13 2.5K
voldesc.cat 25-Jun-2007 11:25 3.1K [PDS catalog file]
PDS_VERSION_ID = PDS3
RECORD_TYPE = STREAM
OBJECT = TEXT
NOTE = "AAREADME file for Borrelly earth based images"
PUBLICATION_DATE = 2007-06-25
END_OBJECT = TEXT
END
*** NOTE: The Version 1 delivery volume of this data set was discovered
*** to contain corrupted FITS files in the data/ directory. This
*** was corrected and a second version of the delivery volume
*** created and submitted to PDS Engineering Node and the NSSDC
*** in July 2007.
This data set collection contains earth-based images of comet Borrelly.
The images included here were obtained at the McDonald Observatory on
five different observing runs during the 2001 apparition:
21-23 Sep 2001
12 Nov 2001
04-07 Dec 2001
07-08 Feb 2002
17-18 May 2002
The December data were obtained at the 2.1-m Otto Struve telescope and the
data from the other four runs were obtained at the 2.7-m Harlan J. Smith
telescope. In both cases, the Imaging Grism Instrument (IGI), a 5:1 focal
reducer and a TeK 1024x1024 CCD were used. On the 2.7-m telescope, this
configuration produces a vignetted field of view with 0.57 arcsec pixels. On
the 2.1-m the field of view is 6 arcmin, with 0.48 arcsec pixels.
On almost all nights, both broadband V and R filters were used. (On 7 Dec and
17 May, only R images were obtained.)
On photometric nights, Landolt standard stars were observed at several
airmasses to provide a measurement of the extinction and a means of obtaining
an absolute calibration.
There are four data directories. The first (BASIC) contains about 160 files
which are bias subtracted, flat fielded images of comet Borrelly from all of
the observing runs. The second (STANDARDS) contains about 100 images of
standard star fields that are used to calibrate the data. The third
directory (CALIBRATED) includes all of the calibrated images (images from
nights where standard stars were obtained). The calibrated images are a
subset of the images in the basic directory. The fourth directory
(PROCESSING) contains the bias frames and the flat field images that were
used to process the data. The filenames contain the date and filter
information for which they were used. All of the data files are in FITS
format.
An extensive discussion of the data can be found in Farnham, T.L. and
A.L. Cochran, 'A McDonald Observatory Study of Comet 19P/Borrelly: Placing
the Deep Space 1 Observations into a Broader Context', Icarus, 160, 398-418,
2002
This description was written by Tony L. Farnham
Questions regarding the scientific elements of the data set:
Tony Farnham
Small Bodies Node, Planetary Data System
Department of Astronomy, University of Maryland
College Park, MD 20742-2421
farnham@astro.umd.edu
Questions regarding PDS elements of the data set:
raugh@astro.umd.edu