NIRI SV observation 19

	Status: observations complete Data link: Public data page Assessment: complete.

Mode:	Wide-field Imaging
Additional instrument verification:	Test NIRI wide-field imaging mode in simplest configuration possible (low background, one filter, no offset sky fields, compact objects)
Telescope verification:	Tests preliminary version of telescope offset sequencer. Check of vignetting by P2 probe arm.
Proposed observing sequence:	Telescope offset sequence files created manually
OT program file:	available
Science background:	J-band photometry of a fading type-Ia supernovae at a redshift near z=1. Supernovae at this redshift are crucial to the efforts to measure the acceleration of the universe due to the cosmological constant. This SV program was a combination of two programs taken from the aborted NIRI 2001A queue (Perlmutter, US, and Hook, UK). They were the top ranked proposals in the queue. They also represented the simplest type of observation in the fisrt NIRI observing mode to be commissioned.
Target(s):
	Object	RA (2000)	dec (2000)
	Type Ia supernova "Satie"	13 57 11.95	4 20 27.07
Observing conditions:	image quality: 50%-ile (0.5 to 0.6 arcsec at J) sky transparency (clouds): 50%-ile (photometric) sky transparency (water vapour): Any sky background: 80%-ile max air mass: 1.6
Observing time achieved:	30,000 sec = 8.3 hr on-source.
Data release date:	October 11, 2001
SV team member(s) responsible for assessment:	Isobel Hook, Saul Perlmutter, and Joe Jensen

Last update August 20, 2001; Joe Jensen