Hokupa'a PSF Library

Introduction

This page provides access to a library of Hokupaa/QUIRC PSFs for use in observation planning and to aid in data reductions. The data were taken from the 2000 QuickStart and the 2001A Classical observing semesters.

Notes

Images were sky-subtracted, flat-fielded, and coadded into effective integration times of generally greater than 60 seconds. The final mosaic-ed images were then cropped to 256 x 256 pixels (5" x 5") and scaled to a unit peak intensity.
The seeing is not calculated by Hokupaa nor is there a site seeing monitor so there is no record of the seeing for any particular observation.
The images are focal-plane images taken from Gemini/Hokupaa/QUIRC data as as such may contain residual detector defects, instrument aberrations, etc.
The table lists the number of counts in the wavefront sensor in (kcnts/sec). This number corresponds to the photon flux from the entire aperture. To calculate an approximate R-band magnitude, use the following:

wfs photon cnts = efficiency * Area * bandpass * 730 * 10 ^-R/2.5

⁵

Header Keywords

Each FITS header contains only the basic Hokupa'a/QUIRC header information. Note that the EXPOSURE keyword signifies the total exposure in the co-added image but that the image has been scaled to have unit peak intensity. Four new keywords: WFSCNTS, AOGSDIST, AOGSPA, and AOGSREF give the counts in the wavefront sensor, the distance of the PSF star from the AO guide star, the position angle (degrees East of North) to the AO guide star, and a reference to the companion on-axis PSF star in the case that the file contains an off-axis PSF star. The WFSCNTS indicate the number of counts from the source (and not the sky) in the Hokupa'a wavefront sensor in units of kcnts/sec when the system is open-loop. A nominal background of 6kcnts/sec for the sky has been subtracted when observation logs do not specify if the logged counts are sky subtracted. The throughput to the Hokupa'a wavefront sensor is given in the Hokupa'a Basics page.

J-Band PSFs

AOGS Counts (kcnts/s)	AOGS distance	AOGS Position Angle	Approx.Strehl	FWHM	Exposure Time	File	On-axis PSF Reference File
114	0.00"	0.00	1%	0.26"	300.0	PSF_J_003.fits	-
84	0.00"	0.00	<1%	0.41"	480.0	PSF_J_001.fits	-
84	11.5"	104	<1%	0.41"	480.0	PSF_J_002.fits	PSF_J_001.fits
17	0.00"	0.00	1%	0.22"	300.0	PSF_J_004.fits	-

H-Band PSFs

AOGS Counts (kcnts/s)	AOGS distance	AOGS Position Angle	Approx.Strehl	FWHM	Exposure Time	File	On-axis PSF Reference File
400	0.00	0.00	3%	0.16"	330.0	PSF_H_012.fits	-
350	0.00	0.00	1%	0.19"	135.0	PSF_H_002.fits	-
350	12.5	51.35	1%	0.23"	135.0	PSF_H_003.fits	PSF_H_002.fits
124	0.00	0.00	3%	0.14"	300.0	PSF_H_016.fits	-
104	0.00	0.00	3%	0.16"	50.0	PSF_H_013.fits	-
104	0.00	0.00	3%	0.17"	180.0	PSF_H_014.fits	-
94	0.00	0.00	2%	0.17"	300.0	PSF_H_001.fits	-
82	0.00	0.00	1%	0.30"	180.0	PSF_H_006.fits	-
82	7.4	-96.24	1%	0.27"	180.0	PSF_H_007.fits	PSF_H_006.fits
64	0.00	0.00	6%	0.12"	7.20	PSF_H_015.fits	-
54	0.00	0.00	1%	0.33"	480.0	PSF_H_008.fits	-
52	0.00	0.00	<1%	0.58"	480.0	PSF_H_009.fits	-
44	0.00	0.00	1%	0.31"	150.0	PSF_H_010.fits	-
44	7.6	71.97	1%	0.31"	150.0	PSF_H_011.fits	PSF_H_010.fits
34	0.00	0.00	1%	0.26"	300.0	PSF_H_004.fits	-
34	7.6	71.95	1%	0.28"	300.0	PSF_H_005.fits	PSF_H_004.fits

Kp-Band PSFs

AOGS Counts (kcnts/s)	AOGS distance	AOGS Position Angle	Approx.Strehl	FWHM	Exposure Time	File	On-axis PSF Reference File
580	0.00	0.00	9%	0.12"	155.0	PSF_Kp_013.fits	-
580	12.6	51.35	7%	0.13"	155.0	PSF_Kp_014.fits	PSF_Kp_013.fits
400	0.00	0.00	1%	0.30"	300.0	PSF_Kp_017.fits	-
290	0.00	0.00	4%	0.19"	150.0	PSF_Kp_001.fits	-
290	11.1	-155.8	2%	0.20"	150.0	PSF_Kp_002.fits	PSF_Kp_001.fits
240	0.00	0.00	2%	0.24"	870.0	PSF_Kp_015.fits	-
240	12.6	134.5	2%	0.27"	870.0	PSF_Kp_016.fits	PSF_Kp_015.fits
230	0.00	0.00	7%	0.14"	300.0	PSF_Kp_018.fits	-
180	0.00	0.00	2%	0.27"	300.0	PSF_Kp_019.fits	-
114	0.00	0.00	5%	0.20"	300.0	PSF_Kp_009.fits	-
104	0.00	0.00	9%	0.15"	240.0	PSF_Kp_020.fits	-
104	0.00	0.00	14%	0.11"	360.0	PSF_Kp_021.fits	-
84	0.00	0.00	1%	0.38"	240.0	PSF_Kp_003.fits	-
84	11.5	103.8	1%	0.34"	240.0	PSF_Kp_004.fits	PSF__Kp_003.fits
84	0.00	0.00	4%	0.20"	840.0	PSF_Kp_005.fits	-
36	0.00	0.00	3%	0.26"	420.0	PSF_Kp_006.fits	-
36	7.02	-118.2	3%	0.27"	420.0	PSF_Kp_007.fits	PSF_Kp_006.fits
36	10.5	-15.9	3%	0.26"	420.0	PSF_Kp_008.fits	PSF_Kp_006.fits
26	0.00	0.00	8%	0.15"	480.0	PSF_Kp_010.fits	-
25	0.00	0.00	9%	0.16"	300.0	PSF_Kp_011.fits	-
17	0.00	0.00	6%	0.18"	300.0	PSF_Kp_012.fits	-

Created 25 January 2001; Mark Chun
Modified 30 July 2001; Mark Chun