|
IRMS |
IRIS |
reference |
Effective Collecting Area of TMT [m2] |
630 |
630 |
Hexagon with 1.44m across the corner x 492 = 662 630 from IRIS SPIE(2010) |
Pixel Scale [arcmin/pix] |
0.06 (=60mas) |
0.004 (=4mas) for imaging 0.05 (=50mas) for spectroscopy |
TMT Instrumentation Handbook(2010) IRIS SPIE(2010) |
Strel Ratio |
|
0.7@J, 0.81@H, 0.89@K |
SR is not used for this calculation.
|
Diffraction Limit = Assumed Aperture(1) [arcsec] |
2.44&lambda/D 0.021"@J, 0.027"@H, 0.036"@K |
2&lambda/D 0.017"?@J, 0.023"@H, 0.030"@K |
IRIS SPIE(2010) |
A point source fall on... |
1x1 pix |
5x5 pix@J, 7x7 pix@H, 8x8 pix@K |
|
Assumed Encircled Energy inside Aperture(1) |
w/NFIRAOS wide-field mode for &Phi 120" 0.95@J, 0.95@H, 0.95@K |
w/NFIRAOS narrow-field mode for &Phi 30" 0.9@J, 0.9@H, 0.9@K |
TMT Instrument Handbook(2010) |
Thruput |
Telescope (a) |
0.91 (M1xM2xM3) |
0.91 (M1xM2xM3) |
TMT Instrument Handbook(2010) |
NIFIRAOS (b) |
0.85 |
0.85 |
TMT Insrtument Handbook(2010) |
OIWFS (c) |
|
0.986@J, 0.986@H, 0.988@K |
TMT Insrtument Handbook(2010) |
ADC (d) |
|
0.960@J, 0.960@H, 0.968@K |
TMT Insrtument Handbook(2010) |
Imager (e) |
0.45@J, 0.44@H, 0.33@K (Filters=0.9, QE=0.8) |
0.540@J, 0.62@H, 0.50@K |
MOSFIRE DDR(2007) TMT Instrument Handbook(2010) |
IMAGER TOTAL (a)x(b)x(c)x(d)x(e) |
0.348@J, 0.340@H, 0.255@K |
0.395@J, 0.454@H, 0.370@K |
|
Grating/Slicer (f) |
0.65@J, 0.75@H, 0.83@K |
0.410@J, 0.588@H, 0.529@K |
MOSFIRE DDR(2007) TMT Instrument Handbook(2010) |
SPECTROGRAPH TOTAL (a)x(b)x(c)x(d)x(f) |
0.2262@J, 0.255@H, 0.21@K |
0.300@J, 0.431@H, 0.40@K |
TMT Instrument Handbook(2010) |
Readout Noise |
5 e- (H2RG) |
5 e- (H4RG) |
MOSFIRE DDR(2007) IRIS SPIE(2010) |
Dark |
0.03 e-/s (H2RG) |
0.006 e-/s (H4RG) |
MOSFIRE DDR(2007) IRIS SPIE(2010) |
Assumed Background |
Sky brightness@MaunaKea J=16.1mag, H=13.8mag, K=14.8mag |
Thermal form Atmosohere: T=258K, &epsilon =0.1
Zodiacal light: T=5800K, &epsilon=3e-14
Thermal from Telescope: T=73K, &epsilon=0.02
Thermal from NFIRAOS+IRIS: T=243K, &epsilon=0.01 |
Gemini Homepage IRIS SPIE(2010) |
Exposure Time [sec] |
18000 (900s x 20) |
18000 (900s x 20) |
IRIS SPIE(2010) |
Spectral Resolution |
5000 |
4000 |
MOSFIRE DDR(2007) |