Atacama Pathfinder EXperiment APEX
Observing time calculator
MPIfR Bonn   ESO   Onsala Space Observatory
  APEX TWIKI CONTACT SEARCH HELP NEWS DISCLAIMER

Home > Instrumentation > Heterodyne Instruments > Observing time calculator > Calculator ON/OFF Integration Time Estimator

ON/OFF Integration time estimator V 6.0.5
Use this calculator for on-off observations. If you are planning on-the-fly mapping, you should instead use the dedicated OTF Calculator

The (average) elevation of the source, the receiver temperature, required σ (in K), and the spectral resolution, the on-source integration time can be estimated.

System overheads include telescope movements, software overheads, observing mode efficiency, etc. Setup + calibration overheads include source acquisition, pointing, focus, receiver tuning and calibration scans. Note about overheads.

For an overview of the atmospheric transmission and the possible backend configurations for each receiver, check our atmospheric transmission tool.
Heterodyne receiver:
Tuning Freq: [GHz]
Line Freq [±2 GHz from tuning]: [GHz]
Side Band:
Full resolution Δv [ channels] : [km/s]
Manual resolution Δv: [km/s]
pwv : [mm H2O]
Source elevation: [deg]
rms : [K]
Results
Tau (source elev deg) 16828.081
Trec [K] 80.5
Tsys [K] (source elev deg) INF
TsysImage [K] (source elev deg) 80.5
Beam [arcsec] 18.1
Position Switching On time 0.000 [s]
Total Position Switching time 0.000 [s]
Beam Switching On time 0.000 [s]
Total Beam Switching time 0.000 [s]

Recent changes:


DateVersionInformation
2018-09-106.0.5No changes in computation. Updated FE names (SEPIA180, SEPIA660. Added table with tuning ranges per FE. Added warning messages when user inputs incorrect setups
2018-08-316.0.4Includes updates for 2SB SEPIA-B9 after installation and commissioning: Trx curves, sideband rejection and extended tuning range [583-724 GHz]
2018-07-026.0.3Updates with new SEPIA-B9 setup, new tunning range and change from DSB to 2SB
2018-03-216.0.2LASMA receiver added
2017-09-066.0.1New version 6.0.1, Fix a bug in off time estimation for integration time calculator V6.0
2017-08-306.0New version 6.0 available. New set of overhead parameters per instrument, measured from data obtained in 2016.
SEPIA-B7 added, The specification values for SEPIA-B7 are estimates and will need to be updated after successful installation and commissioning









Instrument Frequency Range:


Instrument Frequency Range [GHz]
FLASH345
262.0 - 374.0
FLASH460
374.0 - 516.0
CHAMP690
620.0 - 720.0
CHAMP810
780.0 - 950.0
SEPIA180
159.0 - 211.0
SEPIA660
578.0 - 738.0
PI230
200.0 - 270.0
SEPIA345
272.0 - 376.0
LASMA
262.0 - 374.0