ACS (Atmospheric Chemistry Suite)

ODE:Mars

Mission:ESA's ExoMars Trace Gas Orbiter

Instrument:ACS

PDS4 Bundle:urn:esa:psa:em16_tgo_acs

Search ExoMars Trace Gas Orbiter ACS data in Mars ODE:Product Search

The Atmospheric Chemistry Suite (ACS) instrument is an element of the Russian contribution to the ESA/Roscosmos ExoMars 2016 Trace Gas Orbiter (TGO) mission. The instrument hardware was built in the Space Research Institute of the Russian Academy of Sciences (IKI) with international collaborations of LATMOS (CNRS) in France, the German Institut für Planetenforschung (DLR) and the Institute of Physics of interplanetary Space (IFSI) in Italy which some components/sub-systems contributed to and set up on the TGO spacecraft. ACS consists of three separate infrared spectrometers (channels), sharing common mechanical, electrical, and thermal interfaces. This ensemble of spectrometers has been designed and developed in response to the TGO objectives that specifically address the requirement of high sensitivity instruments to enable the unambiguous detection of trace gases of potential geophysical or biological interest.

Measurement and interface characteristics of the three scientific channels of ACS and the overall values for the whole instrument.

Parameter

NIR

MIR

TIRVIM

ACS
Operation modes Nadir (dayside and night side), SO, Limb

Solar occultation (SO)

Nadir (dayside and night side), SO

 Nadir, SO, Limb
Field of view (FOV)

2°×0.02°
35×0.35 mrad2

10′×0.5′
2.9×0.15 mrad2

2.5° for Nadir
0.35° (full Solar disk) for SO

  
Spectral range 0.73-1.6 μm

2.3-4.3 μm

1.7-17 μm

 0.73-17 μm
Instantaneous spectral range

50×100 cm−1;

16 nm at 1.37 μm

10×(0.09-0.27 μm)

ex. 3.13-3.41 μm

Full range

  

Time to measure one spectrum

5 s for Nadir
50 ms for SO

0.5-2 s

6.6 s for Nadir (pair)
1.8 s for SO (single)

 

Number of spectra per measurement

not greater than 10

1 or 2

2 in Nadir
1 in SO

 

Spectral resolution / resolving power

λ/Δλ=20,000-27,000

λ/Δλ=30,000–50,000

0.8 cm−1 / 7,600-760 for Nadir
0.13 cm−1 /45,200-4,520 for SO

 

SNR in SO

4,000

2,500–5,000

50–170 (in-flight calibration)
up to 1,000 during measurements

 

NESR in Nadir

0.5 W/m2/sr/μm

N/A

10−4 W/m2/sr/cm−1

 

Mass

3.2 kg

12.2 kg

12 kg

33.5 kg

Power consumption during operations

9 W

21 W

21 W

51 W (peak)

Survival heaters

4 W

10 W

8 W

22 W

Volume

12×35×25 cm3

20×50×60 cm3

20×44×30 cm3

52×60×47 cm3

Data rate (ICD allocation)

0.1 Gbit/day

0.7 Gbit/day

0.7 Gbit/day

1.6 Gbit/day

 

TGO ACS Products have been archived in PDS4 standard. They are grouped into PDS4 collections based on processing level.

PDS4 Collection

Description

PDS4 Bundle / Collection

Raw Data

The ExoMars TGO ACS raw product collection consists of original data from the instrument.

urn:esa:psa:em16_tgo_acs:data_raw

Partially_Processed Data

The ExoMars TGO ACS partially processed product collection consists of beyond raw processed yet not calibrated data.

N/A

Calibrated Data

The ExoMars TGO ACS calibrated product collection includes data converted to physical units with all the channel-specific calibrations applied.

N/A

Derived Data

The ExoMars TGO ACS derived product collection includes highly derived experiment results

N/A