The Venus Emissivity Mapper (VEM): advanced development status and performance evaluation

Helbert, J.; Säuberlich, Thomas; Dyar, M. D.; Ryan, Conor; Walter, Ingo; Réess, Jean-Michel; Rosas-Ortiz, Yaquelin M.; Peter, G.; Maturilli, Alessandro; Arnold, Gabriele

doi:10.1117/12.2567634

Cited by 13 publications

(9 citation statements)

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“…This atmospheric correction technique for the transparent windows in the atmosphere of Venus around 1 m (Fig. 4) and expected uncertainties from the instrument and topography uncertainties for a VEM-like instrument have been discussed in (36,45) as an update of the work in (10,46,47) for VIRTIS on Venus Express. The analysis shows that a VEM-like instrument can achieve an uncertainty in the surface emissivity retrieval of significantly less than 4%.…”

Section: Atmospheric Uncertaintiesmentioning

confidence: 99%

Deriving iron contents from past and future Venus surface spectra with new high-temperature laboratory emissivity data

Helbert¹,

Maturilli²,

Dyar

et al. 2021

Sci. Adv.

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In situ information on the surface composition of Venus is based on measurements of a small number of landing sites. In the laboratory, we measured the emissivity of a range of igneous rocks at temperatures up to 480°C. We show that high-temperature laboratory spectra of basalts are consistent with the only existing multispectral data from the surface of Venus obtained by the photometers on the Venera 9 and 10 landers. We derive the FeO abundances for these landing sites of 12.2 and 9.5 weight %, respectively. From orbit, Venus’ surface is only observable on the nightside through small spectral windows near 1 μm where the CO2 atmosphere is largely transparent. The new laboratory data show that different rock types can be distinguished using only a small set of spectral bands. Therefore, future orbital spectral observations can provide a much-needed global composition map.

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Section: Atmospheric Uncertaintiesmentioning

confidence: 99%

Deriving iron contents from past and future Venus surface spectra with new high-temperature laboratory emissivity data

Helbert¹,

Maturilli²,

Dyar

et al. 2021

Sci. Adv.

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“…The approach adopted for the evaluation of the VEM/VenSpec-M radiometric performance is described in detail in [5,6]. It is based on analysis of the corresponding signal chain, including the passage of a simulated radiometric scene signal of the planet Venus through the VEM/VenSpec-M optics, detector, analog and digital electronics.…”

Section: Instrument Performance Evaluationmentioning

confidence: 99%

“…This paper describes the on-ground and in-flight calibration approach (and its heritage) of the VEM/VenSpec-M instrument as well as the supporting laboratory measurements for calibration and scientific data analysis. The VEM/VenSpec-M system design has been described in detail [3,4] including the performance evaluation model of the instrument [5,6]. An update on the instrument performance model results is reported in section 4 of this paper.…”

Section: Introductionmentioning

confidence: 99%

Laboratory VNIR emissivity of Venus analog rocks and the VEM on VERITAS and the VenSpec-M on EnVision calibration and data verification plan

Alemanno,

Helbert,

Maturilli

et al. 2023

Infrared Remote Sensing and Instrumentation XXXI

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The Venus Emissivity Mapper (VEM) and the VenSpec-M on the NASA VERITAS and ESA EnVision missions, respectively, are multi-spectral imaging systems designed specifically for mapping the surface of Venus using near-infrared atmospheric windows around 1 μm. VEM/VenSpec-M will provide the first global map of rock types on the surface of Venus as well as constant monitoring for volcanic activity at global (VERITAS) and regional/local (EnVision) scales. The VEM/VenSpec-M verification plan ensures accurate performance and science return of the instrument and includes on-ground and in-flight instrument calibrations as well as supporting laboratory measurements for calibration and scientific data analysis. Pre-flight calibrations encompass geometric, spectral, and radiometric calibrations based on the MERTIS (on BepiColombo) calibration campaign and pipeline. Laboratory work involves the creation of spectral libraries of increasing complexity by measuring the emissivity of Venus analogs under Venus surface conditions. These data will distinguish between basalt and felsic rock types on the Venus surface and may enable the identification of intermediate compositions based on iron content. Data analysis uses machine learning models for classification between basalt and felsic rocks and regression to predict FeO content using laboratory calibration data. The data verification plan outlined here not only provides fundamental data needed for VEM/VenSpec-M, but can also be adapted to create data products suitable for calibration of the VenDi (Venus Descent Imager) instrument on the DAVINCI mission. Such use of an integrated calibration plan will benefit all three missions and produce coordinated results that can be directly compared.

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“…T HE recently selected NASA Discovery mission, Venus Emissivity, Radio Science, InSAR, Topography, and Spectroscopy (VERITAS), will orbit Earth's neighboring planet and gather foundational datasets that will address many open questions on its dynamic history and active geophysical processes [1]. The scientific objectives of VERITAS will be enabled by a gravity investigation, relying on the Integrated Deep Space Transponder (IDST) operating in both X-and Ka-band [2][3][4], the X-band Venus Interferometric Synthetic Aperture Radar (VISAR) [5], and an infrared spectrometer, the Venus Emissivity Mapper (VEM) [6].…”

Section: Introductionmentioning

confidence: 99%

Improving the VERITAS Orbit Reconstruction Using Radar Tie Points

Cascioli

Durante

Mazarico

et al. 2023

Journal of Spacecraft and Rockets

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The Venus Emissivity Mapper (VEM): advanced development status and performance evaluation

Cited by 13 publications

References 0 publications

Deriving iron contents from past and future Venus surface spectra with new high-temperature laboratory emissivity data

Deriving iron contents from past and future Venus surface spectra with new high-temperature laboratory emissivity data

Laboratory VNIR emissivity of Venus analog rocks and the VEM on VERITAS and the VenSpec-M on EnVision calibration and data verification plan

Improving the VERITAS Orbit Reconstruction Using Radar Tie Points

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