LicenseRef-Nyx-Data

The data files in nyx/data/ are not covered by the BSD-3-Clause license. They are redistributed for scientific use under the terms of their original sources, with attribution as listed below.

If you publish results obtained with nyx, you are responsible for citing the datasets you used in addition to citing nyx itself (see CITATION.cff in the repository root).

The nyx source code is licensed under BSD-3-Clause (see LICENSE). The datasets described below are not covered by that license; they remain under the terms of their respective originators. In particular, the Gaia-derived dataset downloaded at runtime is distributed by ESA under a non-commercial (CC BY-NC 3.0 IGO) license; commercial use of nyx in configurations that rely on this dataset requires separate arrangement with ESA.

Bundled data (shipped inside the package, in nyx/data/)

Pickles (1998) stellar spectral atlas

Files:

pickles1998_trds_atlas.dat

Used by:

nyx.spectra.SpectralGrid.from_pickles1998, behind the stellar spectral models of Stars, BrightStars and gaia_star_field

Description:

Library of stellar spectral templates spanning a wide range of spectral types, used here as the empirical spectral model for stars.

Reference:

Pickles, A. J. 1998, “A Stellar Spectral Flux Library: 1150-25000 A”, PASP, 110, 863. DOI: 10.1086/316197

Usage terms:

Published in the peer-reviewed literature and freely available for research use; please cite the reference above.

Leinert et al. (1998) zodiacal light

Files:

leinert1998_zodiacal_light.dat

Used by:

nyx.emitter.ZodiacalLight.from_leinert1998

Description:

Tabulated zodiacal light brightness as a function of ecliptic coordinates.

Reference:

Leinert, C., Bowyer, S., Haikala, L. K., et al. 1998, “The 1997 reference of diffuse night sky brightness”, A&AS, 127, p. 1-99 DOI: 10.1051/aas:1998105

Usage terms:

Published in the peer-reviewed literature and freely available for research use; please cite the reference above.

ROLO lunar irradiance model coefficients

Files:

jones2013_lunar_rolo.dat

Used by:

nyx.emitter.Moon.from_jones2013

Description:

Fit coefficients of the ROLO (RObotic Lunar Observatory) lunar irradiance model, in 25 wavelength bands.

Note on naming:

The file name and Moon.from_jones2013 refer to the sky-brightness model of Jones et al. (2013), which adopts the ROLO model. The coefficient values themselves originate with Kieffer & Stone (2005). Both works should be cited.

References:

  • Kieffer, H. H. & Stone, T. C. 2005, “The Spectral Irradiance of the Moon”, AJ, 129, 2887. DOI: 10.1086/430185

  • Jones, A., Noll, S., Kausch, W., et al. 2013, “An advanced scattered moonlight model for Cerro Paranal”, A&A, 560, A91. DOI: 10.1051/0004-6361/201322433

Usage terms:

Published in the peer-reviewed literature and freely available for research use; please cite the references above.

ESO SkyCalc airglow and ozone spectra

Files:

eso_skycalc_airglow_130sfu.dat, eso_skycalc_ozone_absorption.dat

Used by:

nyx.emitter.Airglow.from_eso_skycalc (airglow) and nyx.atmosphere.tau_ozone, behind SingleScattering.from_hg_ozone (ozone)

Description:

Airglow emission spectrum (at 130 solar flux units) and ozone absorption spectrum, generated with the ESO SkyCalc Sky Model Calculator (https://www.eso.org/observing/etc/skycalc/).

References:

  • Noll, S., Kausch, W., Barden, M., et al. 2012, “An atmospheric radiation model for Cerro Paranal”, A&A, 543, A92. DOI: 10.1051/0004-6361/201219040

  • Jones, A., Noll, S., Kausch, W., et al. 2013, A&A, 560, A91. DOI: 10.1051/0004-6361/201322433

Usage terms:

Output of the publicly available ESO SkyCalc tool; please cite the references above and acknowledge the ESO SkyCalc tool.

XHIP bright-star compilation (Anderson & Francis 2012)

Files:

anderson2012_xhip_suppl.dat

Used by:

nyx.emitter.catalogs.xhip, behind nyx.emitter.BrightStars.from_anderson2012

Description:

Positions, proper motions and UBVRI photometry for the Hipparcos bright stars, extracted from the XHIP compilation and distributed via the CDS/VizieR service.

References:

  • Anderson, E. & Francis, C. 2012, “XHIP: An extended Hipparcos compilation”, Astronomy Letters, 38, 331. DOI: 10.1134/S1063773712050015

  • VizieR catalogue V/137D.

Usage terms:

Distributed by the Centre de Donnees astronomiques de Strasbourg (CDS). Please cite the reference above and acknowledge the use of the VizieR catalogue access tool, CDS, Strasbourg, France (DOI: 10.26093/cds/vizier).

Data downloaded at runtime

These datasets are not shipped with nyx; they are fetched on first use and cached locally via astropy.utils.data.download_file().

Gaia DR3 stellar catalogue

Source:

Zenodo record 15396676 (gaiadr3.npy, gaia_mag15plus.npy); https://zenodo.org/records/15396676

Used by:

nyx.emitter.Stars.from_gaia_dr3 and nyx.emitter.gaia_star_field

Description:

Simplified star catalogue derived from Gaia Data Release 3 catalogue, repackaged for stellar-contribution simulations.

References:

  • Gaia Collaboration, Prusti, T., de Bruijne, J. H. J., et al. 2016, “The Gaia mission”, A&A, 595, A1. DOI: 10.1051/0004-6361/201629272

  • Gaia Collaboration, Vallenari, A., Brown, A. G. A., et al. 2023, “Gaia Data Release 3”, A&A, 674, A1. DOI: 10.1051/0004-6361/202243940

License:

Distributed under the CC BY-NC 3.0 IGO license, matching the terms under which ESA distributes Gaia data. See the Gaia Data License and the ESA Science Archives Terms and Conditions. Commercial use requires separate arrangement with ESA. Credit: ESA / Gaia / DPAC (Gaia DR3); ESA (Hipparcos).

Required acknowledgement:

Publications must include the verbatim Gaia acknowledgement:

This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.

See the Gaia DR3 credit and citation instructions for full requirements.

STScI solsys solar spectrum (Rieke 2008)

Source:

STScI synphot reference atlases, grid/solsys/solar_spec.fits (https://archive.stsci.edu/hlsps/reference-atlases/cdbs/grid/solsys/)

Used by:

nyx.spectra.load_solar_spectrum_rieke2008 and nyx.spectra.load_solar_flux, behind Moon.from_jones2013 and ZodiacalLight.from_leinert1998

Description:

Composite solar spectrum (0.2–30 µm) distributed with Rieke et al. (2008). Built from Thuillier et al. (2003) below 2.4 µm, the Holweger & Müller (1974) LTE model at longer wavelengths, with the 4–6.5 µm region adjusted to match Wallace & Livingston (2003) CO features. Normalized to 1 AU.

Reference:

Rieke, G. H., Blaylock, M., Decin, L., et al. 2008, “Absolute Physical Calibration in the Infrared”, AJ, 135, 2245. DOI: 10.1088/0004-6256/135/6/2245

Usage terms:

Publicly distributed by STScI.

STScI CALSPEC Vega spectrum

Source:

STScI CALSPEC database, alpha_lyr_stis_012.fits (https://www.stsci.edu/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calspec)

Used by:

nyx.spectra.Bandpass.vegazero, behind the colour grids of Stars.from_gaia_dr3, gaia_star_field and BrightStars.from_anderson2012

Description:

Composite absolute-flux SED of Vega on the HST/CALSPEC flux scale, combining STIS spectrophotometry with a tailored Kurucz 9550 K model atmosphere. Used as the primary optical/IR flux standard.

Reference:

Bohlin, R. C., Hubeny, I. & Rauch, T. 2020, “New Grids of Pure-hydrogen White Dwarf NLTE Model Atmospheres and the HST/STIS Flux Calibration”, AJ, 160, 21. DOI: 10.3847/1538-3881/ab94b4; Bohlin, R. C. 2014, “Hubble Space Telescope CALSPEC Flux Standards: Sirius (and Vega)”, AJ, 147, 127. DOI: 10.1088/0004-6256/147/6/127

Usage terms:

Publicly distributed by STScI.

SVO Filter Profile Service

Source:

Spanish Virtual Observatory Filter Profile Service (http://svo2.cab.inta-csic.es/theory/fps/)

Used by:

nyx.spectra.Bandpass.from_SVO: the Gaia DR3 G/BP/RP passbands for Stars.from_gaia_dr3 and gaia_star_field, and the Johnson B/V passbands for BrightStars.from_anderson2012

Description:

Filter transmission curves.

References:
Required acknowledgement:

Publications should include this acknowledgement:

This research has made use of the SVO Filter Profile Service “Carlos Rodrigo”, funded by MCIN/AEI/10.13039/501100011033/ through grant PID2023-146210NB-I00.