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Peer-reviewedCC BYAstronomy & Astrophysics

Infrared-to-visible albedo ratio of Phobos

  • Dyer T. J.1
  • Beccarelli J.2
  • Delbo M.1
  • Avdellidou C.3
  • Pajola M.2
  • Milton A.4
  • Lucchetti A.2
  • Munaretto G.2
4 affiliations
  1. 1Université Côte d’Azur, CNRS–Lagrange, Observatoire de la Côte d’Azur
  2. 2Istituto Nazionale di Astrofisica (INAF) – Osservatorio Astronomico di Padova (OAPd)
  3. 3University of Leicester, School of Physics and Astronomy
  4. 4University of Leicester, School of Natural Sciences
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Abstract

Aims. The ratio between infrared and visible albedo, pIR/pV, provides a simple proxy for the spectral slope of asteroid surfaces between the visible and near-infrared wavelength ranges. The aim of this work is to assess whether the different spectral units of Phobos occupy the same spectral parameter space as primitive asteroid populations in order to confirm, or not, its possible asteroidal origin. Methods. For each of the three spectral units of Phobos (red, transitional, and blue), we extracted averaged, normalised reflectance spectra by comparing normalised reflectance in the visible (0.50–0.60 m) and near-infrared (3.1–3.8 m) wavelength ranges from the Mars Express OMEGA instrument to compute a proxy for the infrared-visible albedo ratio (RP). Then, using the database of visible and infrared albedos compiled in the Minor Planet Physical Properties Catalogue (MP3C), we computed asteroid pIR/pV values (RA) for comparison with those of Phobos. Results. The RP values for the red, transitional, and blue regions vary between 2.90 and 3.12, 2.32 and 2.35, 1.64 and 1.85, respectively. These values span a range occupied by primitive asteroid populations, with the transitional and red regions coinciding with the high ratio regime within the pIR/pV domain, commonly associated with red-sloped primitive asteroids, including D- and T-type objects as well as Jupiter trojans.

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Cite

BibTeXRIS
BibTeX
@article{t2026infraredtovisible,
  title = {{Infrared-to-visible albedo ratio of Phobos}},
  author = {Dyer T. J. and Beccarelli J. and Delbo M. and Avdellidou C. and Pajola M. and Milton A. and Lucchetti A. and Munaretto G.},
  journal = {Astronomy \& Astrophysics},
  year = {2026},
  month = oct,
  doi = {10.1051/0004-6361/202661534},
  url = {https://doi.org/10.1051/0004-6361/202661534},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Infrared-to-visible albedo ratio of Phobos
AU  - Dyer T. J.
AU  - Beccarelli J.
AU  - Delbo M.
AU  - Avdellidou C.
AU  - Pajola M.
AU  - Milton A.
AU  - Lucchetti A.
AU  - Munaretto G.
PY  - 2026
DA  - 2026/10/23
JO  - Astronomy & Astrophysics
DO  - 10.1051/0004-6361/202661534
UR  - https://doi.org/10.1051/0004-6361/202661534
AB  - Aims. The ratio between infrared and visible albedo, pIR/pV, provides a simple proxy for the spectral slope of asteroid surfaces between the visible and near-infrared wavelength ranges. The aim of this work is to assess whether the different spectral units of Phobos occupy the same spectral parameter space as primitive asteroid populations in order to confirm, or not, its possible asteroidal origin. Methods. For each of the three spectral units of Phobos (red, transitional, and blue), we extracted averaged, normalised reflectance spectra by comparing normalised reflectance in the visible (0.50–0.60 m) and near-infrared (3.1–3.8 m) wavelength ranges from the Mars Express OMEGA instrument to compute a proxy for the infrared-visible albedo ratio (RP). Then, using the database of visible and infrared albedos compiled in the Minor Planet Physical Properties Catalogue (MP3C), we computed asteroid pIR/pV values (RA) for comparison with those of Phobos. Results. The RP values for the red, transitional, and blue regions vary between 2.90 and 3.12, 2.32 and 2.35, 1.64 and 1.85, respectively. These values span a range occupied by primitive asteroid populations, with the transitional and red regions coinciding with the high ratio regime within the pIR/pV domain, commonly associated with red-sloped primitive asteroids, including D- and T-type objects as well as Jupiter trojans.
SN  - 0004-6361
SN  - 1432-0746
ER  -