Spectral Variations across Latitudes on Asteroid (3200) Phaethon
3200 Phaethon is a near-Earth asteroid known to be actively emitting dust and gas when near its perihelion, and it is the target of the Japanese DESTINY+ mission. Several visible–near-IR spectra were obtained of Phaethon during 2003–2017, which have been collected together and analyzed with respect...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ada60d |
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| author | M. Angrisani E. Palomba A. Longobardo E. Rognini A. Migliorini E. D’Aversa G. Pratesi C. Gisellu F. Dirri L. Piazzo T. Arai |
| author_facet | M. Angrisani E. Palomba A. Longobardo E. Rognini A. Migliorini E. D’Aversa G. Pratesi C. Gisellu F. Dirri L. Piazzo T. Arai |
| author_sort | M. Angrisani |
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| description | 3200 Phaethon is a near-Earth asteroid known to be actively emitting dust and gas when near its perihelion, and it is the target of the Japanese DESTINY+ mission. Several visible–near-IR spectra were obtained of Phaethon during 2003–2017, which have been collected together and analyzed with respect to its shape model. Using a thermal model, we examine the diurnal temperature variations across Phaethon’s surface (Δ T ∼ 600 K). We find different solar radiation heating between the north and south regions, with very high surface temperatures in the south region (max peak ∼ 1050 K), while a lower temperature is found in the north region (a mean value of 760 K). Our analysis of the photometrically corrected slope suggests a latitudinal trend in surface composition. We propose that the northern region of Phaethon may be linked to unusual chondrites and naturally heated Y-82162 samples (63–125 μ m and/or chips), while the southern region shows similarities to Ivuna CI chondrites heated to 700°C (0–125 μ m). The equatorial region appears to include a mixture of materials from both hemispheres. |
| format | Article |
| id | doaj-art-20c0914a06d3418c8f3f52611c752568 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-20c0914a06d3418c8f3f52611c7525682025-02-07T08:48:30ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01980112710.3847/1538-4357/ada60dSpectral Variations across Latitudes on Asteroid (3200) PhaethonM. Angrisani0https://orcid.org/0000-0002-2178-521XE. Palomba1A. Longobardo2E. Rognini3A. Migliorini4E. D’Aversa5G. Pratesi6C. Gisellu7F. Dirri8L. Piazzo9T. Arai10INAF-IAPS Rome, Italy, Via Fosso del Cavaliere, 100 Rome; Sapienza University of Rome , Italy ; marianna.angrisani@inaf.itINAF-IAPS Rome , Italy, Via Fosso del Cavaliere, 100 Rome, ItalyINAF-IAPS Rome , Italy, Via Fosso del Cavaliere, 100 Rome, ItalyASI Space Science Data Center (SSDC) , Via del Politecnico, 00133 Rome, ItalyINAF-IAPS Rome , Italy, Via Fosso del Cavaliere, 100 Rome, ItalyINAF-IAPS Rome , Italy, Via Fosso del Cavaliere, 100 Rome, ItalyDepartment of Earth Sciences, University of Firenze , Via G. La Pira 4, 50121, Florence, ItalyINAF-IAPS Rome, Italy, Via Fosso del Cavaliere, 100 Rome; Sapienza University of Rome , Italy ; marianna.angrisani@inaf.itINAF-IAPS Rome , Italy, Via Fosso del Cavaliere, 100 Rome, ItalyDepartment of Information Engineering, Electronics and Telecommunications (DIET), “La Sapienza”, University of Rome , 00184 Rome, ItalyPlanetary Exploration Research Center (PERC), Chiba Institute of Technology , Chiba 275-0016, Japan3200 Phaethon is a near-Earth asteroid known to be actively emitting dust and gas when near its perihelion, and it is the target of the Japanese DESTINY+ mission. Several visible–near-IR spectra were obtained of Phaethon during 2003–2017, which have been collected together and analyzed with respect to its shape model. Using a thermal model, we examine the diurnal temperature variations across Phaethon’s surface (Δ T ∼ 600 K). We find different solar radiation heating between the north and south regions, with very high surface temperatures in the south region (max peak ∼ 1050 K), while a lower temperature is found in the north region (a mean value of 760 K). Our analysis of the photometrically corrected slope suggests a latitudinal trend in surface composition. We propose that the northern region of Phaethon may be linked to unusual chondrites and naturally heated Y-82162 samples (63–125 μ m and/or chips), while the southern region shows similarities to Ivuna CI chondrites heated to 700°C (0–125 μ m). The equatorial region appears to include a mixture of materials from both hemispheres.https://doi.org/10.3847/1538-4357/ada60dAsteroidsSmall Solar System bodiesSpectroscopyMeteorites |
| spellingShingle | M. Angrisani E. Palomba A. Longobardo E. Rognini A. Migliorini E. D’Aversa G. Pratesi C. Gisellu F. Dirri L. Piazzo T. Arai Spectral Variations across Latitudes on Asteroid (3200) Phaethon The Astrophysical Journal Asteroids Small Solar System bodies Spectroscopy Meteorites |
| title | Spectral Variations across Latitudes on Asteroid (3200) Phaethon |
| title_full | Spectral Variations across Latitudes on Asteroid (3200) Phaethon |
| title_fullStr | Spectral Variations across Latitudes on Asteroid (3200) Phaethon |
| title_full_unstemmed | Spectral Variations across Latitudes on Asteroid (3200) Phaethon |
| title_short | Spectral Variations across Latitudes on Asteroid (3200) Phaethon |
| title_sort | spectral variations across latitudes on asteroid 3200 phaethon |
| topic | Asteroids Small Solar System bodies Spectroscopy Meteorites |
| url | https://doi.org/10.3847/1538-4357/ada60d |
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