Thermal Properties of 1847 WISE-observed Asteroids
We present new thermophysical model fits of 1847 asteroids, deriving thermal inertia, diameter, and Bond and visible geometric albedo. We use thermal flux measurements obtained by the Wide-field Infrared Survey Explorer (WISE) during its fully cryogenic phase, when both the 12 μ m ( W3 ) and 22 μ m...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2022-01-01
|
| Series: | The Planetary Science Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/PSJ/ac4d1f |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850147126445604864 |
|---|---|
| author | Denise Hung Josef Hanuš Joseph R. Masiero David J. Tholen |
| author_facet | Denise Hung Josef Hanuš Joseph R. Masiero David J. Tholen |
| author_sort | Denise Hung |
| collection | DOAJ |
| description | We present new thermophysical model fits of 1847 asteroids, deriving thermal inertia, diameter, and Bond and visible geometric albedo. We use thermal flux measurements obtained by the Wide-field Infrared Survey Explorer (WISE) during its fully cryogenic phase, when both the 12 μ m ( W3 ) and 22 μ m ( W4 ) bands were available. We take shape models and spin information from the Database of Asteroid Models from Inversion Techniques (DAMIT) and derive new shape models through lightcurve inversion and combining WISE photometry with existing DAMIT lightcurves. When we limit our sample to the asteroids with the most reliable shape models and thermal flux measurements, we find broadly consistent thermal inertia relations with recent studies. We apply fits to the diameters D (km) and thermal inertia Γ (J m ^−2 s ^−0.5 K ^−1 ) normalized to 1 au with a linear relation of the form $\mathrm{log}[{\rm{\Gamma }}]=\alpha +\beta \mathrm{log}[D]$ , where we find α = 2.667 ± 0.059 and β = −0.467 ± 0.044 for our sample alone and α = 2.509 ± 0.017 and β = −0.352 ± 0.012 when combined with other literature estimates. We find little evidence of any correlation between rotation period and thermal inertia, owing to the small number of slow rotators to consider in our sample. While the large uncertainties on the majority of our derived thermal inertia only allow us to identify broad trends between thermal inertia and other physical parameters, we can expect a significant increase in high-quality thermal flux measurements and asteroid shape models with upcoming infrared and wide-field surveys, enabling even more thermophysical modeling of higher precision in the future. |
| format | Article |
| id | doaj-art-d74dbf497ae1483393a099fa6147b34b |
| institution | OA Journals |
| issn | 2632-3338 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Planetary Science Journal |
| spelling | doaj-art-d74dbf497ae1483393a099fa6147b34b2025-08-20T02:27:39ZengIOP PublishingThe Planetary Science Journal2632-33382022-01-01335610.3847/PSJ/ac4d1fThermal Properties of 1847 WISE-observed AsteroidsDenise Hung0https://orcid.org/0000-0001-7523-140XJosef Hanuš1https://orcid.org/0000-0002-2934-3723Joseph R. Masiero2https://orcid.org/0000-0003-2638-720XDavid J. Tholen3https://orcid.org/0000-0003-0773-1888Institute for Astronomy, University of Hawai’i , 2680 Woodlawn Drive, Honolulu, HI 96822, USAInstitute of Astronomy, Faculty of Mathematics and Physics, Charles University , V Holešovičkách 2, 18000 Prague, Czech RepublicCaltech/IPAC , 1200 E. California Boulevard, MC 100-22, Pasadena, CA 91125, USAInstitute for Astronomy, University of Hawai’i , 2680 Woodlawn Drive, Honolulu, HI 96822, USAWe present new thermophysical model fits of 1847 asteroids, deriving thermal inertia, diameter, and Bond and visible geometric albedo. We use thermal flux measurements obtained by the Wide-field Infrared Survey Explorer (WISE) during its fully cryogenic phase, when both the 12 μ m ( W3 ) and 22 μ m ( W4 ) bands were available. We take shape models and spin information from the Database of Asteroid Models from Inversion Techniques (DAMIT) and derive new shape models through lightcurve inversion and combining WISE photometry with existing DAMIT lightcurves. When we limit our sample to the asteroids with the most reliable shape models and thermal flux measurements, we find broadly consistent thermal inertia relations with recent studies. We apply fits to the diameters D (km) and thermal inertia Γ (J m ^−2 s ^−0.5 K ^−1 ) normalized to 1 au with a linear relation of the form $\mathrm{log}[{\rm{\Gamma }}]=\alpha +\beta \mathrm{log}[D]$ , where we find α = 2.667 ± 0.059 and β = −0.467 ± 0.044 for our sample alone and α = 2.509 ± 0.017 and β = −0.352 ± 0.012 when combined with other literature estimates. We find little evidence of any correlation between rotation period and thermal inertia, owing to the small number of slow rotators to consider in our sample. While the large uncertainties on the majority of our derived thermal inertia only allow us to identify broad trends between thermal inertia and other physical parameters, we can expect a significant increase in high-quality thermal flux measurements and asteroid shape models with upcoming infrared and wide-field surveys, enabling even more thermophysical modeling of higher precision in the future.https://doi.org/10.3847/PSJ/ac4d1fAsteroidsMain belt asteroidsAstronomy data modeling |
| spellingShingle | Denise Hung Josef Hanuš Joseph R. Masiero David J. Tholen Thermal Properties of 1847 WISE-observed Asteroids The Planetary Science Journal Asteroids Main belt asteroids Astronomy data modeling |
| title | Thermal Properties of 1847 WISE-observed Asteroids |
| title_full | Thermal Properties of 1847 WISE-observed Asteroids |
| title_fullStr | Thermal Properties of 1847 WISE-observed Asteroids |
| title_full_unstemmed | Thermal Properties of 1847 WISE-observed Asteroids |
| title_short | Thermal Properties of 1847 WISE-observed Asteroids |
| title_sort | thermal properties of 1847 wise observed asteroids |
| topic | Asteroids Main belt asteroids Astronomy data modeling |
| url | https://doi.org/10.3847/PSJ/ac4d1f |
| work_keys_str_mv | AT denisehung thermalpropertiesof1847wiseobservedasteroids AT josefhanus thermalpropertiesof1847wiseobservedasteroids AT josephrmasiero thermalpropertiesof1847wiseobservedasteroids AT davidjtholen thermalpropertiesof1847wiseobservedasteroids |