Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability
© 2016 Elsevier Inc. Here we explore a technique for constraining physical properties of near-Earth asteroids (NEAs) based on variability in thermal emission as a function of viewing aspect. We present case studies of the low albedo, near-Earth asteroids (285263) 1998 QE2 and (175706) 1996 FG3. The...
| Main Authors: | , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Elsevier BV
2021
|
| Online Access: | https://hdl.handle.net/1721.1/134089 |
| _version_ | 1826198939492155392 |
|---|---|
| author | Moskovitz, Nicholas A Polishook, David DeMeo, Francesca E Binzel, Richard P Endicott, Thomas Yang, Bin Howell, Ellen S Vervack, Ronald J Fernández, Yanga R |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Moskovitz, Nicholas A Polishook, David DeMeo, Francesca E Binzel, Richard P Endicott, Thomas Yang, Bin Howell, Ellen S Vervack, Ronald J Fernández, Yanga R |
| author_sort | Moskovitz, Nicholas A |
| collection | MIT |
| description | © 2016 Elsevier Inc. Here we explore a technique for constraining physical properties of near-Earth asteroids (NEAs) based on variability in thermal emission as a function of viewing aspect. We present case studies of the low albedo, near-Earth asteroids (285263) 1998 QE2 and (175706) 1996 FG3. The Near-Earth Asteroid Thermal Model (NEATM) is used to fit signatures of thermal emission in near-infrared (0.8 - 2.5 µm) spectral data. This analysis represents a systematic study of thermal variability in the near-IR as a function of phase angle. The observations of QE2 imply that carefully timed observations from multiple viewing geometries can be used to constrain physical properties like retrograde versus prograde pole orientation and thermal inertia. The FG3 results are more ambiguous with detected thermal variability possibly due to systematic issues with NEATM, an unexpected prograde rotation state, or a surface that is spectrally and thermally heterogenous. This study highlights the potential diagnostic importance of high phase angle thermal measurements on both sides of opposition. We find that the NEATM thermal beaming parameters derived from our near-IR data tend to be of order10’s of percent higher than parameters from ensemble analyses of longer wavelength data sets. However, a systematic comparison of NEATM applied to data in different wavelength regimes is needed to understand whether this offset is simply a reflection of small number statistics or an intrinsic limitation of NEATM when applied to near-IR data. With the small sample presented here, it remains unclear whether NEATM modeling at near-IR wavelengths can robustly determine physical properties like pole orientation and thermal inertia. |
| first_indexed | 2024-09-23T11:12:15Z |
| format | Article |
| id | mit-1721.1/134089 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:12:15Z |
| publishDate | 2021 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1340892023-09-27T17:41:18Z Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability Moskovitz, Nicholas A Polishook, David DeMeo, Francesca E Binzel, Richard P Endicott, Thomas Yang, Bin Howell, Ellen S Vervack, Ronald J Fernández, Yanga R Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences © 2016 Elsevier Inc. Here we explore a technique for constraining physical properties of near-Earth asteroids (NEAs) based on variability in thermal emission as a function of viewing aspect. We present case studies of the low albedo, near-Earth asteroids (285263) 1998 QE2 and (175706) 1996 FG3. The Near-Earth Asteroid Thermal Model (NEATM) is used to fit signatures of thermal emission in near-infrared (0.8 - 2.5 µm) spectral data. This analysis represents a systematic study of thermal variability in the near-IR as a function of phase angle. The observations of QE2 imply that carefully timed observations from multiple viewing geometries can be used to constrain physical properties like retrograde versus prograde pole orientation and thermal inertia. The FG3 results are more ambiguous with detected thermal variability possibly due to systematic issues with NEATM, an unexpected prograde rotation state, or a surface that is spectrally and thermally heterogenous. This study highlights the potential diagnostic importance of high phase angle thermal measurements on both sides of opposition. We find that the NEATM thermal beaming parameters derived from our near-IR data tend to be of order10’s of percent higher than parameters from ensemble analyses of longer wavelength data sets. However, a systematic comparison of NEATM applied to data in different wavelength regimes is needed to understand whether this offset is simply a reflection of small number statistics or an intrinsic limitation of NEATM when applied to near-IR data. With the small sample presented here, it remains unclear whether NEATM modeling at near-IR wavelengths can robustly determine physical properties like pole orientation and thermal inertia. 2021-10-27T19:58:02Z 2021-10-27T19:58:02Z 2017 2019-09-26T12:59:50Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134089 Moskovitz, N. A., et al. "Near-Infrared Thermal Emission from near-Earth Asteroids: Aspect-Dependent Variability." Icarus 284 (2017): 97-105. en 10.1016/J.ICARUS.2016.11.011 Icarus Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier BV arXiv |
| spellingShingle | Moskovitz, Nicholas A Polishook, David DeMeo, Francesca E Binzel, Richard P Endicott, Thomas Yang, Bin Howell, Ellen S Vervack, Ronald J Fernández, Yanga R Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability |
| title | Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability |
| title_full | Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability |
| title_fullStr | Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability |
| title_full_unstemmed | Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability |
| title_short | Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability |
| title_sort | near infrared thermal emission from near earth asteroids aspect dependent variability |
| url | https://hdl.handle.net/1721.1/134089 |
| work_keys_str_mv | AT moskovitznicholasa nearinfraredthermalemissionfromnearearthasteroidsaspectdependentvariability AT polishookdavid nearinfraredthermalemissionfromnearearthasteroidsaspectdependentvariability AT demeofrancescae nearinfraredthermalemissionfromnearearthasteroidsaspectdependentvariability AT binzelrichardp nearinfraredthermalemissionfromnearearthasteroidsaspectdependentvariability AT endicottthomas nearinfraredthermalemissionfromnearearthasteroidsaspectdependentvariability AT yangbin nearinfraredthermalemissionfromnearearthasteroidsaspectdependentvariability AT howellellens nearinfraredthermalemissionfromnearearthasteroidsaspectdependentvariability AT vervackronaldj nearinfraredthermalemissionfromnearearthasteroidsaspectdependentvariability AT fernandezyangar nearinfraredthermalemissionfromnearearthasteroidsaspectdependentvariability |