Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian Belt
The 5:3 and 7:4 mean motion resonances of Neptune are at 42.3 and 43.7 au, respectively, and overlap with objects in the classical trans-Neptunian belt (Kuiper Belt). We report the complete/partial lightcurves of 13 and 14 trans-Neptunian objects (TNOs) in the 5:3 and 7:4 resonances, respectively. W...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Planetary Science Journal |
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| Online Access: | https://doi.org/10.3847/PSJ/ad2933 |
| _version_ | 1797231806334894080 |
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| author | Audrey Thirouin Scott S. Sheppard |
| author_facet | Audrey Thirouin Scott S. Sheppard |
| author_sort | Audrey Thirouin |
| collection | DOAJ |
| description | The 5:3 and 7:4 mean motion resonances of Neptune are at 42.3 and 43.7 au, respectively, and overlap with objects in the classical trans-Neptunian belt (Kuiper Belt). We report the complete/partial lightcurves of 13 and 14 trans-Neptunian objects (TNOs) in the 5:3 and 7:4 resonances, respectively. We report a most likely contact binary in the 7:4 resonance, 2013 FR _28 , with a periodicity of 13.97 ± 0.04 hr and a lightcurve amplitude of 0.94 ± 0.02 mag. With a V-/U-shaped lightcurve, 2013 FR _28 has one of the largest well-sampled TNO amplitudes observed with ground-based observations, comparable to the well-determined contact binary 2001 QG _298 . 2013 FR _28 has a mass ratio q ∼ 1 with a density ρ ∼ 1 g cm ^−3 . We find several objects with large amplitudes and classify 2004 SC _60 , 2006 CJ _69 , and 2013 BN _82 as likely contact binaries and 2001 QF _331 , 2003 YW _179 , and 2015 FP _345 as likely elongated objects. We observe the 17:9 resonant or classical object 2003 SP _317 that we classify as a likely contact binary. A lower estimate of 10%–50% and 20%–55% for the fraction of (nearly) equal-sized contact binaries is calculated in the 5:3 and 7:4 resonances, respectively. Surface colors of 2004 SC _60 , 2013 BN _82 , 2014 OL _394 , and 2015 FP _345 have been obtained. Including these colors with ones from the literature reveals that elongated objects and contact binaries share the same ultrared surface color, except Manwë–Thorondor and 2004 SC _60 . Not only are the colors of the 7:4 and 5:3 TNOs similar to the cold classicals, but we demonstrate that the rotational properties of the 5:3 and 7:4 resonants are similar to those of the cold classicals, inferring a clear link between these subpopulations. |
| first_indexed | 2024-04-24T15:50:14Z |
| format | Article |
| id | doaj.art-5405f8ac34134ff9b6c162fe3247ab2d |
| institution | Directory Open Access Journal |
| issn | 2632-3338 |
| language | English |
| last_indexed | 2024-04-24T15:50:14Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Planetary Science Journal |
| spelling | doaj.art-5405f8ac34134ff9b6c162fe3247ab2d2024-04-01T12:34:49ZengIOP PublishingThe Planetary Science Journal2632-33382024-01-01548410.3847/PSJ/ad2933Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian BeltAudrey Thirouin0https://orcid.org/0000-0002-1506-4248Scott S. Sheppard1https://orcid.org/0000-0003-3145-8682Lowell Observatory , 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA ; thirouin@lowell.eduEarth and Planets Laboratory, Carnegie Institution for Science , 5241 Broad Branch Road NW, Washington, DC 20015, USAThe 5:3 and 7:4 mean motion resonances of Neptune are at 42.3 and 43.7 au, respectively, and overlap with objects in the classical trans-Neptunian belt (Kuiper Belt). We report the complete/partial lightcurves of 13 and 14 trans-Neptunian objects (TNOs) in the 5:3 and 7:4 resonances, respectively. We report a most likely contact binary in the 7:4 resonance, 2013 FR _28 , with a periodicity of 13.97 ± 0.04 hr and a lightcurve amplitude of 0.94 ± 0.02 mag. With a V-/U-shaped lightcurve, 2013 FR _28 has one of the largest well-sampled TNO amplitudes observed with ground-based observations, comparable to the well-determined contact binary 2001 QG _298 . 2013 FR _28 has a mass ratio q ∼ 1 with a density ρ ∼ 1 g cm ^−3 . We find several objects with large amplitudes and classify 2004 SC _60 , 2006 CJ _69 , and 2013 BN _82 as likely contact binaries and 2001 QF _331 , 2003 YW _179 , and 2015 FP _345 as likely elongated objects. We observe the 17:9 resonant or classical object 2003 SP _317 that we classify as a likely contact binary. A lower estimate of 10%–50% and 20%–55% for the fraction of (nearly) equal-sized contact binaries is calculated in the 5:3 and 7:4 resonances, respectively. Surface colors of 2004 SC _60 , 2013 BN _82 , 2014 OL _394 , and 2015 FP _345 have been obtained. Including these colors with ones from the literature reveals that elongated objects and contact binaries share the same ultrared surface color, except Manwë–Thorondor and 2004 SC _60 . Not only are the colors of the 7:4 and 5:3 TNOs similar to the cold classicals, but we demonstrate that the rotational properties of the 5:3 and 7:4 resonants are similar to those of the cold classicals, inferring a clear link between these subpopulations.https://doi.org/10.3847/PSJ/ad2933Trans-Neptunian objectsResonant Kuiper belt objectsLight curves |
| spellingShingle | Audrey Thirouin Scott S. Sheppard Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian Belt The Planetary Science Journal Trans-Neptunian objects Resonant Kuiper belt objects Light curves |
| title | Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian Belt |
| title_full | Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian Belt |
| title_fullStr | Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian Belt |
| title_full_unstemmed | Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian Belt |
| title_short | Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian Belt |
| title_sort | rotational study of 5 3 and 7 4 resonant objects within the main classical trans neptunian belt |
| topic | Trans-Neptunian objects Resonant Kuiper belt objects Light curves |
| url | https://doi.org/10.3847/PSJ/ad2933 |
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