| Title: |
Results on stellar occultations by (307261) 2002 MS4 |
| Authors: |
Luane Rommel, Flavia; Braga-Ribas, Felipe; Pereira, Chrystian Luciano; Desmars, Josselin; Santos-Sanz, Pablo; Benedetti-Rossi Rossi, Gustavo; Ortiz, Jose-Luis; Morales, Nicolás; Jehin, Emmanuel; Camargo, Julio I. B.; Assafin, Marcelo; Morgado, Bruno E.; Vieira-Martins, Roberto; Sicardy, Bruno; Boufleur, Rodrigo; Maury, Alain; Fabrega Polleri, Joaquín; Ceravolo, Peter; Ceravolo, Debra; Gowe, Bruce; Sfair, Rafael; Santana, Thamiris; Mammana, Luis A.; Lajus, Eduardo F.; Colazo, Carlos A.; Spagnotto, Julio; Gomes-Júnior, Altair R.; Winter, Othon |
| Source: |
14th Europlanet Science Congress 2020 (EPSC2020), 21 September 2020 - 9 October, 202 |
| Publication Year: |
2020 |
| Collection: |
University of Liège: ORBi (Open Repository and Bibliography) |
| Subject Terms: |
Physical; chemical; mathematical & earth Sciences; Space science; astronomy & astrophysics; Physique; chimie; mathématiques & sciences de la terre; Aérospatiale; astronomie & astrophysique |
| Description: |
Transneptunian Objects (TNOs) are the remnants of our planetary system and can retain information about the early stages of the Solar System formation. Stellar occultation is a ground-based method used to study these distant bodies which have been presenting exciting results mainly about their physical properties. The big TNO called 2002 MS4 was discovered by Trujillo, C. A., & Brown, M. E., in 2002 using observations made at the Palomar Observatory (EUA). It is classified as a hot classical TNO, with orbital parameters a = 42 AU, e = 0.139, and i = 17.7°. Using thermal measurements with PACS (Herschel) and MIPS (Spitzer Space Telescope) instruments, Vilenius et al. 2012 obtained a radius of 467 +/- 23.5 km and an albedo of 0.051.Predictions of stellar occultations by this body in 2019 were obtained using the Gaia DR2 catalogue and NIMA ephemeris (Desmars et al. 2015) and made available in the Lucky Star web page (https://lesia.obspm.fr/lucky-star/). Four events were observed in South America and Canada. The first stellar occultation was detected on 09 July 2019, resulting in two positives and four negatives chords, including a close one which proven to be helpful to constrain the body"s size. This detection also allowed us to obtain a precise astrometric position that was used to update its ephemeris and improve the predictions of the following events. Two of them were detected on 26 July 2019, separated by eight hours. The first event was observed from South America and resulted in three positive detections, while the second, observed from Canada, resulted in a single chord. Another double chord event was observed on 19 August 2019 also from Canada.Due to its size, it is expected that 2002 MS4 is in hydrostatic equilibrium. Thirouin, A. 2013 obtained a rotational light curve of 2002 MS4 and determined two possible periods (7.33 h and 10.44 h) with low amplitude variation (0.05 +/- 0.01 mag). Admitting that it has a Maclaurin shape, the projected limb in the sky plane for Earth-based observers should be the ... |
| Document Type: |
conference object |
| Language: |
English |
| Relation: |
info:eu-repo/grantAgreement/EC/H2020/669416; https://www.epsc2020.eu/, id. EPSC2020-866; https://ui.adsabs.harvard.edu/abs/2020EPSC.14.866L; https://orbi.uliege.be/handle/2268/253802; info:hdl:2268/253802 |
| DOI: |
10.5194/epsc2020-866 |
| Availability: |
https://orbi.uliege.be/handle/2268/253802; https://orbi.uliege.be/bitstream/2268/253802/1/EPSC2020-866-print.pdf; https://doi.org/10.5194/epsc2020-866 |
| Rights: |
open access ; http://purl.org/coar/access_right/c_abf2 ; info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.D70D6786 |
| Database: |
BASE |