A high geometric albedo and small size for the haumea cluster member (24835) 1995 SM55 determined from a stellar occultation and photometric observations
| dc.authorid | 0000-0002-8690-2413 | |
| dc.authorid | 0000-0003-0419-1599 | |
| dc.authorid | 0000-0003-1995-0842 | |
| dc.authorid | 0000-0002-6085-3182 | |
| dc.authorid | 0000-0003-2311-2438 | |
| dc.authorid | 0000-0001-8641-0796 | |
| dc.authorid | 0000-0003-2132-7769 | |
| dc.authorid | 0000-0002-9789-1203 | |
| dc.authorid | 0000-0002-3076-164X | |
| dc.authorid | 0000-0003-0088-1808 | |
| dc.contributor.author | Ortiz, Jose L. | |
| dc.contributor.author | Morales Palomino, Nicolas F. | |
| dc.contributor.author | Sicardy, Bruno | |
| dc.contributor.author | Rommel, Flavia Luane | |
| dc.contributor.author | Braga Ribas, Felipe | |
| dc.contributor.author | Kılıç, Yücel | |
| dc.contributor.author | Fernández-Valenzuela, Estela | |
| dc.contributor.author | Rizos García, Juan Luis | |
| dc.contributor.author | Solmaz, Arif | |
| dc.contributor.author | Morgado, Bruno | |
| dc.date.accessioned | 2026-01-06T07:39:22Z | |
| dc.date.available | 2026-01-06T07:39:22Z | |
| dc.date.issued | 2025 | |
| dc.department | Fakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Mekatronik Mühendisliği Bölümü | |
| dc.description.abstract | Context. Trans-Neptunian objects (TNOs) are thought to be some of the most ancient and primitive bodies in our Solar System. Understanding their basic physical properties is crucial to unraveling their origin and the evolution of the outer Solar System beyond Neptune. Stellar occultations are a highly effective and sensitive method of studying these distant and faint objects, allowing us to gather essential information about their physical characteristics. (24835) 1995 SM55 is one of the few members of the Haumea orbital cluster and, therefore, is an especially relevant body to study within the TNO population. Aims. The main objectives of the present work are to determine the projected size, absolute magnitude, and geometric albedo of 1995 SM55 and to analyze the results compared to Haumea. Methods. We predicted a stellar occultation by this TNO for February, 25, 2024, carried out a specific campaign to observe the occultation, and derived the projected size and shape from the occultation observations using an elliptical fit to the occultation chords. We also analyzed a large set of photometric observations of (24835) 1995 SM55 to obtain the absolute magnitude and the rotational period. Finally, we combined these results to derive the geometric albedo of this TNO. Results. The occultation was successfully detected from seven instruments located at five different sites; 33 other sites reported negative detections. Using an elliptical fit to the occultation chords, we determined the size and shape of the limb of (24835) 1995 SM55 during the occultation: an ellipse with semi-axes (104.3 ± 0.4) × (83.5 ± 0.5) km. The area-equivalent diameter (Deq,A) for this ellipse is 186.7 ± 1.8 km. This is consistent with the upper limit of 250 km estimated from Herschel Observatory thermal data. From our photometric observations, we derived an absolute magnitude (HV ) of 4.55 ± 0.03, a phase slope parameter of 0.04 ± 0.02 mag/deg, and a V − R value of 0.37 ± 0.05. The rotational variability has a maximum peak-to-valley amplitude (∆m) of 0.05 mag, but we could not derive an unambiguous rotational period. Combining the projected size from the occultation with the absolute photometry, we obtained a geometric albedo in the V band (pV ) of 0.80 ± 0.04 for 1995 SM55. This value is remarkably high for a TNO and somewhat higher than that of Haumea, but consistent with the concept that 1995 SM55 is a member of the orbital cluster of Haumea. | |
| dc.description.sponsorship | This work was supported by multiple funding agencies and institutions. It was partly funded by the Spanish projects PID2020-112789GB I00 (AEI) and Proyecto de Excelencia de la Junta de Andalucía PY20-01309. J.L.O., P.S.-S., N.M., A.A.C. and R.D. acknowledge financial support from the Severo Ochoa grant CEX2021-001131-S (MCIN/AEI/10.13039/501100011033). P.S.-S. also acknowledges support from the Spanish I+D+i project PID2022- 139555NB-I00 (TNO-JWST) funded by MCIN/AEI/10.13039/501100011033. AAC acknowledges financial support from the project PID2023-153123NB-I00 funded by MCIN/AEI. Gy.M.Sz. acknowledges the SNN-147362, GINOP-2.3.2- 15-2016-00003, and K-138962 grants of the Hungarian Research, Development and Innovation Office (NKFIH). Z.G. acknowledges the PRODEX Experiment Agreement No. 4000137122 between ELTE Eötvös Loránd University and ESA, the VEGA grant No. 2/0031/22 of the Slovak Academy of Sciences, the Slovak Research and Development Agency contract No. APVV-20-0148, and support from the city of Szombathely. J.I.B.C. acknowledges CNPq grants 305917/2019- 6 and 306691/2022-1, and FAPERJ grant 201.681/2019. F.B.R. acknowledges CNPq grant 316604/2023-2. This study was financed in part by CAPES (Finance Code 001) and the National Institute of Science and Technology of the e-Universe project (INCT do e-Universo, CNPq grant 465376/2014-2). A. Takey and A.M. Abdelaziz acknowledge financial support from the Egyptian Science, Technology & Innovation Funding Authority (STDF) under grant 48102. M.A. acknowledges grants 427700/2018-3, 310683/2017-3, and 473002/2013-2. The work of A.S. and D.A.N. was supported by a grant of the Ministry of Research, Innovation and Digitalization (CCCDI -– UEFISCDI, project PN-IV-P6-6.3-SOL-2024-2-0220, within PNCDI IV). D.I. acknowledges funding provided by the University of Belgrade – Faculty of Mathematics through grant 451-03-136/2025-03/200104 from the Ministry of Science, Technological Development and Innovation of the Republic of Serbia. V.N. acknowledges support from the Bando Ricerca Fondamentale INAF 2023 Data Analysis Grant: “Characterization of transiting exoplanets by exploiting the unique synergy between TASTE and TESS”. Opera tion of the University of Haifa’s H80 telescope at the Wise Observatory is partly supported by ISF grant 3200/20. .IST60 and .IST40 are observational facilities of Istanbul University Observatory, funded by the Istanbul University Scientific Research Projects Coordination Unit (projects BAP-3685 and FBG-2017-23943) and by the Presidency of Strategy and Budget of the Republic of Türkiye (project 2016K12137). This work is partly based on observations collected at the Cen tro Astronómico Hispano en Andalucía (CAHA), Observatorio de Sierra Nevada (IAA-CSIC), and the Liverpool Telescope at the Roque de los Muchachos Obser vatory (IAC). This research has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), pro cessed by the Gaia Data Processing and Analysis Consortium (https://www. cosmos.esa.int/web/gaia/dpac/consortium), with funding provided by institutions participating in the Gaia Multilateral Agreement. The authors thank Peter C. Slansky and M. Krahn for their observational contribution, and grate fully acknowledge all observers who attempted to observe this occultation event but are not explicitly mentioned in Table A.1. They also thank their collabora tors at the University of Athens Observatory for utilizing the robotic Cassegrain reflector (see Gazeas (2016) for details). Bu çalışma, çeşitli fonlama kuruluşları ve kurumlar tarafından desteklenmiştir. Kısmen İspanyol projeleri PID2020-112789GB I00 (AEI) ve Proyecto de Excelencia de la Junta de Andalucía PY20-01309 tarafından finanse edilmiştir. J.L.O., P.S.-S., N.M., A.A.C. ve R.D., Severo Ochoa bursu CEX2021-001131-S (MCIN/AEI/10.13039/501100011033) tarafından sağlanan mali desteği kabul etmektedirler. P.S.-S. Ayrıca, MCIN/AEI/10.13039/501100011033 tarafından finanse edilen İspanyol I+D+i projesi PID2022- 139555NB-I00 (TNO-JWST)'den aldığı desteği de kabul etmektedir. AAC, MCIN/AEI tarafından finanse edilen PID2023-153123NB-I00 projesinden aldığı mali desteği kabul etmektedir. Gy.M.Sz., Macaristan Araştırma, Geliştirme ve İnovasyon Ofisi'nin (NKFIH) SNN-147362, GINOP-2.3.2- 15-2016-00003 ve K-138962 hibelerini kabul etmektedir. Z.G. PRODEX Deneyi'ni kabul eder. ELTE Eötvös Loránd Üniversitesi ve ESA arasındaki 4000137122 numaralı Anlaşmayı, Slovak Bilimler Akademisi'nin 2/0031/22 numaralı VEGA hibesini, Slovakya Araştırma ve Geliştirme Ajansı'nın APVV-20-0148 numaralı sözleşmesini ve Szombathely şehrinin desteğini kabul eder. J.I.B.C., CNPq'nun 305917/2019-6 ve 306691/2022-1 numaralı hibelerini ve FAPERJ'nin 201.681/2019 numaralı hibesini kabul eder. F.B.R., CNPq'nun 316604/2023-2 numaralı hibesini kabul eder. Bu çalışma kısmen CAPES (Finans Kod 001) ve e-Evren Ulusal Bilim ve Teknoloji Enstitüsü projesi (INCT do e-Universo, CNPq hibe 465376/2014-2) tarafından finanse edilmiştir. A. Takey ve A.M. Abdelaziz, Mısır Bilim, Teknoloji & İnovasyon Fonlama Kurumu'ndan (STDF) 48102 numaralı hibe kapsamında aldıkları mali desteği kabul etmektedirler. M.A., 427700/2018-3, 310683/2017-3 ve 473002/2013-2 numaralı hibeleri kabul etmektedir. A.S. ve D.A.N.'nin çalışmaları. Araştırma, İnovasyon ve Dijitalleşme Bakanlığı'nın (CCCDI - UEFISCDI, proje PN-IV-P6-6.3-SOL-2024-2-0220, PNCDI IV kapsamında) bir hibesiyle desteklenmiştir. D.I., Belgrad Üniversitesi - Matematik Fakültesi tarafından Sırbistan Cumhuriyeti Bilim, Teknolojik Gelişme ve İnovasyon Bakanlığı'ndan alınan 451-03-136/2025-03/200104 numaralı hibe ile sağlanan fonu kabul etmektedir. V.N., Bando Ricerca Fondamentale INAF 2023 Veri Analizi Hibesi'nden aldığı desteği kabul etmektedir: “TASTE ve TESS arasındaki benzersiz sinerjiden yararlanarak geçiş yapan ötegezegenlerin karakterizasyonu”. Haifa Üniversitesi'nin Wise Gözlemevi'ndeki H80 teleskobunun işletimi kısmen ISF 3200/20 numaralı hibe ile desteklenmektedir. .IST60 ve .IST40 gözlem tesisleridir İstanbul Üniversitesi Bilimsel Vakfı tarafından finanse edilen İstanbul Üniversitesi Gözlemevi'nin Araştırma Projeleri Koordinasyon Birimi (BAP-3685 ve FBG-2017-23943 projeleri) ve Türkiye Cumhuriyeti Strateji ve Bütçe Başkanlığı tarafından (proje 2016K12137). Bu çalışma kısmen Cen tro Astronómico Hispano en Andalucía (CAHA), Observatorio de Sierra Nevada'da toplanan gözlemlere dayanmaktadır. (IAA-CSIC) ve Roque de los Muchachos Gözlemevi'ndeki (IAC) Liverpool Teleskobu. Bu araştırma, Avrupa Uzay Ajansı (ESA) Gaia misyonundan (https://www.cosmos.esa.int/gaia) elde edilen ve Gaia Veri İşleme ve Analiz Konsorsiyumu (https://www.cosmos.esa.int/web/gaia/dpac/consortium) tarafından işlenen verilerden yararlanmıştır ve Gaia Çok Taraflı Anlaşmasına katılan kurumlar tarafından finanse edilmiştir. Yazarlar, gözlemsel katkılarından dolayı Peter C. Slansky ve M. Krahn'a teşekkür eder ve bu örtülme olayını gözlemlemeye çalışan ancak Tablo A.1'de açıkça belirtilmeyen tüm gözlemcilere minnettar olduklarını belirtirler. Ayrıca, robotik Cassegrain reflektörünü kullandıkları için Atina Üniversitesi Gözlemevi'ndeki işbirlikçilerine de teşekkür ederler (ayrıntılar için Gazeas (2016)'ya bakınız). | |
| dc.identifier.citation | Ortiz, J. L., Morales Palomino, N. F., Sicardy, B., Rommel, F. L., Braga Ribas, F., Kılıç, Y., Fernández-Valenzuela, E., Rizos García, J. L., Solmaz, A., & Morgado, B. (2025). A high geometric albedo and small size for the haumea cluster member (24835) 1995 SM55 determined from a stellar occultation and photometric observations. Astronomy & Astrophysics, 703, pp. 1-13. https://doi.org/10.1051/0004-6361/202556498 | |
| dc.identifier.doi | 10.1051/0004-6361/202556498 | |
| dc.identifier.endpage | 13 | |
| dc.identifier.issn | 0004-6361 | |
| dc.identifier.issn | 1432-0746 | |
| dc.identifier.scopus | 2-s2.0-105021965743 | |
| dc.identifier.scopusquality | Q1 | |
| dc.identifier.startpage | 1 | |
| dc.identifier.uri | https://doi.org/10.1051/0004-6361/202556498 | |
| dc.identifier.uri | https://hdl.handle.net/20.500.13055/1229 | |
| dc.identifier.volume | 703 | |
| dc.identifier.wos | WOS:001626464600017 | |
| dc.identifier.wosquality | Q1 | |
| dc.indekslendigikaynak | Web of Science | |
| dc.indekslendigikaynak | Scopus | |
| dc.indekslendigikaynak | PubMed | |
| dc.indekslendigikaynak.other | SCI-E - Science Citation Index Expanded | |
| dc.institutionauthor | Solmaz, Arif | |
| dc.institutionauthorid | 0000-0002-3076-164X | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.relation.ispartof | Astronomy & Astrophysics | |
| dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.subject | Occultations – Kuiper Belt | |
| dc.subject | General – Kuiper Belt Objects | |
| dc.subject | Individual | |
| dc.subject | (24835) 1995 SM55 | |
| dc.title | A high geometric albedo and small size for the haumea cluster member (24835) 1995 SM55 determined from a stellar occultation and photometric observations | |
| dc.type | Article | |
| dspace.entity.type | Publication |
