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145451 Rumina
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 Rumina imaged by the Hubble Space Telescope on 2 November 2008 | |
| Discovery[1] | |
|---|---|
| Discovered by | A. C. Becker A. W. Puckett J. M. Kubica |
| Discovery site | Apache Point Obs. |
| Discovery date | 9 September 2005 |
| Designations | |
| (145451) Rumina | |
| Pronunciation | /ruːˈmaɪnə/ |
Named after | Rumīna |
| 2005 RM43 | |
| SDO[2] | |
| Orbital characteristics[1] | |
| Epoch 2025 May 05 (JD 2460800.5) | |
| Uncertainty parameter 1 | |
| Observation arc | 48.18 yr (17,596 d) |
| Earliest precovery date | 17 November 1976 |
| Aphelion | 149.67 AU (22.390 Tm) |
| Perihelion | 35.147 AU (5.2579 Tm) |
| 92.41 AU (13.824 Tm) | |
| Eccentricity | 0.6197 |
| 888.36 yr (324475±19 d) | |
| 8.226° | |
| 0° 0m 3.994s / day | |
| Inclination | 28.6976° |
| 84.629° | |
| 318.672° | |
| Known satellites | 0 |
| Physical characteristics | |
| ≈644 km (derived from occultation; 455 and 460 km measured)[3] 524+96 −103 km[4] | |
Mean density | >0.56 g/cm3[2] |
| 6.71 h (0.280 d) | |
| 0.102[4] | |
| V–R=0.33±0.02 (neutral)[4] B0−V0=0.590[5] B-R=0.99[2] | |
| 20.4[6] | |
| 4.52±0.01[4] 4.4[1] · 4.8[7] | |
145451 Rumina (provisional designation 2005 RM43) is a large trans-Neptunian object in the scattered disc region beyond the Kuiper belt. It was discovered on 9 September 2005, by American astronomers Andrew Becker, Andrew Puckett and Jeremy Kubica at Apache Point Observatory in Sunspot, New Mexico. It measures approximately 600 kilometers in diameter.
History
[edit]Discovery
[edit]Rumina was discovered by astronomers Andrew Becker, Andrew Puckett and Jeremy Kubica on 9 September 2005, during observations for the Sloan Digital Sky Survey.[8][9] The discovery observations were made using the 2.5-meter telescope at Apache Point Observatory in Sunspot, New Mexico.[9] The discoverers further observed Rumina until November 2005 and found the object in precovery observations from dates as early as October 1999.[9] The discovery of Rumina was announced by the Minor Planet Center on 23 July 2006.[9] Since then, Rumina has been found in even earlier precovery observations dating back to November 1976.[8]
Name and number
[edit]The object is named after Rumīna, a Roman goddess who protected nursing mothers.[10]: 7 The naming of this object was announced by the International Astronomical Union's Working Group for Small Body Nomenclature on 1 September 2025.[10]: 24 Before Rumina was officially named, it was known by its provisional designation 2005 RM43,[8] which indicates the year and half-month of the object's discovery date.[11] Rumina's minor planet catalog number of 145451 was given by the Minor Planet Center on 5 December 2006.[12] The Kuiper belt objects 145452 Ritona and (145453) 2005 RR43 directly come after Rumina's number in the minor planet catalog.[12]
Description
[edit]In 2018, two stellar occultations by Rumina were observed on 3 February and 24 December.[3] The February occultation yielded a single chord length of 456 km (283 mi).[13] Observations of the December occultation yielded two positive chords, which together suggest an approximate diameter of 644 km (400 mi).[14]
References
[edit]- ^ a b c "JPL Small-Body Database Browser: 145451 Rumina (2005 RM43)" (2025-01-20 last obs). Retrieved August 19, 2025.
- ^ a b c Wm. Robert Johnston. "List of Known Trans-Neptunian Objects". Johnston's Archive. Archived from the original on 2 February 2019. Retrieved 2 February 2019.
- ^ a b "TNO Results". ERC Lucky Star Project. Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA). Retrieved 13 July 2020.
- ^ a b c d Farkas-Takács, A.; Kiss, Cs.; Vilenius, E.; Marton, G.; Müller, T. G.; Mommert, M.; et al. (28 February 2020). "TNOs are Cool! A Survey of the transneptunian Region XV. Physical characteristics of 23 resonant transneptunian and scattered disk objects". Astronomy & Astrophysics. A23: 638. arXiv:2002.12712. Bibcode:2020A&A...638A..23F. doi:10.1051/0004-6361/201936183. S2CID 216193564.
- ^ David L. Rabinowitz; Bradley E. Schaefer; Martha W. Schaefer; Suzanne W. Tourtellotte (2008). "The Youthful Appearance of the 2003 EL61 Collisional Family". The Astronomical Journal. 136 (4): 1502–1509. arXiv:0804.2864. Bibcode:2008AJ....136.1502R. doi:10.1088/0004-6256/136/4/1502. S2CID 117167835.
- ^ AstDyS. "(145451) 2005RM43 – Observation prediction". Department of Mathematics, University of Pisa. Retrieved 2 February 2019.
- ^ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Archived from the original on 2 February 2019. Retrieved 2 February 2019.
- ^ a b c "(145451) Rumina = 2005 RM43". Minor Planet Center. Retrieved 2 February 2019.
- ^ a b c d Becker, A. C.; Puckett, A. W.; Kubika, J.; Williams, G. V. (2006-07-23). "MPEC 2006-O24 : 2005 RM43". Minor Planet Electronic Circular. 2006-O25. Minor Planet Center. Bibcode:2006MPEC....O...24B. Retrieved 2025-09-01.
- ^ a b "(145451) Rumina = 2005 RM43" (PDF). WGSBN Bulletin. 5 (20). International Astronomical Union: 7.
Rumina is a minor Roman goddess who was invoked as a protector of nursing mothers.
- ^ "New- And Old-Style Minor Planet Designations". Minor Planet Center. Retrieved 2025-09-01.
- ^ a b "M.P.C. 58206" (PDF). Minor Planet Circulars (58206). Minor Planet Center: 160. 2006-12-05. Retrieved 2025-09-01.
- ^ "Occultation by 2005 RM43 in 03 02 2018" (PDF). ERC Lucky Star Project. Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA). 3 February 2018. Retrieved 13 July 2020.
- ^ "Occultation by 2005 RM43 in 23 DEC 2018" (PDF). ERC Lucky Star Project. Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA). 24 December 2018. Retrieved 13 July 2020.
External links
[edit]
- (145451) 2005 RM43 Precovery Images
- 145451 Rumina at AstDyS-2, Asteroids—Dynamic Site
- 145451 Rumina at the JPL Small-Body Database
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