145451 Rumina

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Wikipedia

145451 Rumina
Rumina imaged by the Hubble Space Telescope on 2 November 2008
Discovery[1]
Discovered byA. C. Becker
A. W. Puckett
J. M. Kubica
Discovery siteApache Point Obs.
Discovery date9 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 arc48.18 yr (17,596 d)
Earliest precovery date17 November 1976
Aphelion149.67 AU (22.390 Tm)
Perihelion35.147 AU (5.2579 Tm)
92.41 AU (13.824 Tm)
Eccentricity0.6197
888.36 yr (324475±19 d)
8.226°
0° 0m 3.994s / day
Inclination28.6976°
84.629°
318.672°
Known satellites0
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

    Discovery

    Precovery image of Rumina taken by the Siding Spring Observatory in 1976[8]

    Rumina was discovered by astronomers Andrew Becker, Andrew Puckett and Jeremy Kubica on 9 September 2005, during observations for the Sloan Digital Sky Survey.[9][10] The discovery observations were made using the 2.5-meter telescope at Apache Point Observatory in Sunspot, New Mexico.[10] The discoverers further observed Rumina until November 2005 and found the object in precovery observations from dates as early as October 1999.[10] The discovery of Rumina was announced by the Minor Planet Center on 23 July 2006.[10] Since then, Rumina has been found in even earlier precovery observations dating back to November 1976.[9]

    Name and number

    The object is named after Rumīna, a Roman goddess who protected nursing mothers.[11]: 7  The naming of this object was announced by the International Astronomical Union's Working Group for Small Body Nomenclature on 1 September 2025.[11]: 24  Before Rumina was officially named, it was known by its provisional designation 2005 RM43,[9] which indicates the year and half-month of the object's discovery date.[12] Rumina's minor planet catalog number of 145451 was given by the Minor Planet Center on 5 December 2006.[13] The Kuiper belt objects 145452 Ritona and (145453) 2005 RR43 directly come after Rumina's number in the minor planet catalog.[13]

    Description

    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).[14] Observations of the December occultation yielded two positive chords, which together suggest an approximate diameter of 644 km (400 mi).[15]

    References

    1. 1 2 3 "JPL Small-Body Database Browser: 145451 Rumina (2005 RM43)" (2025-01-20 last obs). Retrieved August 19, 2025.
    2. 1 2 3 Wm. Robert Johnston. "List of Known Trans-Neptunian Objects". Johnston's Archive. Archived from the original on 2 February 2019. Retrieved 2 February 2019.
    3. 1 2 "TNO Results". ERC Lucky Star Project. Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA). Retrieved 13 July 2020.
    4. 1 2 3 4 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.
    5. ↑ 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.
    6. ↑ AstDyS. "(145451) 2005RM43 – Observation prediction". Department of Mathematics, University of Pisa. Retrieved 2 February 2019.
    7. ↑ 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.
    8. ↑ Lowe, Andrew. "(145451) 2005 RM43 Precovery Images". andrew-lowe.ca.
    9. 1 2 3 "(145451) Rumina = 2005 RM43". Minor Planet Center. Retrieved 2 February 2019.
    10. 1 2 3 4 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.
    11. 1 2 "(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.
    12. ↑ "New- And Old-Style Minor Planet Designations". Minor Planet Center. Retrieved 2025-09-01.
    13. 1 2 "M.P.C. 58206" (PDF). Minor Planet Circulars (58206). Minor Planet Center: 160. 2006-12-05. Retrieved 2025-09-01.
    14. ↑ "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.
    15. ↑ "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.