145451 Rumina

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145451 Rumina
145451-2005rm43.jpg
Hubble Space Telescope image of Rumina taken in 2008
Discovery [1]
Discovered by A. C. Becker
A. W. Puckett
J. M. Kubica
Discovery site Apache 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 arc 48.18  yr (17,596 d)
Earliest precovery date17 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°
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 that resides 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.

    Contents

    Description

    Precovery image of Rumina taken by the Siding Spring Observatory in 1976 2005rm43-19761117.gif
    Precovery image of Rumina taken by the Siding Spring Observatory in 1976

    Rumina has been observed 548 times, with precovery images dating back to 1976. [1] [9] The orbit is well determined with an uncertainty parameter of 1. [1]

    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). [10] Observations of the December occultation yielded two positive chords, which together suggest an approximate diameter of 644 km (400 mi). [11]

    Naming

    Rumina was named on 1 September 2025, after the Roman goddess Rumīna. [12]

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 145451 (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. ↑ "(145451) = 2005 RM43". Minor Planet Center. Retrieved 2 February 2019.
    10. ↑ "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.
    11. ↑ "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.
    12. ↑ "(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.
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