(145451) 2005 RM43
 Hubble Space Telescope image of 2005 RM43 taken in 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) 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° | |
| 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) 2005 RM43 (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.
Description
2005 RM43 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 2005 RM43 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]
References
- ^ a b c d e "JPL Small-Body Database Browser: 145451 (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.
- ^ Lowe, Andrew. "(145451) 2005 RM43 Precovery Images". andrew-lowe.ca.
- ^ "(145451) = 2005 RM43". Minor Planet Center. Retrieved 2 February 2019.
- ^ "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.