 Rumina imaged by theHubble 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) |
| Earliestprecovery 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 |
| 888.36yr (324475±19d) | |
| 8.226° | |
| 0° 0m 3.994s / day | |
| Inclination | 28.6976° |
| 84.629° | |
| 318.672° | |
| Knownsatellites | 0 |
| Physical characteristics | |
| ≈644 km(derived from occultation; 455 and 460 km measured)[3] 524+96 −103 km[4] | |
Meandensity | >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 designation2005 RM43) is a largetrans-Neptunian object in thescattered disc region beyond theKuiper belt. It was discovered on 9 September 2005, by American astronomersAndrew Becker,Andrew Puckett andJeremy Kubica atApache Point Observatory in Sunspot, New Mexico. It measures approximately 600 kilometers in diameter.
Rumina was discovered by astronomersAndrew Becker,Andrew Puckett andJeremy Kubica on 9 September 2005, during observations for theSloan Digital Sky Survey.[9][10] The discovery observations were made using the 2.5-meter telescope atApache Point Observatory inSunspot, New Mexico.[10] The discoverers further observed Rumina until November 2005 and found the object inprecovery observations from dates as early as October 1999.[10] The discovery of Rumina was announced by theMinor Planet Center on 23 July 2006.[10] Since then, Rumina has been found in even earlier precovery observations dating back to November 1976.[9]
The object is named afterRumīna, aRoman goddess who protected nursing mothers.[11]: 7 The naming of this object was announced by theInternational Astronomical Union'sWorking Group for Small Body Nomenclature on 1 September 2025.[11]: 24 Before Rumina was officially named, it was known by itsprovisional designation2005 RM43,[9] which indicates the year and half-month of the object's discovery date.[12] Rumina'sminor planet catalog number of 145451 was given by the Minor Planet Center on 5 December 2006.[13] TheKuiper belt objects145452 Ritona and(145453) 2005 RR43 directly come after Rumina's number in the minor planet catalog.[13]
In 2018, twostellar occultations by Rumina were observed on 3 February and 24 December.[3] The February occultation yielded a singlechord 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]
Rumina is a minor Roman goddess who was invoked as a protector of nursing mothers.
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