47171 Lempo
System comprising three trans-Neptunian objects / From Wikipedia, the free encyclopedia
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47171 Lempo, or as a binary (47171) Lempo–Hiisi (provisional designation 1999 TC36), is a trans-Neptunian object and trinary system from the Kuiper belt, located in the outermost regions of the Solar System. It was discovered on 1 October 1999, by American astronomers Eric Rubenstein and Louis-Gregory Strolger during an observing run at Kitt Peak National Observatory in Arizona, United States.[2][11] Rubenstein was searching images taken by Strolger as part of their Nearby Galaxies Supernova Search project. It is classified as a plutino with a 2:3 mean-motion resonance with Neptune and is among the brighter TNOs. It reached perihelion in July 2015. This minor planet was named after Lempo from Finnish mythology.[2]
Discovery[1] | |
---|---|
Discovered by | Eric P. Rubenstein Louis-Gregory Strolger |
Discovery site | Kitt Peak National Obs. |
Discovery date | 1 October 1999 |
Designations | |
(47171) Lempo | |
Pronunciation | /ˈlɛmpoʊ/[citation needed] |
Named after | Lempo (Finnish mythology) [2] |
1999 TC36 | |
TNO · plutino[3] · distant[2] · trinary[4] | |
Orbital characteristics[1] | |
Epoch 17 December 2020 (JD 2459200.5) | |
Uncertainty parameter 1 | |
Observation arc | 46.58 yr (17,013 days) |
Earliest precovery date | 18 June 1974 |
Aphelion | 48.397 AU |
Perihelion | 30.542 AU |
39.470 AU | |
Eccentricity | 0.22618 |
247.97 yr (90,572 days) | |
8.547° | |
0° 0m 14.309s / day | |
Inclination | 8.4233° |
97.020° | |
294.424° | |
Known satellites | 2 |
Physical characteristics | |
Mean diameter | 272+17 −19 km (primary)[5] |
Mass | (12.75±0.06)×1018 kg (overall system)[4] (14.20±0.05)×1018 kg (without Paha)[4] 6.71×1018 kg (primary)[6] |
Mean density | 0.64+0.15 −0.11 g/cm3 (system)[5] |
0.079+0.013 −0.011 (system)[5] | |
RR (very red)[7][8] B–V=1.029±0.047[9] V−R=0.693±0.032[9] V−I=1.270±0.050[9] | |
19.9[10] | |
5.41±0.10[5] 4.8 (assumed)[1] | |
The trinary system's other two components, Paha /ˈpɑːhɑː/ and Hiisi /ˈhiːsi/, were discovered in 2001 and 2007, respectively, and later named after Lempo's two demon cohorts, Paha and Hiisi.[12]