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58534 Logos

58534 Logos
Discovered byMauna Kea Obs. (team disc.)
Discovery siteMauna Kea Obs.
Discovery date4 February 1997
MPC designation(58534) Logos
Pronunciation/ˈlɡɒs/ LOH-goss
or /ˈlɒɡɒs/ LOG-oss
Named after
(Aeon in Ptolemy Gnostics)
1997 CQ29
TNO[1] · cubewano[2]
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc5582 days (15.28 yr)
Aphelion51.153 AU (7.6524 Tm)
Perihelion39.945 AU (5.9757 Tm)
45.549 AU (6.8140 Tm)
307.42 yr (112284 d)
0° 0m 11.542s / day
Known satellitesZoe (est. D: 66 km)[4]
Physical characteristics
Mean diameter
77±18 km[5]
Mass2.7×1017 kg
Mean density
1.0 g/cm³
0.39 ± 0.17[5]

58534 Logos (/ˈlɡɒs/ LOH-goss or /ˈlɒɡɒs/ LOG-oss; from Greek λόγος) is a trans-Neptunian object and binary system from the classical Kuiper belt, approximately 77 kilometers (48 miles). The bright cubewano belonged to the cold population and has a 66-kilometer sized companion named Zoe.[5] The system mass is (4.58±0.07)×1017 kg.[6]

In the Gnostic tradition, Logos and Zoe are a paired emanation of the deity, and part of its creation myth.[1]


Two bodies with similar mass orbiting around a common barycenter (red cross) with elliptic orbits. The interaction of Logos and Zoe is similar to this.

Logos is a binary with the components of comparable size orbiting the barycentre on a moderately elliptical orbit.

Logos' companion, Zoe, was discovered on 17 November 2001 from Hubble Space Telescope observations by K. S. Noll, D. C. Stephens, W. M. Grundy, J. Spencer, Robert Millis, Marc Buie, Dale Cruikshank, S. C. Tegler, and W. Romanishin and announced on 11 February 2002.

After the discovery, it received the provisional designation S/2001 (58534) 1. Once confirmed it was officially named (58534) Logos I Zoe (/ˈz./; from Ζωή). It orbits Logos with a semi-major axis of 8217 km in 309.9 days with an eccentricity of 0.546.[6] Its estimated diameter is 66 km,[4] and mass (0.15 ± 0.02)×1018 kg.


A 10-million-year integration of the orbit shows that it is a Classical Kuiper belt object that does not get closer to the Sun than 38.8 AU (5.80 billion km) or further than 52.1 AU.[2]

Orbit of Logos (grey object) compared with Pluto (orange) and Neptune (blue)


  1. ^ a b c d e "58534 Logos (1997 CQ29)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 April 2016.
  2. ^ a b Marc W. Buie (31 May 2003). "Orbit Fit and Astrometric record for 58534". SwRI (Space Science Department).
  3. ^ Brown, Mike. "How many dwarf planets are there in the Solar System". Retrieved 17 February 2018.
  4. ^ a b Wm. Robert Johnston (4 March 2007). "(58534) Logos and Zoe". Johnston's Archive.
  5. ^ a b c Grundy, W. M; Noll, K. S.; Stephens, D. C. (2005). "Diverse albedos of small trans-neptunian objects". Icarus. 176 (1): 184–191. arXiv:astro-ph/0502229. Bibcode:2005Icar..176..184G. doi:10.1016/j.icarus.2005.01.007.
  6. ^ a b Grundy, W. M.; Noll, K. S.; Nimmo, F.; Roe, H. G.; Buie, M. W.; Porter, S. B.; Benecchi, S. D.; Stephens, D. C.; Levison, H. F.; Stansberry, J. A. (2011). "Five new and three improved mutual orbits of transneptunian binaries" (PDF). Icarus. 213 (2): 678. arXiv:1103.2751. Bibcode:2011Icar..213..678G. doi:10.1016/j.icarus.2011.03.012.

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