58534 Logos

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58534 Logos
Discovered by C. A. Trujillo,
J. Chen,
D. C. Jewitt,
J. X. Luu
Discovery date February 4, 1997
MPC designation 58534 Logos
Pronunciation /ˈlɡɒs/ LOH-goss or /ˈlɒɡɒs/ LOG-oss
Named after
1997 CQ29
Adjectives Logian
Orbital characteristics[3]
Epoch August 27, 2011 (JD 2455800.5)
Aphelion 50.50 AU
Perihelion 39.675 AU
45.09 AU
Eccentricity 0.1201
302.8 a (110589 d)
4.41 km/s
Inclination 2.9015°
Known satellites Zoe[2]
(~66 km in diameter)
Physical characteristics
Dimensions 77 ± 18 km[4]
Mass 2.7×1017 kg
Mean density
1.0 g/cm³
0.0112 m/s²
0.0299 km/s
Albedo 0.39 ± 0.17[4]

58534 Logos (/ˈlɡɒs/ LOH-goss or /ˈlɒɡɒs/ LOG-oss; or as in Greek: λόγος) is a small Kuiper-belt object, more specifically a cubewano, notable for having a comparatively large satellite named Zoe. For a small KBO, about 80 km in diameter, it has a very high albedo.[4] The system mass is 4.58 ± 0.07×1017 kg.[5]

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


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 was discovered on 17 November 2001 from Hubble Space Telescope observations by K. S. Noll, D. C. Stephens, W. M. Grundy, J. Spencer, R. L. Millis]], M. W. Buie, D. 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 Greek: Ζωή). It orbits Logos with a semi-major axis of 8217 ± 42 km in 309.9 ± 0.2 d with an eccentricity of 0.546 ± 0.008.[5] Its estimated diameter is 66 km,[2] and mass (0.15 ± 0.02)×1018 kg.


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


  1. ^ Marc W. Buie (2003-05-31). "Orbit Fit and Astrometric record for 58534". SwRI (Space Science Department). Retrieved 2008-09-28. 
  2. ^ a b Wm. Robert Johnston (2007-03-04). "(58534) Logos and Zoe". Johnston's Archive. Retrieved 2009-10-06. 
  3. ^ JPL Small-Body Database Browser
  4. ^ 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.  (Preprint on arXiv.)
  5. ^ 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.  edit

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