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58534 Logos

Binary Kuiper belt object

Field	Value
minorplanet	yes
background	#C2E0FF
name	58534 Logos
image	File:logos-zoe-hst.jpg
caption	Logos and its companion Zoe imaged by the Hubble Space Telescope in 2004
discoverer	Mauna Kea Obs. (team disc.)
discovery_site	Mauna Kea Obs.
discovered	4 February 1997
mpc_name	(58534) Logos
pronounced	or
adjectives	Logian
alt_names
named_after	Logos
(Aeon in Ptolemy Gnostics)
mp_category	TNOcubewano
cold
orbit_ref
epoch	13 January 2016 (JD 2457400.5)
observation_arc	5582 days (15.28 yr)
uncertainty	3
semimajor	45.549 AU
perihelion	39.945 AU
aphelion	51.153 AU
eccentricity	0.12304
period	307.42 yr (112284 d)
inclination	2.8946°
asc_node	132.491°
arg_peri	339.21°
mean_anomaly	56.495°
mean_motion	/ day
satellites	Zoe (est. D: 66 km)
mean_diameter
mass
density	1.0 g/cm3
rotation	(orbital period of inner binary)
albedo	0.39 ± 0.17
abs_magnitude	6.6

(Aeon in Ptolemy Gnostics) cold

58534 Logos, or as a binary system (58534) Logos–Zoe (provisional designation ****), is a likely trans-Neptunian contact binary or close-binary triple system in the cold classical population of the Kuiper belt. The contact binary is approximately 77 km in diameter. and has a 66-kilometer (41 miles) companion named Zoe. The system mass is .

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

Hubble Space Telescope observations of variations in brightness that indicate that Logos itself is likely a close binary or contact binary. It rotates with a period of 17.4 hours.

Orbit

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 or further than 52.1 AU.

Zoe

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

The Logos system was discovered on 4 February 1997, and it was discovered to be a binary object 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.

Once the secondary was confirmed, it was officially designated (58534) Logos I and named Zoe. It orbits its primary Logos with a semi-major axis of 8217 km in 309.9 days with an eccentricity of 0.546. Its estimated diameter is 66 km, and mass is (0.15 ± 0.02) kg.

Zoe potentially has a very slow rotation. , its shape is unknown.

References

|author-link=Marc W. Buie

|access-date=17 February 2018}}

References

{{OED. Logian
"58534 Logos (1997 CQ29)". [[NASA]]/[[Jet Propulsion Laboratory]].
(2005). "Diverse albedos of small trans-neptunian objects". Icarus.
(2011). "Five new and three improved mutual orbits of transneptunian binaries". Icarus.
Wm. Robert Johnston. (4 March 2007). "(58534) Logos and Zoe". Johnston's Archive.
(June 2025). "Logos-Zoe: A Contact Binary Triple System in the Trans-Neptunian Belt". [[The Astronomical Journal]].

Info: Wikipedia Source

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