 Logos and its companion Zoe imaged by theHubble Space Telescope in 2004 | |
| Discovery | |
|---|---|
| Discovered by | Mauna Kea Obs.(team disc.) |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 4 February 1997 |
| Designations | |
| (58534) Logos | |
| Pronunciation | /ˈloʊɡɒs/ or/ˈlɒɡɒs/ |
Named after | Logos[1] (Aeon inPtolemy Gnostics) |
| 1997 CQ29 | |
| TNO[1] · cubewano[2] cold[3] | |
| Adjectives | Logian/ˈlɒdʒiən/[4] |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 5582 days (15.28 yr) |
| Aphelion | 51.153 AU (7.6524 Tm) |
| Perihelion | 39.945 AU (5.9757 Tm) |
| 45.549 AU (6.8140 Tm) | |
| Eccentricity | 0.12304 |
| 307.42yr (112284d) | |
| 56.495° | |
| 0° 0m 11.542s / day | |
| Inclination | 2.8946° |
| 132.491° | |
| 339.21° | |
| Knownsatellites | Zoe(est.D: 66 km)[5] |
| Physical characteristics | |
| 77±18 km[6] | |
| Mass | 2.7×1017 kg |
Meandensity | 1.0 g/cm3[7] |
| 17.43±0.06 hr (orbital period of inner binary)[7] | |
| 0.39 ± 0.17[6] | |
| 6.6[1] | |
58534 Logos, or as a binary system(58534) Logos–Zoe[8] (provisional designation1997 CQ29), is a likely trans-Neptuniancontact binary or close-binarytriple system in thecold classical population of theKuiper belt.[7] The contact binary is approximately 77 kilometers (48 miles) in diameter. and has a 66-kilometer (41 miles)companion named Zoe.[6] The system mass is(4.58±0.07)×1017 kg.[8]
In theGnostic tradition,Logos andZoe are a paired emanation of the deity, and part of its creation myth.[1]
Hubble Space Telescope observations of variations in brightness that indicate that Logos itself is likely a close binary orcontact binary. It rotates with a period of 17.4 hours.[7]
A 10-million-year integration of the orbit shows that it is aclassical 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]
 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. | |
| Discovery | |
|---|---|
| Discovered by | Keith S. Nollet al. |
| Discovery date | 17 November 2001 |
| Designations | |
| Pronunciation | /ˈzoʊ.iː/ |
Named after | Zoe (Ζωή) |
| (58534) Logos I | |
| Adjectives | Zoean/zoʊˈiːən/) |
| Orbital characteristics[8] | |
| 8217±42 km | |
| Eccentricity | 0.5463±0.0079 |
| 309.87±0.22 d | |
| Satellite of | Logos |
| Physical characteristics[5] | |
| Dimensions | 66 km |
| Mass | (1.5±0.2)×1017 kg |
Logos is abinary with the components of comparable size orbiting thebarycentre 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 fromHubble Space Telescope observations byK. 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 namedZoe. It orbits its primary Logos with a semi-major axis of 8217 km in 309.9 days with aneccentricity of 0.546.[8] Its estimated diameter is 66 km,[5] and mass is (0.15 ± 0.02)×1018 kg.
Zoe potentially has a very slow rotation. As of 2025[update], its shape is unknown.[7]
