Astronomy:Jupiter LXVIII
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| File:2017 J 7 DECam 2017-03-23 annotated.gif Discovery images of Jupiter LXVIII from the Cerro Tololo Observatory's Dark Energy Camera on 23 March 2017 | |
| Discovery | |
|---|---|
| Discovered by | Scott Sheppard et al. |
| Discovery date | 2017 |
| Designations | |
Designation | Jupiter LXVIII |
| S/2017 J 7 | |
| Orbital characteristics[3] | |
| Epoch 2026-01-01 | |
| Observation arc | 1 year 2018-05-17 (last obs)[1] |
| |{{{apsis}}}|apsis}} | 17.1 million km |
| |{{{apsis}}}|apsis}} | 25.7 million km (2026-May-21)[2] |
| 20.2 million km | |
| Eccentricity | 0.193 |
| Orbital period | −632.3 days |
| Mean anomaly | 82° |
| Inclination | 144.6° |
| Longitude of ascending node | 347° |
| 336° | |
| Satellite of | Jupiter |
| Group | Ananke group |
| Physical characteristics | |
| Mean diameter | 2 km[4] |
| Apparent magnitude | 23.6 |
| Absolute magnitude (H) | 16.6 (18 obs)[1] |
Jupiter LXVIII, provisionally known as S/2017 J 7, is an outer natural satellite of Jupiter. It was discovered by Scott S. Sheppard and his team in 2017, but not announced until July 17, 2018, via a Minor Planet Electronic Circular from the Minor Planet Center.[5] It is about 2 kilometers in diameter[4] and orbits at a semi-major axis of about 20.2 million km with an inclination of about 144.6°. It belongs to the Ananke group.
It only has a 1 1⁄4 year observation arc with 18 observations. It will next come to apojove (farthest distance from Jupiter) on 21 May 2026 when it will be 0.166 astronomical unit|AU (24.8 million km; 15.4 million mi) from Jupiter.[2]
References
- ↑ 1.0 1.1 MPC Natural Satellites (Select: Orbital Elements)
- ↑ 2.0 2.1 "Apojove on 2026-May-21". JPL Horizons. https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272017J7%27&START_TIME=%272026-05-21%2012:00%27&STOP_TIME=%272026-05-22%27&STEP_SIZE=%271%20hour%27&QUANTITIES=%2720%27&CENTER=%27@599%27. Retrieved 2026-02-17.
- ↑ Horizons output. "Jovian Osculating Orbital Elements for 2017J7 (568)". https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272017J7%27&TABLE_TYPE=%27ELEMENTS%27&START_TIME=%272026-01-01%27&STOP_TIME=%272026-01-02%27&STEP_SIZE=%271%20year%27&CENTER=%27@599%27&OUT_UNITS=%27KM-D%27.
- ↑ 4.0 4.1 S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
- ↑ "MPEC 2018-O15 : S/2017 J 7". International Astronomical Union. https://minorplanetcenter.net/mpec/K18/K18O15.html.
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