S/2003 J 2

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S/2003 J 2
2003 J 2 Gladman CFHT annotated.gif
S/2003 J 2 imaged by the Canada-France-Hawaii Telescope during follow-up observations in February 2003
Discovery  [1]
Discovered by Scott S. Sheppard et al.
Discovery site Mauna Kea Obs.
Discovery date5 February 2003
Orbital characteristics   [2]
Epoch 17 December 2020 (JD 2459200.5)
Observation arc 16.42 yr (5,996 d)
Earliest precovery date11 December 2001
0.1373976  AU (20,554,390 km)
Eccentricity 0.2776569
–1.65 yr (–602.02 d)
114.43587°
0° 35m 52.742s / day
Inclination 149.20392° (to ecliptic)
50.46976°
224.95527°
Satellite of Jupiter
Group Ananke group
Physical characteristics
Mean diameter
≈2 km [3]
Albedo 0.04 (assumed) [3]
23.2 [3]
16.7 [2]

    S/2003 J 2 is a retrograde irregular satellite of Jupiter. The moon was discovered on 5 February 2003 by a team of astronomers from the University of Hawaii led by Scott S. Sheppard and David C. Jewitt, and was later announced on 4 March 2003. [4] [5] It was initially thought to be Jupiter's outermost known moon until recovery observations disproved this in 2020. [6]

    S/2003 J 2 is about 2 km (1.2 mi) in diameter, and orbits Jupiter at an average distance of about 20,600,000 kilometers (20.6 gigametres (0.138  AU )) in roughly 600 days, at an inclination of around 149° to the ecliptic and with an eccentricity of 0.28. The moon was initially assumed to be part of the Pasiphae group, but is now known to be part of the Ananke group after it was recovered in 2020. [1] [6]

    S/2003 J 2 and several bright background stars and galaxies imaged by the CFHT in April 2003 2003 J 2 CFHT 2003-04-30.gif
    S/2003 J 2 and several bright background stars and galaxies imaged by the CFHT in April 2003

    The moon was considered lost [7] [8] [9] [10] until 2020, when it was recovered by Sheppard and independently by amateur astronomer Kai Ly. [6] The recovery of the moon was announced by the Minor Planet Center on 26 January 2021. [2]

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    <span class="mw-page-title-main">S/2003 J 4</span> Moon of Jupiter

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    Eirene, also Jupiter LVII and originally known as S/2003 J 5, is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003 but was then lost. It was recovered in 2017 and given its permanent designation that year.

    <span class="mw-page-title-main">S/2003 J 9</span> Moon of Jupiter

    S/2003 J 9 is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003.

    <span class="mw-page-title-main">S/2003 J 10</span> Moon of Jupiter

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    <span class="mw-page-title-main">S/2003 J 12</span>

    S/2003 J 12 is a natural satellite of Jupiter, and is one of the smallest known natural satellites in the Solar System. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003.

    Philophrosyne, also Jupiter LVIII and provisionally known as S/2003 J 15, is a natural satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard, et al. in 2003, but then lost. It was recovered in 2017 and given its permanent designation that year.

    <span class="mw-page-title-main">S/2003 J 16</span>

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    Jupiter LV, provisionally known as S/2003 J 18, is a natural satellite of Jupiter. It was discovered by a team of astronomers led by Brett J. Gladman in 2003.

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    <span class="mw-page-title-main">S/2003 J 23</span> Natural satellite of Jupiter

    S/2003 J 23 is a natural satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard et al. in 2004 from pictures taken in 2003.

    S/2004 S 7 is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on 4 May 2005 from observations taken between 12 December 2004 and 8 March 2005.

    S/2004 S 12 is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on 4 May 2005 from observations taken between 12 December 2004 and 9 March 2005.

    S/2004 S 17 is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on 4 May 2005 from observations taken between 13 December 2004 and 5 March 2005.

    S/2004 S 13 is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on 4 May 2005 from observations taken between 12 December 2004 and 9 March 2005.

    S/2006 S 1 is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on June 26, 2006 from observations taken between January 4 and April 30, 2006. S/2006 S 1 is about 6 kilometres in diameter, and orbits Saturn at an average distance of 18.65 Gm in 951.1 days, at an inclination of 154.6° to the ecliptic, in a retrograde direction and with an eccentricity of 0.0814.

    S/2006 S 3 is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on June 26, 2006 from observations taken between January and April 2006.

    S/2007 S 2 is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on May 1, 2007, from observations taken between January 18 and April 19, 2007. S/2007 S 2 is about 5 kilometres in diameter, and orbits Saturn at an average distance of 16,054,500 kilometres in 759.2 days, at an inclination of 176.65° to the ecliptic, in a retrograde direction and with an eccentricity of 0.237. According to Denk et al. (2018), it is presumably at high risk of colliding with Phoebe in the future.

    Jupiter LXXII, originally known as S/2011 J 1, is a natural satellite of Jupiter. It was discovered by Scott Sheppard in 2011. It belongs to the Carme group.

    Jupiter LVI, provisionally known as S/2011 J 2, is a natural satellite of Jupiter. It was discovered by Scott Sheppard in 2011. Images of the newly discovered moon were captured using the Magellan-Baade telescope at the Las Campanas Observatory in Chile. It is an irregular moon with a retrograde orbit. The discovery of Jupiter LVI brought the Jovian satellite count to 67. It is one of the outer retrograde swarm of objects orbiting Jupiter and belongs to the Pasiphae group.

    References

    1. 1 2 MPEC 2003-E11: S/2003 J 1, 2003 J 2, 2003 J 3, 2003 J 4, 2003 J 5, 2003 J 6, 2003 J 7 2003 March 4 (discovery and ephemeris)
    2. 1 2 3 "MPEC 2021-B134 : S/2003 J 2". Minor Planet Electronic Circular. Minor Planet Center. 26 January 2021. Retrieved 26 January 2021.
    3. 1 2 3 S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
    4. ↑ IAUC 8087: Satellites of Jupiter 2003 March 4 (discovery)
    5. ↑ Sheppard, Scott S.; Jewitt, David C. (2003). "An abundant population of small irregular satellites around Jupiter" (PDF). Nature . 423 (6937): 261–263. Bibcode:2003Natur.423..261S. doi:10.1038/nature01584. PMID   12748634. S2CID   4424447. Archived from the original (PDF) on May 15, 2006.
    6. 1 2 3 Hecht, Jeff (2021-01-11). "Amateur Astronomer Finds "Lost" Moons of Jupiter". www.skyandtelescope.com. Sky & Telescope. Retrieved 2021-01-11.
    7. ↑ Beatty, Kelly (4 April 2012). "Outer-Planet Moons Found — and Lost". www.skyandtelescope.com. Sky & Telescope. Retrieved 27 June 2017.
    8. ↑ Brozović, Marina; Jacobson, Robert A. (9 March 2017). "The Orbits of Jupiter's Irregular Satellites". The Astronomical Journal. 153 (4): 147. Bibcode:2017AJ....153..147B. doi: 10.3847/1538-3881/aa5e4d .
    9. ↑ Jacobson, B.; Brozović, M.; Gladman, B.; Alexandersen, M.; Nicholson, P. D.; Veillet, C. (28 September 2012). "Irregular Satellites of the Outer Planets: Orbital Uncertainties and Astrometric Recoveries in 2009–2011". The Astronomical Journal. 144 (5): 132. Bibcode:2012AJ....144..132J. doi: 10.1088/0004-6256/144/5/132 . S2CID   123117568.
    10. ↑ Sheppard, Scott S. (2017). "New Moons of Jupiter Announced in 2017". home.dtm.ciw.edu. Retrieved 27 June 2017. We likely have all of the lost moons in our new observations from 2017, but to link them back to the remaining lost 2003 objects requires more observations a year later to confirm the linkages, which will not happen until early 2018. ... There are likely a few more new moons as well in our 2017 observations, but we need to reobserve them in 2018 to determine which of the discoveries are new and which are lost 2003 moons.


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