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{{Short description|Moon of Jupiter}}
{{use mdy dates|date=March 2016}}
{{use mdy dates|date=March 2016}}
{{Infobox planet
{{Infobox planet
| name = S/2003 J 12
| name = S/2003 J 12
| image = 2003 J 12 Gladman CFHT crop.gif
| image = 2003 J 12 Gladman CFHT annotated.gif
| image_size = 250
| image_scale =
| caption = S/2003 J 12 imaged by the [[Canada-France-Hawaii Telescope]] in February 2003
| caption = S/2003 J 12 imaged by the [[Canada-France-Hawaii Telescope]] during follow-up observations in February 2003
| discovery_ref = &thinsp;<ref name="MPEC-2003-E29"/>
| discovery_ref = <ref name="MPEC-2003-E29"/>
| discoverer = [[Scott S. Sheppard]] et al.
| discoverer = [[Scott S. Sheppard]] et al.
| discovery_site = [[Mauna Kea Observatory|Mauna Kea Obs.]]
| discovery_site = [[Mauna Kea Observatory|Mauna Kea Obs.]]
| discovered = 5 February 2003
| discovered = 8 February 2003
| orbit_ref = &thinsp;<ref name="MPEC-2021-A169"/>
| orbit_ref = <ref name="MPEC-2021-A169"/>
| epoch = 17 December 2020 ([[Julian day|JD]] 2459200.5)
| epoch = 17 December 2020 ([[Julian day|JD]] 2459200.5)
| observation_arc = 9.65 [[Julian year (astronomy)|yr]] (3,525 [[day|d]])
| observation_arc = 9.65 [[Julian year (astronomy)|yr]] (3,525 [[day|d]])
| earliest_precovery_date = 10 December 2001
| semimajor = {{cvt|0.1441046|AU|km|lk=in}}
| semimajor = {{cvt|0.1441046|AU|km|lk=in}}
| eccentricity = 0.3657005
| eccentricity = 0.3657005
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| satellite_of = [[Jupiter]]
| satellite_of = [[Jupiter]]
| group = [[Ananke group]]
| group = [[Ananke group]]
| mean_diameter = ≈{{val|1|u=km}}<ref name="SheppardMoons"/>
| physical_ref = <ref name="EmelyanovEtAl2022"/>
| mean_radius = {{val|1.2|u=km}}
| mass = {{val|1.9|e=13|u=kg}}
| density = 2.6 g/cm<sup>3</sup> (assumed)
| rotation =
| rotation =
| albedo = 0.04 {{small|(assumed)}}<ref name="SheppardMoons"/>
| albedo = 0.04 {{small|(assumed)}}<ref name="SheppardMoons"/>
| magnitude = 23.9<ref name="SheppardMoons"/>
| magnitude = 23.9<ref name="SheppardMoons"/>
| abs_magnitude = 17.0<ref name="MPEC-2021-A169"/>
| abs_magnitude = 17.0<ref name="MPEC-2021-A169"/><br>{{val|16.81|0.19}} (R)<ref name="EmelyanovEtAl2022"/>
}}
}}


'''{{nowrap|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.<ref>{{cite web |author=Daniel W. E. Green |url=http://www.cbat.eps.harvard.edu/iauc/08000/08089.html |publisher=[[International Astronomical Union]] |title=IAUC 8089: Satellites of Jupiter |date=March 7, 2003}}</ref><ref name="MPEC-2003-E29">[https://www.minorplanetcenter.net/mpec/K03/K03E29.html MPEC 2003-E29: S/2003 J 9, 2003 J 10, 2003 J 11, 2003 J 12; S/2003 J 1, 2003 J 6] April 3, 2003 (discovery and ephemeris)</ref>
'''{{nowrap|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.<ref>{{cite web |author=Daniel W. E. Green |url=http://www.cbat.eps.harvard.edu/iauc/08000/08089.html |publisher=[[International Astronomical Union]] |title=IAUC 8089: Satellites of Jupiter |date=March 7, 2003}}</ref><ref name="MPEC-2003-E29">[https://www.minorplanetcenter.net/mpec/K03/K03E29.html MPEC 2003-E29: S/2003 J 9, 2003 J 10, 2003 J 11, 2003 J 12; S/2003 J 1, 2003 J 6] April 3, 2003 (discovery and ephemeris)</ref>


⚫
{{nowrap|S/2003 J 12}} is about {{cvt|2.4|km}} in diameter, and orbits Jupiter at an average distance of 21,600&nbsp;[[Orders_of_magnitude_(length)#1_megametre|Mm]] in 647 days, at an [[inclination]] of 155° to the [[ecliptic]], in a [[retrograde motion|retrograde]] direction and with an [[eccentricity (orbit)|eccentricity]] of 0.366.<ref name="MPEC-2021-A169"/> It was initially thought to the innermost of the retrograde satellites of Jupiter, but recovery observations have shown that it is an ordinary member of the [[Ananke group]].<ref name="Hecht2020"/>
[[File:2003 J 12 Gladman CFHT annotated.gif|thumb|left|S/2003 J 12 imaged by the [[Canada-France-Hawaii Telescope]] during follow-up observations on 24 February 2003]]


[[File:2003 J 12 CFHT precovery 2001-12-10.gif|thumb|left|Blink animation of S/2003 J 12 in CFHT precovery images from December 2001]]
⚫
{{nowrap|S/2003 J 12}} is about 1 kilometre (0.6 miles) in diameter, and orbits Jupiter at an average distance of 21,600&nbsp;[[Orders_of_magnitude_(length)#1_megametre|Mm]] in 647 days, at an [[inclination]] of 155° to the [[ecliptic]], in a [[retrograde motion|retrograde]] direction and with an [[eccentricity (orbit)|eccentricity]] of 0.366.<ref name="MPEC-2021-A169"/> It was initially thought to the innermost of the retrograde satellites of Jupiter, but recovery observations have shown that it is an ordinary member of the [[Ananke group]].<ref name="Hecht2020"/>
[[File:2003 J 12 CFHT 2011-08-05.gif|thumb|left|Recovery images of S/2003 J 12 taken by the CFHT in August 2011]]

This moon was considered [[lost asteroid|lost]]<ref>{{cite web |url=http://www.skyandtelescope.com/astronomy-news/outer-planet-moons-found-and-lost/ |title=Outer-Planet Moons Found — and Lost |last=Beatty |first=Kelly |date=4 April 2012 |website=www.skyandtelescope.com |publisher=Sky & Telescope |access-date=27 June 2017}}</ref><ref name=Jacobson>{{cite journal |last1=Brozović |first1=Marina |last2=Jacobson |first2=Robert A. |date=9 March 2017 |title=The Orbits of Jupiter's Irregular Satellites |journal=The Astronomical Journal |volume=153 |issue=4 |pages=147 |doi=10.3847/1538-3881/aa5e4d|bibcode = 2017AJ....153..147B |doi-access=free }}</ref><ref>{{cite journal |last1=Jacobson |first1=B. |last2=Brozović |first2=M. |first3=B. |last3=Gladman |first4=M. |last4=Alexandersen |first5=P. D. |last5=Nicholson |first6=C. |last6=Veillet |date=28 September 2012 |title=Irregular Satellites of the Outer Planets: Orbital Uncertainties and Astrometric Recoveries in 2009–2011 |journal=The Astronomical Journal |volume=144 |issue=5 |pages=132 |doi=10.1088/0004-6256/144/5/132 |bibcode = 2012AJ....144..132J }}</ref><ref>{{cite web |url=http://home.dtm.ciw.edu/users/sheppard/satellites/jup2017.html |title=New Moons of Jupiter Announced in 2017 |last=Sheppard |first=Scott S. |date=2017 |website=home.dtm.ciw.edu |access-date=27 June 2017 |quote=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.}}</ref> until late 2020, when it was recovered in archival CFHT images from 2003-2011 by an amateur astronomer under the name Kenneth.<ref name="Hecht2020">{{cite web |url=https://skyandtelescope.org/astronomy-news/amateur-astronomer-finds-lost-moons-of-jupiter/ |title=Amateur Astronomer Finds "Lost" Moons of Jupiter |last=Hecht |first=Jeff |date=2021-01-11 |website=www.skyandtelescope.com |publisher=Sky & Telescope |access-date=2021-01-11}}</ref> The recovery of the moon was announced by the [[Minor Planet Center]] on 13 January 2021.<ref name="MPEC-2021-A169"/>
This moon was considered [[lost asteroid|lost]]<ref>{{cite web |url=http://www.skyandtelescope.com/astronomy-news/outer-planet-moons-found-and-lost/ |title=Outer-Planet Moons Found — and Lost |last=Beatty |first=Kelly |date=4 April 2012 |website=www.skyandtelescope.com |publisher=Sky & Telescope |access-date=27 June 2017}}</ref><ref name=Jacobson>{{cite journal |last1=Brozović |first1=Marina |last2=Jacobson |first2=Robert A. |date=9 March 2017 |title=The Orbits of Jupiter's Irregular Satellites |journal=The Astronomical Journal |volume=153 |issue=4 |pages=147 |doi=10.3847/1538-3881/aa5e4d|bibcode = 2017AJ....153..147B |doi-access=free }}</ref><ref>{{cite journal |last1=Jacobson |first1=B. |last2=Brozović |first2=M. |first3=B. |last3=Gladman |first4=M. |last4=Alexandersen |first5=P. D. |last5=Nicholson |first6=C. |last6=Veillet |date=28 September 2012 |title=Irregular Satellites of the Outer Planets: Orbital Uncertainties and Astrometric Recoveries in 2009–2011 |journal=The Astronomical Journal |volume=144 |issue=5 |pages=132 |doi=10.1088/0004-6256/144/5/132 |bibcode = 2012AJ....144..132J |s2cid=123117568 |doi-access=free }}</ref><ref>{{cite web |url=http://home.dtm.ciw.edu/users/sheppard/satellites/jup2017.html |title=New Moons of Jupiter Announced in 2017 |last=Sheppard |first=Scott S. |date=2017 |website=home.dtm.ciw.edu |access-date=27 June 2017 |quote=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.}}</ref> until late 2020, when it was recovered in archival CFHT images from 2001-2011 by amateur astronomer Kai Ly.<ref name="Hecht2020">{{cite web |url=https://skyandtelescope.org/astronomy-news/amateur-astronomer-finds-lost-moons-of-jupiter/ |title=Amateur Astronomer Finds "Lost" Moons of Jupiter |last=Hecht |first=Jeff |date=2021-01-11 |website=www.skyandtelescope.com |publisher=Sky & Telescope |access-date=2021-01-11}}</ref> The recovery of the moon was announced by the [[Minor Planet Center]] on 13 January 2021.<ref name="MPEC-2021-A169"/>
{{clear|left}}
{{clear|left}}


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<ref name="MPEC-2021-A169">{{cite web
<ref name="MPEC-2021-A169">{{cite web
|title = MPEC 2021-V169 : S/2003 J 12
|title = MPEC 2021-A169 : S/2003 J 12
|url = https://minorplanetcenter.net/mpec/K21/K21AG9.html
|url = https://minorplanetcenter.net/mpec/K21/K21AG9.html
|work = Minor Planet Electronic Circular
|work = Minor Planet Electronic Circular
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|date = 13 January 2021
|date = 13 January 2021
|accessdate = 13 January 2021}}</ref>
|accessdate = 13 January 2021}}</ref>

<ref name="EmelyanovEtAl2022">{{cite journal |author1=Emelyanov |first=N. V. |author2=Varfolomeev |first2=M. I. |author3=Lainey |first3=V. |date=24 March 2022 |title=New ephemerides of outer planetary satellites |journal=Monthly Notices of the Royal Astronomical Society |volume=512 |issue=2 |pages=2044–2050 |doi=10.1093/mnras/stac586 |doi-access=free}}</ref>


}}
}}
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[[Category:Ananke group]]
[[Category:Ananke group]]
[[Category:Irregular satellites]]
[[Category:Irregular satellites]]
[[Category:Astronomical objects discovered in 2003]]
[[Category:Astronomical objects discovered in 2003|20030208]]
[[Category:Discoveries by Scott S. Sheppard]]
[[Category:Moons with a retrograde orbit]]
[[Category:Recovered astronomical objects]]

Latest revision as of 23:58, 25 December 2024

S/2003 J 12
S/2003 J 12 imaged by the Canada-France-Hawaii Telescope during follow-up observations in February 2003
Discovery[1]
Discovered byScott S. Sheppard et al.
Discovery siteMauna Kea Obs.
Discovery date8 February 2003
Orbital characteristics[2]
Epoch 17 December 2020 (JD 2459200.5)
Observation arc9.65 yr (3,525 d)
Earliest precovery date10 December 2001
0.1441046 AU (21,557,740 km)
Eccentricity0.3657005
–1.77 yr (–646.64 d)
295.36521°
0° 33m 24.215s / day
Inclination154.69036° (to ecliptic)
127.52296°
86.84711°
Satellite ofJupiter
GroupAnanke group
Physical characteristics[3]
1.2 km
Mass1.9×1013 kg
Mean density
2.6 g/cm3 (assumed)
Albedo0.04 (assumed)[4]
23.9[4]
17.0[2]
16.81±0.19 (R)[3]

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.[5][1]

S/2003 J 12 is about 2.4 km (1.5 mi) in diameter, and orbits Jupiter at an average distance of 21,600 Mm in 647 days, at an inclination of 155° to the ecliptic, in a retrograde direction and with an eccentricity of 0.366.[2] It was initially thought to the innermost of the retrograde satellites of Jupiter, but recovery observations have shown that it is an ordinary member of the Ananke group.[6]

Blink animation of S/2003 J 12 in CFHT precovery images from December 2001
Recovery images of S/2003 J 12 taken by the CFHT in August 2011

This moon was considered lost[7][8][9][10] until late 2020, when it was recovered in archival CFHT images from 2001-2011 by amateur astronomer Kai Ly.[6] The recovery of the moon was announced by the Minor Planet Center on 13 January 2021.[2]

References

[edit]
  1. ^ a b MPEC 2003-E29: S/2003 J 9, 2003 J 10, 2003 J 11, 2003 J 12; S/2003 J 1, 2003 J 6 April 3, 2003 (discovery and ephemeris)
  2. ^ a b c d "MPEC 2021-A169 : S/2003 J 12". Minor Planet Electronic Circular. Minor Planet Center. January 13, 2021. Retrieved January 13, 2021.
  3. ^ a b Emelyanov, N. V.; Varfolomeev, M. I.; Lainey, V. (March 24, 2022). "New ephemerides of outer planetary satellites". Monthly Notices of the Royal Astronomical Society. 512 (2): 2044–2050. doi:10.1093/mnras/stac586.
  4. ^ a b S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
  5. ^ Daniel W. E. Green (March 7, 2003). "IAUC 8089: Satellites of Jupiter". International Astronomical Union.
  6. ^ a b Hecht, Jeff (January 11, 2021). "Amateur Astronomer Finds "Lost" Moons of Jupiter". www.skyandtelescope.com. Sky & Telescope. Retrieved January 11, 2021.
  7. ^ Beatty, Kelly (April 4, 2012). "Outer-Planet Moons Found — and Lost". www.skyandtelescope.com. Sky & Telescope. Retrieved June 27, 2017.
  8. ^ Brozović, Marina; Jacobson, Robert A. (March 9, 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. (September 28, 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 June 27, 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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