Jump to content
 







Main menu
   


Navigation  



Main page
Contents
Current events
Random article
About Wikipedia
Contact us
Donate
 




Contribute  



Help
Learn to edit
Community portal
Recent changes
Upload file
 








Search  

































Create account

Log in
 









Create account
 Log in
 




Pages for logged out editors learn more  



Contributions
Talk
 



















Contents

   



(Top)
 


1 References  














S/2021 J 4






Deutsch
Español
Bahasa Indonesia
Italiano
Latviešu
Română
Svenska
Українська
 

Edit links
 









Article
Talk
 

















Read
Edit
View history
 








Tools
   


Actions  



Read
Edit
View history
 




General  



What links here
Related changes
Upload file
Special pages
Permanent link
Page information
Cite this page
Get shortened URL
Download QR code
Wikidata item
 




Print/export  



Download as PDF
Printable version
 
















Appearance
   

 






From Wikipedia, the free encyclopedia
 


S/2021 J 4
Discovery[1]
Discovered byScott S. Sheppard
Discovery siteLas Campanas Obs.
Discovery date14 August 2021
Orbital characteristics[1][2]
Epoch 25 February 2023 (JD 2460000.5)
Observation arc1.17 yr (427 d)

Semi-major axis

0.1533891 AU (22,946,680 km)
Eccentricity0.1585459

Orbital period (sidereal)

–1.94 yr (–710.13 days)

Mean anomaly

102.76481°

Mean motion

0° 30m 25.027s / day
Inclination164.54657° (toecliptic)

Longitude of ascending node

218.88401°

Argument of perihelion

217.30730°
Satellite ofJupiter
GroupCarme group
Physical characteristics

Mean diameter

km[3]

Apparent magnitude

24.0[3]

Absolute magnitude (H)

17.4[1]

S/2021 J 4 is a small outer natural satelliteofJupiter discovered by Scott S. Sheppard on 14 August 2021, using the 6.5-meter Magellan-Baade TelescopeatLas Campanas Observatory, Chile. It was announced by the Minor Planet Center on 19 January 2023, after observations were collected over a long enough time span to confirm the satellite's orbit.[1]

S/2021 J 4 is part of the Carme group, a tight cluster of retrograde irregular moons of Jupiter that follow similar orbits to Carmeatsemi-major axes between 22–24 million km (14–15 million mi), orbital eccentricities between 0.2 and 0.3, and inclinations between 163 and 166°.[3] It has a diameter of about 1 km (0.62 mi) for an absolute magnitude of 17.4, making it one of Jupiter's smallest known moons.[3]

References

[edit]
  1. ^ a b c d "MPEC 2023-B40 : S/2021 J 4". Minor Planet Electronic Circulars. Minor Planet Center. 19 January 2023. Retrieved 20 January 2023.
  • ^ "Planetary Satellite Discovery Circumstances". JPL Solar System Dynamics. NASA. Retrieved 10 January 2023.
  • ^ a b c d Sheppard, Scott S. "Moons of Jupiter". Earth & Planets Laboratory. Carnegie Institution for Science. Retrieved 10 January 2023.

  • t
  • e

  • Retrieved from "https://en.wikipedia.org/w/index.php?title=S/2021_J_4&oldid=1167966313"

    Categories: 
    Carme group
    Moons of Jupiter
    Irregular satellites
    Astronomical objects discovered in 2021
    Discoveries by Scott S. Sheppard
    Moons with a retrograde orbit
    Planetary science stubs
    Hidden category: 
    All stub articles
     



    This page was last edited on 30 July 2023, at 23:35 (UTC).

    Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.



    Privacy policy

    About Wikipedia

    Disclaimers

    Contact Wikipedia

    Code of Conduct

    Developers

    Statistics

    Cookie statement

    Mobile view



    Wikimedia Foundation
    Powered by MediaWiki