Chaldene

{{Infobox planet

| name = Chaldene

| image = Chaldene-Jewitt-CFHT-annotated.gif

| image_scale =

| caption = Chaldene imaged by the Canada-France-Hawaii Telescope in December 2001

| pronounced = {{IPAc-en|k|æ|l|ˈ|d|iː|n|iː}}

| adjective = Chaldenean {{IPAc-en|k|æ|l|d|ᵻ|ˈ|n|iː|ə|n}}

| named_after = Χαλδηνή Chaldēnē

| mpc_name = Jupiter XXI

| alt_names = S/2000 J 10

| discovery_ref =

| discoverer = Scott S. Sheppard
David C. Jewitt
Yanga R. Fernandez
Eugene A. Magnier

| discovery_site = Mauna Kea Observatory

| discovered = 23 November 2000

| earliest_precovery_date =

| satellite_of = Jupiter

| group = Carme group

| orbit_ref =

| epoch = 27 April 2019 (JD 2458600.5)

| observation_arc = 17.46 yr (6,376 days)

| semimajor = {{cvt|0.1604721|AU|km|lk=in}}

| eccentricity = 0.1500864

| period = –759.88 d

| mean_anomaly = 159.35152°

| mean_motion = {{Deg2DMS|0.47376101|sup=ms}} / day

| inclination = 164.25379° (to ecliptic)

| asc_node = 215.26817°

| arg_peri = 340.66981°

| physical_ref =

| mean_diameter = 4 km

| mass =

| density =

| surface_grav =

| escape_velocity =

| rotation =

| albedo = 0.04 (assumed)

| spectral_type = B–V = 0.82 ± 0.05, V–R = 0.50 ± 0.05{{Cite journal |last=Graykowski |first=Ariel |last2=Jewitt |first2=David |date=2018-04-05 |title=Colors and Shapes of the Irregular Planetary Satellites |url=https://iopscience.iop.org/article/10.3847/1538-3881/aab49b |journal=The Astronomical Journal |language=en |volume=155 |issue=4 |pages=184 |doi=10.3847/1538-3881/aab49b |issn=1538-3881 |doi-access=free|arxiv=1803.01907 }}

| magnitude = 22.5

| abs_magnitude = 16.0

}}

Chaldene {{IPAc-en|k|æ|l|ˈ|d|iː|n|iː}}, also known as {{nowrap|Jupiter XXI}}, 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 2000, and given the temporary designation {{nowrap|S/2000 J 10}}.[http://cbat.eps.harvard.edu/iauc/07500/07555.html IAUC 7555: Satellites of Jupiter] {{webarchive|url=https://web.archive.org/web/20020916000558/http://cfa-www.harvard.edu/iauc/07500/07555.html |date=2002-09-16 }} 2001 January 5 (discovery)[http://cfa-www.harvard.edu/mpec/K01/K01A29.html MPEC 2001-A29: S/2000 J 7, S/2000 J 8, S/2000 J 9, S/2000 J 10, S/2000 J 11] 2001 January 15 (discovery and ephemeris)[http://cfa-www.harvard.edu/mpec/K01/K01T59.html MPEC 2001-T59: S/2000 J 8, S/2000 J 9, S/2000 J 10] 2001 October 15 (revised ephemeris)

Chaldene is about 3.8 kilometres in diameter, and orbits Jupiter at an average distance of 22,713,000 km in 759.88 days, at an inclination of 167° to the ecliptic (169° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.2916.

It was named in October 2002 after Chaldene, the mother of Solymos by Zeus in Greek mythology.[http://www.cbat.eps.harvard.edu/iauc/07900/07998.html IAUC 7998: Satellites of Jupiter] 2002 October 22 (naming the moon)

It belongs to the Carme group, made up of irregular retrograde moons orbiting Jupiter at a distance ranging between 23 and 24 Gm and at an inclination of about 165°.