Neso (moon)

Template:Confused Template:Short description Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = Neso | image = {{#invoke:InfoboxImage|InfoboxImage|image=Neso VLT-FORS1 2002-09-03 annotated.gif|upright={{#if:||1.1}}|alt=}} | caption = Neso imaged by the Very Large Telescope's FORS1 imager in September 2002 | headerstyle = {{#if:|background-color:|background-color:#E0CCFF}} | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y

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| label2 = Discovered by | data2 = Template:Ubl | label3 = Discovery site | data3 = Cerro Tololo Obs. | label4 = Discovery date | data4 = 14 August 2002 | label5 = Template:Longitem | data5 =

| header10 = {{#if:|Designations|Designations}}

| label11 = Template:Longitem | data11 = Neptune XIII | label12 = Pronunciation | data12 = Template:IPAc-en | label13 = Template:Longitem | data13 = Νησώ Nēsō | label14 = Template:Longitem | data14 = S/2002 N 4 | label15 = Template:Longitem | data15 = | label16 = Adjectives | data16 = Nesoan Template:IPAc-en or Template:Nowrap | label17 = Symbol | data17 =

| header20 = Orbital characteristics{{#ifeq:|yes| (barycentric)}}

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| header60 = Proper orbital elements<ref name="JPL-Jacobson2008" />

| label61 = Template:Longitem | data61 = {{#if:49,598,300 km = 0.332 |49,598,300 km = 0.332 AU}} | label62 = Template:Longitem | data62 = 0.455 | label63 = Template:Longitem | data63 = 126.9° | label64 = Template:Longitem | data64 = {{#if:13.4246 |13.4246 degTemplate:\yr}} | label65 = Template:Longitem | data65 = {{#if:13.4246|{{#expr:360/13.4246 round 5}} yr
({{#expr:365.25*360/13.4246 round 3}} d) }} | label66 = Template:Longitem | data66 = {{#if:| arcsecTemplate:\yr }} | label67 = Template:Longitem | data67 = {{#if:1161.3684|1161.3684 arcsecTemplate:\yr}}

| header70 = Template:Anchor{{#if:| Physical characteristics|Physical characteristics}}

| label71 = Dimensions | data71 = | label72 = Template:Longitem | data72 = 60 km Template:Small<ref name="SheppardJewittKleyna2006" /> | label73 = Template:Longitem | data73 = | label74 = Template:Longitem | data74 = | label75 = Template:Longitem | data75 = | label76 = Flattening | data76 = | label77 = Circumference | data77 = | label78 = Template:Longitem | data78 = | label79 = Volume | data79 = | label80 = Mass | data80 = | label81 = Template:Longitem | data81 = | label82 = Template:Longitem | data82 = | label83 = Template:Longitem | data83 = | label84 = Template:Longitem | data84 = | label85 = Template:Longitem | data85 = | label86 = Template:Longitem | data86 = | label87 = Template:Longitem | data87 = | label88 = Template:Longitem | data88 = | label89 = Template:Longitem | data89 = | label90 = Template:Longitem | data90 = | label91 = Template:Longitem | data91 = | label92 = Template:Longitem | data92 = | label93 = {{#if: |Template:Longitem |Albedo}} | data93 = 0.04 Template:Small<ref name="SheppardJewittKleyna2006" /> | label94 = Temperature | data94 =

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Surface temp.	min	mean	max
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| label101 = Surface absorbed dose rate | data101 = | label102 = Surface equivalent dose rate | data102 = | label103 = Template:Longitem | data103 = V–R = Template:Val<ref name="Graykowski2018"/>
V–I = Template:Val<ref name="Maris2018"/>
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| header110 = Atmosphere

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Neso Template:IPAc-en, also known as Neptune XIII, is the second-outermost known natural satellite of Neptune, after S/2021 N 1. It is a retrograde irregular moon discovered by Matthew J. Holman, Brett J. Gladman, et al. on 14 August 2002, though it went unnoticed until 2003.<ref name="IAUC 8213" /><ref name="HolmanKavelaarsGrav2004" /> Neso is the second-most distant moon of Neptune, with an average orbital distance of nearly 49.6 million km. At its farthest point of its orbit, the satellite is more than 72 million km from Neptune. This distance exceeds Mercury's aphelion, which is approximately 70 million km from the Sun.

File:TheIrregulars NEPTUNE GROUPS.svg

Irregular satellites of Neptune

Neso is also the moon with the second-longest orbital period, 26.67 years. It follows a retrograde, highly inclined, and highly eccentric orbit illustrated on the diagram in relation to other irregular satellites of Neptune. The satellites above the horizontal axis are prograde, the satellites beneath it are retrograde. The yellow segments extend from the pericentre to the apocentre, showing the eccentricity.

Neso is affected by the Kozai mechanism.<ref>Template:Cite journal</ref>

Neso is about Template:Convert in diameter based on an assumed albedo of 0.04.

Given the similarity of the orbit's parameters with Psamathe (S/2003 N 1), it was suggested that both irregular satellites could have a common origin in the break-up of a larger moon.<ref name="SheppardJewittKleyna2006" />

Neso is named after one of the Nereids. Before it was officially named on 3 February 2007 (IAUC 8802), Neso was known by its provisional designation, S/2002 N 4.

See also

• List of natural satellites

References

• MPC: Natural Satellites Ephemeris Service
• Mean orbital parameters from JPL

External links

• Matthew Holman's Neptune's page
• David Jewitt's pages
• Scott Sheppard's pages
• Neso in Fiction

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