Nettunu

Nettunu
	Nettunu da Voyager 2 incù Great Dark Spot à manca è Small Dark Spot à dritta.
Discovery
Scuparta da	Urbain Le Verrier; John Couch Adams; Johann Galle;
Data di scuparta	23 Sittembre di u 1846
Designations
Pronuncia	Template:IPAc-en
Adjective	Nettunianu
Orbital characteristics
	Epoch J2000
Aphelion	4,553,946,490 km ; 30.44125206 AU
Perihelion	4,452,940,833 km ; 29.76607095 AU
Acchisi mezu maggiore	4,503,443,661 km ; 30.10366151 AU
Eccentricità	0.011214269
Periodu orbitale	60,190.03 days ; 164.79 years ; 89,666 Neptune solar days
Periodu sinodicu	367.49 day
Vitezza orbitale	5.43 km/s
Anumalia media	267.767281°
Inclinazione	1.767975° to Ecliptic ; 6.43° to Sun’s equator ; 0.72° to Invariable plane
Longitudine di u nodu ascindente	131.794310°
Argument of perihelion	265.646853°
Satelliti	13
Physical characteristics
Radiu Equatoriale	24,764 ± 15 km ; 3.883 Earths
Polar radiu	24,341 ± 30 km ; 3.829 Earths
Flattening	0.0171 ± 0.0013
Surface area	7.6183×10Template:Val/delimitnum km2 ; 14.98 Earths
Volume	6.254×10Template:Val/delimitnum km3 ; 57.74 Earths
Massa	1.0243×1026 kg ; 17.147 Earths; 5.15×10Template:Val/delimitnum Suns
Densità media	1.638 g/cm3
Equatorial surface gravity	11.15 m/s2 ; 1.14 g
Escape velocity	23.5 km/s
Periodu di rotazione siderale	0.6713 day ; 16 h 6 min 36 s
Vitezza di rotazione equatoriale	2.68 km/s ; 9,660 km/h
Axial tilt	28.32°
Polu Nordu ascensione dritta	Template:RA ; 299.3°
Polu nordu declinazione	42.950°
Albedo	0.290 (bond) ; 0.41 (geom.)
magnitude apparente	8.02 to 7.78
Diamitru angulare	2.2–2.4″
Atmosphere
Scale height	19.7 ± 0.6 km
Composizione
80±3.2%	hydrogen (H2)
19±3.2%	helium (He)
1.5±0.5%	methane (CH4)
~0.019%	hydrogen deuteride (HD)
~0.00015%	ethane (C2H6)
	Ices: ammonia (NH3); acqua (H2O); ammonium hydrosulfide (NH4SH); methane (?);

Nettunu hè l'ottava pianeta in u sistemu sulare. Hè a quarta pianeta più larga per via di u diamitru.

Da vede dinù

WikiLettera

'Ssu artìculu hè in custruzzione. Pudete cuntribuisce à a so redazzione.

↑ http://www.solarviews.com/eng/neptune.htm.
↑ ISBN 978-0-521-53106-1.
↑ ^3,0 ^3,1 http://solarsystem.nasa.gov/planets/profile.cfm?Object=Neptune&Display=Facts.
↑ http://cseligman.com/text/sky/rotationvsday.htm.
↑ ^5,00 ^5,01 ^5,02 ^5,03 ^5,04 ^5,05 ^5,06 ^5,07 ^5,08 ^5,09 ^5,10 ^5,11 ^5,12 ^5,13 ^5,14 http://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html.
↑ http://home.surewest.net/kheider/astro/MeanPlane.gif. (produced with Solex 10 written by Aldo Vitagliano; see also Invariable plane)
↑ http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=mb&sstr=8. At the site, go to the "web interface" then select "Ephemeris Type: Elements", "Target Body: Neptune Barycenter" and "Center: Sun".
↑ Orbital elements refer to the barycentre of the Neptune system, and are the instantaneous osculating values at the precise J2000 epoch. Barycentre quantities are given because, in contrast to the planetary centre, they do not experience appreciable changes on a day-to-day basis from the motion of the moons.
↑ ^9,0 ^9,1 ^9,2 ^9,3 Vol. 98. Bibcode:2007CeMDA..98..155S, DOI:10.1007/s10569-007-9072-y.
↑ ^10,0 ^10,1 ^10,2 ^10,3 ^10,4 ^10,5 ^10,6 Refers to the level of Template:Convert/bar Template:Convert/test/A atmospheric pressure
↑ ^11,0 ^11,1 http://eclipse.gsfc.nasa.gov/TYPE/TYPE.html.

[Hamilton-1] ttp://www.solarviews.com/eng/neptune.htm.

[2] ISBN 978-0-521-53106-1.

[fact2-3] 3,0 ^3,1 http://solarsystem.nasa.gov/planets/profile.cfm?Object=Neptune&Display=Facts.

[planet_years-4] ttp://cseligman.com/text/sky/rotationvsday.htm.

[fact-5] 5,00 ^5,01 ^5,02 ^5,03 ^5,04 ^5,05 ^5,06 ^5,07 ^5,08 ^5,09 ^5,10 ^5,11 ^5,12 ^5,13 ^5,14 http://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html.

[meanplane-6] ttp://home.surewest.net/kheider/astro/MeanPlane.gif. (produced with Solex 10 written by Aldo Vitagliano; see also Invariable plane)

[horizons-7] ttp://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=mb&sstr=8. At the site, go to the "web interface" then select "Ephemeris Type: Elements", "Target Body: Neptune Barycenter" and "Center: Sun".

[barycentre-8] Orbital elements refer to the barycentre of the Neptune system, and are the instantaneous osculating values at the precise J2000 epoch. Barycentre quantities are given because, in contrast to the planetary centre, they do not experience appreciable changes on a day-to-day basis from the motion of the moons.

[Seidelmann_Archinal_A'hearn_et_al._2007-9] 9,0 ^9,1 ^9,2 ^9,3 Vol. 98. Bibcode:2007CeMDA..98..155S, DOI:10.1007/s10569-007-9072-y.

[1bar-10] 10,0 ^10,1 ^10,2 ^10,3 ^10,4 ^10,5 ^10,6 Refers to the level of Template:Convert/bar Template:Convert/test/A atmospheric pressure

[ephemeris-11] 11,0 ^11,1 http://eclipse.gsfc.nasa.gov/TYPE/TYPE.html.

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