Nẹ́ptúnù

**Nẹ́ptúnù - Neptune**
	Neptune from Voyager 2 with Great Dark Spot at left
Ìkọ́kọ́wárí
Kíkọ́kọ́wárí látọwọ́	Urbain Le Verrier; John Couch Adams; Johann Galle
Ọjọ́ ìkọ́kọ́wárí	September 23, 1846
Ìfúnlọ́rúkọ
Ìpolongo	i /ˈnɛptuːn/
Alápèjúwe	Neptunian
Àwọn ìhùwà ìgbàyípo
	Àsìkò J2000
Aphelion	4,553,946,490 km; 30.44125206 AU
Perihelion	4,452,940,833 km; 29.76607095 AU
Semi-major axis	4,503,443,661 km; 30.10366151 AU
Eccentricity	0.011214269
Àsìkò ìgbàyípo	60,190 days; 164.79 years; 89,666 Neptune solar days
Synodic period	367.49 day
Average orbital speed	5.43 km/s
Mean anomaly	267.767281°
Inclination	1.767975° to Ecliptic; 6.43° to Sun’s equator; 0.72° to Invariable plane
Longitude of ascending node	131.794310°
Argument of perihelion	265.646853°
Satellites	13
Àwọn ìhùwà àdánidá
Ìfẹ̀kiri alágedeméjì	24,764 ± 15 km; 3.883 Earths
Ìfẹ̀kiri olóòpó	24,341 ± 30 km; 3.829 Earths
Flattening	0.0171 ± 0.0013
Ààlà ojúde	7.6183 × 109 km2; 14.98 Earths
Ìpọ̀sí	6.254 × 1013 km3; 57.74 Earths
Àkójọ	1.0243×1026 kg; 17.147 Earths
Iyeìdáméjì ìṣùpọ̀	1.638 g/cm3
Equatorial surface gravity	11.15 m/s2; 1.14 g
Escape velocity	23.5 km/s
Sidereal rotation; period	0.6713 day; 16 h 6 min 36 s
Equatorial rotation velocity	2.68 km/s; 9,660 km/h
Axial tilt	28.32°
North pole right ascension	19h 57m 20s; 299.3°
North pole declination	42.950°
Albedo	0.290 (bond); 0.41 (geom.)
Apparent magnitude	8.02 to 7.78
Angular diameter	2.2″–2.4″
Afẹ́fẹ́àyíká
Ìga òṣùwọ̀n	19.7 ± 0.6 km
80±3.2%	Hydrogen (H2)
19±3.2%	Helium
1.5±0.5%	Methane
~0.019%	Hydrogen deuteride (HD)
~0.00015%	Ethane
Ices:
	Ammonia
	Water
	Ammonium hydrosulfide(NH4SH)
	Methane (?)