ᱵᱷᱩᱛ ᱮᱸᱜᱮᱞ
Discovery[᱑] | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Discovered by | |||||||||||||
Discovery date | 23 September 1846 | ||||||||||||
Designations | |||||||||||||
Pronunciation | /ˈnɛptjuːn/[᱒] | ||||||||||||
Named after | Latin Neptūnus, via French Neptune | ||||||||||||
Adjectives | Neptunian /nɛpˈtjuːniən/,[᱓] Poseidean[᱔] | ||||||||||||
Orbital characteristics[᱘][lower-alpha ᱑] | |||||||||||||
Epoch J2000 | |||||||||||||
Aphelion | 30.33 AU (4.54 billion km) | ||||||||||||
Perihelion | 29.81 AU (4.46 billion km) | ||||||||||||
30.11 AU (4.50 billion km) | |||||||||||||
Eccentricity | 456 0.009 | ||||||||||||
| |||||||||||||
367.49 days[᱖] | |||||||||||||
Average orbital speed | 5.43 km/s[᱖] | ||||||||||||
256.228° | |||||||||||||
Inclination | 975° to 1.767ecliptic 6.43° to Sun's equator 0.72° to invariable plane[᱗] | ||||||||||||
131.784° | |||||||||||||
276.336° | |||||||||||||
Known satellites | 14 | ||||||||||||
Physical characteristics | |||||||||||||
Mean radius | ±19 km 24,622[᱙][lower-alpha ᱒] | ||||||||||||
Equatorial radius | ±15 km 24,764[᱙][lower-alpha ᱒] 3.883 Earths | ||||||||||||
Polar radius | ±30 km 24,341[᱙][lower-alpha ᱒] 3.829 Earths | ||||||||||||
Flattening | ±0.0013 0.0171 | ||||||||||||
×109 km2 7.6183[᱑᱐][lower-alpha ᱒] 14.98 Earths | |||||||||||||
Volume | ×1013 km3 6.254[᱖][lower-alpha ᱒] 57.74 Earths | ||||||||||||
Mass | 13×1026 kg 1.024[᱖] 17.147 Earths 5.15 × 10-5 Suns | ||||||||||||
Mean density | 1.638 g/cm3[᱖][lower-alpha ᱓] | ||||||||||||
11.15 m/s2[᱖][lower-alpha ᱒] 1.14 g | |||||||||||||
0.23[᱑᱑] (estimate) | |||||||||||||
23.5 km/s[᱖][lower-alpha ᱒] | |||||||||||||
Sidereal rotation period | 0.6713 day[᱖] 16 h 6 min 36 s | ||||||||||||
Equatorial rotation velocity | 2.68 km/s (9,650 km/h) | ||||||||||||
28.32° (to orbit)[᱖] | |||||||||||||
North pole right ascension | ᱪᱷᱟᱸᱪ:RA[᱙] 299.3° | ||||||||||||
North pole declination | 42.950°[᱙] | ||||||||||||
Albedo | 0.290 (bond)[᱑᱒] 0.442 (geom.)[᱑᱓] | ||||||||||||
| |||||||||||||
7.67[᱑᱔] to 8.00[᱑᱔] | |||||||||||||
2.2–2.4″[᱖][᱑᱕] | |||||||||||||
Atmosphere[᱖] | |||||||||||||
±0.6 km 19.7 | |||||||||||||
Composition by volume |
| ||||||||||||
ᱵᱟᱷᱨᱤ ᱰᱷᱟᱸᱪᱟ
ᱥᱟᱯᱲᱟᱣᱥᱟᱹᱠᱷᱭᱟᱹᱛ
ᱥᱟᱯᱲᱟᱣ- ↑ Hamilton, Calvin J. (4 August 2001). "Neptune". Views of the Solar System. Archived from the original on 15 July 2007. Retrieved 13 August 2007.
- ↑ Walter, Elizabeth (21 April 2003). Cambridge Advanced Learner's Dictionary (2nd ed.). Cambridge University Press. ISBN 978-0-521-53106-1.
- ↑ "Neptunian". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
- ↑ "Enabling Exploration with Small Radioisotope Power Systems" (PDF). NASA. September 2004. Archived from the original (PDF) on 22 December 2016. Retrieved 26 January 2016.
- ↑ Seligman, Courtney. "Rotation Period and Day Length". Archived from the original on 11 August 2011. Retrieved 13 August 2009.
- ↑ ᱖.᱐᱐ ᱖.᱐᱑ ᱖.᱐᱒ ᱖.᱐᱓ ᱖.᱐᱔ ᱖.᱐᱕ ᱖.᱐᱖ ᱖.᱐᱗ ᱖.᱐᱘ ᱖.᱐᱙ ᱖.᱑᱐ ᱖.᱑᱑ ᱖.᱑᱒ Williams, David R. (1 September 2004). "Neptune Fact Sheet". NASA. Archived from the original on 1 July 2010. Retrieved 14 August 2007.
- ↑ "The MeanPlane (Invariable plane) of the Solar System passing through the barycenter". 3 April 2009. Archived from the original on 14 May 2009. Retrieved 10 April 2009. (produced with Solex 10 Archived ᱒᱔ ᱢᱮ ᱒᱐᱑᱕ at the Wayback Machine. written by Aldo Vitagliano; see also Invariable plane)
- ↑ Yeomans, Donald K. "HORIZONS Web-Interface for Neptune Barycenter (Major Body=8)". JPL Horizons On-Line Ephemeris System. Archived from the original on 20 August 2014. Retrieved 18 July 2014.—Select "Ephemeris Type: Orbital Elements", "Time Span: 2000-01-01 12:00 to 2000-01-02". ("Target Body: Neptune Barycenter" and "Center: Solar System Barycenter (@0)".)
- ↑ ᱙.᱐ ᱙.᱑ ᱙.᱒ ᱙.᱓ ᱙.᱔ ᱛᱩᱢᱟᱹᱞ ᱦᱩᱲᱟᱹᱜ:Invalid
<ref>
tag; no text was provided for refs namedSeidelmann Archinal A'hearn et al. 2007
- ↑ ᱛᱩᱢᱟᱹᱞ ᱦᱩᱲᱟᱹᱜ:Invalid
<ref>
tag; no text was provided for refs namedfact2
- ↑ de Pater, Imke; Lissauer, Jack J. (2015). Planetary Sciences (2nd updated ed.). New York: Cambridge University Press. p. 250. ISBN 978-0-521-85371-2. Archived from the original on 26 November 2016. Retrieved 17 August 2016.
- ↑ ᱛᱩᱢᱟᱹᱞ ᱦᱩᱲᱟᱹᱜ:Invalid
<ref>
tag; no text was provided for refs namedPearl_et_al_Neptune
- ↑ ᱛᱩᱢᱟᱹᱞ ᱦᱩᱲᱟᱹᱜ:Invalid
<ref>
tag; no text was provided for refs namedMallama_et_al
- ↑ ᱑᱔.᱐ ᱑᱔.᱑ ᱛᱩᱢᱟᱹᱞ ᱦᱩᱲᱟᱹᱜ:Invalid
<ref>
tag; no text was provided for refs namedMallama_and_Hilton
- ↑ Espenak, Fred (20 July 2005). "Twelve Year Planetary Ephemeris: 1995–2006". NASA. Archived from the original on 5 December 2012. Retrieved 1 March 2008.
<ref>
tag defined in <references>
has no name attribute.
ᱛᱩᱢᱟᱹᱞ ᱦᱩᱲᱟᱹᱜ:<ref>
tags exist for a group named "lower-alpha", but no corresponding <references group="lower-alpha"/>
tag was found