Template:গ্রহ-নেপচুন - Wikipedia

# Template:গ্রহ-নেপচুন

### উইকিপিডিয়া, মুক্ত বিশ্বকোষ থেকে

নেপচুন চিত্র:Neptune symbol.png
Click image for description
আবিস্কার
Discovered by | Urbain Le Verrier John Couch Adams Johann Galle
Discovered on | September 23, 1846
Orbital characteristics (Epoch J2000)
Semi-major axis | 4,498,252,900 km 30.068 963 48 AU
Orbital circumference | 28.263 Tm 188.925 AU
Eccentricity | 0.008 585 87
Perihelion | 4,459,631,496 km 29.810 795 27 AU
Aphelion | 4,536,874,325 km 30.327 131 69 AU
Orbital period | 60,223.3528 d (164.88 a)
Synodic period | 367.49 d
Avg. Orbital Speed | 5.432 km/s
Max. Orbital Speed | 5.479 km/s
Min. Orbital Speed | 5.385 km/s
Inclination | 1.769 17° (6.43° to Sun's equator)
Longitude of the ascending node | 131.721 69°
Argument of the perihelion | 273.249 66°
Number of satellites | 13
Physical characteristics
Equatorial diameter | 49,528 km [1] (3.883 Earths)
Polar diameter | 48,681 km (3.829 Earths)
Oblateness | 0.0171
Surface area | 7.619×109<noinclude> km2 (14.94 Earths)
Volume | 6.254×1013<noinclude> km3 (57.74 Earths)
Mass | 1.0243×1026<noinclude> kg (17.147 Earths)
Mean density | 1.638 g/cm3
Equatorial gravity (At 1 bar) | 11.15 m/s2 (1.14 g)
Escape velocity | 23.5 km/s
Rotation period | 16.11 h (16 h 6 min 36 s) 1
Rotation velocity | 2.68 km/s = 9660 km/h (at the equator)
Axial tilt | 28.32°
Right ascension of North pole | 299.33° (19 h 57 min 20 s)
Declination | 42.95°
Albedo | 0.41

Surface temp.

min | mean | max
--- | --- | ---
50 K | 53 K | N/A K

Adjective | Neptunian
Atmospheric characteristics
Surface pressure | ≫100 MPa
Hydrogen - H2 | 80% ±3.2%
Helium - He | 19% ±3.2%
Methane - CH4 | 1.5% ±0.5%
Hydrogen Deuteride - HD | 192 ppm
Ethane - C2H6 | 1.5 ppm

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