अम्ब्रिअल (उपग्रहः)

अम्ब्रिअल

वॉयेजर द्वितीय यानात् १९८६ आव्दे गृहितं चित्रमिदम्।
Discovery
Discovered by	William Lassell
Discovery date	October 24, 1851
Designations
Alternate name(s)	Uranus II
Adjective	Umbrielian
Orbital characteristics
Semi-major axis	२,६६,००० km
Eccentricity	०.0039
Orbital period	४.144 d
Inclination	०.128 ° (to Uranus's equator)
Satellite of	Uranus
Physical characteristics
Mean radius	५८४.7±२.8 km (0.092 Earths)
Surface area	४२,९६,००० km2 (0.008 Earths)
Volume	८३,७३,००,००० km3 (0.0008 Earths)
Mass	१.172±०.135×10२१ kg (2फलकम्:Esp Earths)
Mean density	१.39±०.16 g/cm3
Equatorial surface gravity	फलकम्:Gr m/s2 (~ 0.023 g)
Escape velocity	फलकम्:V2 km/s
Rotation period	presumed synchronous
Axial tilt	0
Albedo	0.26 (geometrical) 0.10 (Bond)
Surface temp.    solstice	min mean max ? ≈ 75 K 85 K
Apparent magnitude	14.5 (V-band, opposition)
Atmosphere
Surface pressure	zero

अम्ब्रिअल अरुण (युरेनस) ग्रहस्य एक उपग्रहः अस्ति। अकारे इदं अरुणस्य तृतीय महान्तमोपग्रहः। अम्ब्रिअलस्य वर्ण अरुणस्य अन्य उपग्रहाणां विपरीत:। अस्य वर्ण गूढतम:।

बाह्यसम्पर्कतन्तुः

• "Umbriel Profile". NASA's Solar System Exploration. आह्रियत 2009-10-10. 
• Lassell, Herrn W. (1852). "Entdeckung von 2 neuen Uranus Trabanten" (in German). Astronomische Nachrichten 33 (17): 259–262. Bibcode 1851AN.....33..259L. doi:10.1002/asna.18520331707. 
• "Edge-on!". Very Large Telescope. August 23, 2007. आह्रियत 2010-01-14. 
• Umbriel page (including a labelled map of Umbriel) at Views of the Solar System
• Umbriel Nomenclature from the USGS Planetary Nomenclature web site