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बुध

Composite image of Mercury taken by MESSENGER probe Composite image of Mercury taken by MESSENGER
Designations
Pronunciation	/ˈmɜrkjəri/
Adjectives	Mercurian, Mercurial
Symbol
Orbital characteristics
Epoch J2000
Aphelion	69,816,900 km 0.466 697 AU
Perihelion	46,001,200 km 0.307 499 AU
Semi-major axis	57,909,100 km 0.387 098 AU
Eccentricity	0.205 630
Orbital period (sidereal)	87.969 1 d (0.240 846 a) 0.5 Mercury solar day
Orbital period (synodic)	115.88 d
Average orbital speed	47.87 km/s
Mean anomaly	174.796°
Inclination	7.005° to Ecliptic 3.38° to Sun’s equator 6.34° to Invariable plane
Longitude of ascending node	48.331°
Argument of perihelion	29.124°
Known satellites	None
Physical characteristics
Mean radius	2,439.7 ± 1.0 km 0.3829 Earths
Flattening	0
Surface area	7.48×10७ km2 0.147 Earths
Volume	6.083×10१० km3 0.056 Earths
Mass	3.3022×10२३ kg 0.055 Earths
Mean density	5.427 g/cm3
Surface gravity	3.7 m/s2 0.38 g
Escape velocity	4.25 km/s
Sidereal rotation period	58.646 day 1407.5 h
Equatorial rotation velocity	10.892 km/h (3.026 m/s)
Axial tilt	2.11′ ± 0.1′
North pole right ascension	18 h 44 min 2 s 281.01°
North pole declination	61.45°
Albedo	0.068 (Bond) 0.142 (geom.)
Surface temp. min mean max 0°N, 0°W 100 K 340 K 700 K 85°N, 0°W 80 K 200 K 380 K
Apparent magnitude	−2.6 to 5.7
Angular diameter	4.5" – 13"
Atmosphere
Surface pressure	trace
Composition by volume	42% Molecular oxygen 29.0% sodium 22.0% hydrogen 6.0% helium 0.5% potassium Trace amounts of argon, nitrogen, carbon dioxide, water vapor, xenon, krypton and neon

बुध (चिं: ) सुर्द्यः मन्दःया छता ग्रह खः । थ्व ग्रह सूर्द्यः नापंया ग्रह खः । थ्व ग्रह सूर्द्यः व शुक्रया दथुइ लाः । थिथि धर्मय् थ्व ग्रहयातः थिथि कथं नालेगु याइ । थ्व ग्रह नाङ्गा मिखां हे खनेदु ।

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