बुध (चिं: ) सुर्द्यः मन्दः या छता ग्रह खः । थ्व ग्रह सूर्द्यः नापंया ग्रह खः । थ्व ग्रह सूर्द्यः व शुक्र या दथुइ लाः । थिथि धर्मय् थ्व ग्रहयातः थिथि कथं नालेगु याइ । थ्व ग्रह नाङ्गा मिखां हे खनेदु ।
बुध
Composite image of Mercury taken by MESSENGER probe Composite image of Mercury taken by MESSENGER
Designations Pronunciation
/ ˈ m ɜr k j ə r i / Adjective
Mercurian, Mercurial[१] Orbital characteristics [४]
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[२] Orbital period
Synodic period
115.88 d[२] Average orbital speed
47.87 km/s[२] Mean anomaly
174.796° Inclination
Longitude of ascending node
48.331° Argument of perihelion
29.124° Satellites
None Physical characteristics Mean radius
2,439.7 ± 1.0 km [५] [६]
0.3829 Earths
Flattening
0[६] Surface area
7.48× 10७ km2 [५]
0.147 Earths
Volume
6.083× 10१० km3 [५]
0.056 Earths
Mass
3.3022× 10२३ kg[५]
0.055 Earths
Mean density
5.427 g/cm3 [५] Equatorial surface gravity
Escape velocity
4.25 km/s[५] Sidereal rotation period
Equatorial rotation velocity
10.892 km/h (3.026 m/s) Axial tilt
2.11′ ± 0.1′ [७] North pole right ascension
18 h 44 min 2 s
281.01°[२]
North pole declination
61.45°[२] Albedo
Surface temp.
min
mean
max
0°N, 0°W [११]
100 K
340 K
700 K
85°N, 0°W[११]
80 K
200 K
380 K
Apparent magnitude
−2.6[९] to 5.7[२] [१०] Angular diameter
4.5" – 13"[२] Atmosphere[२] Surface pressure
trace Composition
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↑ ११.० ११.१ (19 February 1999) "Near-Surface Temperatures on Mercury and the Moon and the Stability of Polar Ice Deposits ". Icarus 141 : 179–193. DOI :10.1006/icar.1999.6175 . Figure 3 with the "TWO model"; Figure 5 for pole.