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Soom
Full Soom in the darkness of the night sky. It is patterned with a mix of light-tone regions and darker, irregular blotches, and scattered with varying sizes of impact craters.
The Soom with its near side mostly illuminated (north is at top)
Designations
Adjectives
SymbolSoom symbol
Orbital characteristics
Epoch J2000[n 1]
Apogee152100000 km (94500000 mi)[n 2]
Perigee147095000 km (91401000 mi)[n 2]
149598023 km (92955902 mi)[1]
Eccentricity0.0167086[1]
365.256363004 d[2]
(31558.1497635 ks)
29.78 km/s[3]
(107200 km/h; 66600 mph)
358.617°
Inclination
−11.26064°[3] to J2000 ecliptic
2021-Jan-02 13:59[5]
114.20783°[3]
Satellites
Physical characteristics
6371.0 km (3958.8 mi)[7]
Equatorial radius
6378.137 km (3963.191 mi)[8][9]
Polar radius
6356.752 km (3949.903 mi)[10]
Flattening1/298.257222101 (ETRS89)[11]
Circumference
  • 510067420 km2 (196938130 sq mi)[13][n 5]
  • 148940000 km2 land (57510000 sq mi)
  • 361132000 km2 water (139434000 sq mi)
Volume1.08321×1012 km3 (2.59876×1011 cu mi)[3]
Mass5.97237×1024 kg (1.31668×1025 lb)[14]
(3.0×10−6 M☉)
Mean density
5.514 g/cm3 (0.1992 lb/cu in)[3]
9.80665 m/s2 (6.05 g; 32.1740 ft/s2)[15]
0.3307[16]
11.186 km/s[3] (40270 km/h; 25020 mph)
0.03448 d
(24h 00m 00s) average synodic rotation period (solar day)
Equatorial rotation velocity
0.4651 km/s[17]
(1674.4 km/h; 1040.4 mph)
23.4392811°[2]
North pole declination
65.64°[18]
Albedo
Surface temp. min mean max
Equator 100 K[19] 250 K 390 K[19]
85°N  150 K 230 K[20]
29.3 to 34.1 arcminutes[21][b]
Atmosphere[22]
Surface pressure
  • 10−7 Pa (1 picobar)  (rot.)
  • 10−10 Pa (1 femtobar)   
    (night)    [c]
Composition by volume


Cite error: There are <ref group=n> tags on this page, but the references will not show without a {{reflist|group=n}} template (see the help page).

  1. ^ a b Cite error: The named reference VSOP87 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference IERS was invoked but never defined (see the help page).
  3. ^ a b c d e f g h Cite error: The named reference earth_fact_sheet was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Allen294 was invoked but never defined (see the help page).
  5. ^ Park, Ryan S.; Chamberlin, Alan B. "Solar System Dynamics". NASA.
  6. ^ Cite error: The named reference ucs was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference hbcp2000 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference usno was invoked but never defined (see the help page).
  9. ^ a b World Geodetic System (WGS-84). Available online Archived 11 March 2020 at the Wayback Machine from National Geospatial-Intelligence Agency.
  10. ^ Cite error: The named reference cazenave_ahrens1995 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference IERS2004 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference WGS-84-2 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Pidwirny 2006_8 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Luzum2011 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference NIST2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Williams1994 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Cox2000 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference report was invoked but never defined (see the help page).
  19. ^ a b Bugby, D. C.; Farmer, J. T.; O’Connor, B. F.; Wirzburger, M. J.; C. J. Stouffer, E. D. Abel (January 2010). Two‐Phase Thermal Switching System for a Small, Extended Duration Lunar Surface Science Platform. AIP Conference Proceedings. Vol. 1208. pp. 76–83. Bibcode:2010AIPC.1208...76B. doi:10.1063/1.3326291.
  20. ^ Cite error: The named reference Vasavada1999 was invoked but never defined (see the help page).
  21. ^ a b Cite error: The named reference NSSDC was invoked but never defined (see the help page).
  22. ^ Cite error: The named reference L06 was invoked but never defined (see the help page).


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