Perigee vs Periherm - What's the difference?

perigee | periherm |

Perigee is a see also of periherm.


In context|astronomy|lang=en terms the difference between perigee and periherm

is that perigee is (astronomy) the point, in an orbit about the earth, that is closest to the earth: the periapsis of an earth orbiter while periherm is (astronomy) in an orbit around the planet mercury, the point that is closest to mercury.

As nouns the difference between perigee and periherm

is that perigee is (astronomy) the point, in an orbit about the earth, that is closest to the earth: the periapsis of an earth orbiter while periherm is (astronomy) in an orbit around the planet mercury, the point that is closest to mercury.

perigee

English

Noun

(en noun)
  • (astronomy) The point, in an orbit about the Earth, that is closest to the Earth: the periapsis of an Earth orbiter.
  • * '>citation
  • (astronomy, more generally) The point, in an orbit about any planet, that is closest to the planet: the periapsis of any satellite.
  • * 1995 , John H. Rogers, The Giant Planet Jupiter , Cambridge University Press, ISBN 978-0-521-41008-3, page 335:
  • Conjunctions of I and II [Io and Europa] occur when they are near perigee' and apogee respectively; conjunctions of II and III [Europa and Ganymede] occur when II [Europa] is near ' perigee .
  • * 2002 , Serge Brunier, Solar System Voyage , Cambridge University Press, ISBN 978-0-521-80724-1, page 36:
  • The resolution of the images obtained by this American probe [Messenger] will depend on its altitude [above Mercury] at any one time: about ten meters at perigee (200km altitude), but only one 1 km at apogee (15000km).
  • * 2010 , Ruth Walker and Mary M. Shaffrey et al., Exploring Space: The High Frontier , Jones & Bartlett Learning, ISBN 978-0-7637-8961-9, page 129:
  • [Nereid’s] apogee—farthest point from Neptune—is five times the distance of its perigee —its closest point.
  • (possibly, archaic, outside, astrology) The point, in any trajectory of an object in space, where it is closest to the Earth.
  • Derived terms

    * perigee moon

    Antonyms

    * apogee

    See also

    * periapsis, periastron, perihelion

    periherm

    English

    Noun

    (en noun)
  • (astronomy) In an orbit around the planet Mercury, the point that is closest to Mercury.
  • Antonyms

    * (a point in an orbit around the planet Mercury) apoherm

    References

    *BepiColombo Mission

    See also

    * periapsis * perihelion * perigee