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Semi-major axis. 17.737 au: Eccentricity: 0.96658: Orbital period (sidereal) ... Halley's Comet is the only known short-period comet that is consistently visible to ...
The Great January Comet of 1910, formally designated C/1910 A1 and often referred to as the Daylight Comet, [2] was a comet which appeared in January 1910. It was already visible to the naked eye when it was first noticed, and many people independently "discovered" the comet.
For elliptical orbits it can also be calculated from the periapsis and apoapsis since = and = (+), where a is the length of the semi-major axis. = + = / / + = + where: r a is the radius at apoapsis (also "apofocus", "aphelion", "apogee"), i.e., the farthest distance of the orbit to the center of mass of the system, which is a focus of the ellipse.
Comet 177P/Barnard, also known as Barnard 2, is a periodic comet with an orbital period of 122 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years). [4] It orbits near the ecliptic plane and has aphelion near the Kuiper cliff at 48 AU (7.2 billion km).
Also shown are: semi-major axis a, semi-minor axis b and semi-latus rectum p; center of ellipse and its two foci marked by large dots. For θ = 0°, r = r min and for θ = 180°, r = r max. Mathematically, an ellipse can be represented by the formula: = + ,
Newton also applied his theorem to the planet Mercury, [26] which has an eccentricity ε of roughly 0.21, and suggested that it may pertain to Halley's comet, whose orbit has an eccentricity of roughly 0.97. [25] A qualitative justification for this extrapolation of his method has been suggested by Valluri, Wilson and Harper. [25]
is the length of the semi-major axis. Conclusions: The orbital period is equal to that for a circular orbit with the orbital radius equal to the semi-major axis (), For a given semi-major axis the orbital period does not depend on the eccentricity (See also: Kepler's third law).
For comets with an orbital period of over 1000 years (semi-major axis greater than ~100 AU), see the List of near-parabolic comets. Comet designation Name / discoverer(s)