최근 관측 가능한 혜성들과 궤도 요소들입니다.  (2013년 11월 12일 기준)

자동 천체 도입 망원경에서 혜성 궤도 요소들을 입력해서 넣을 때 필요한 정보들입니다.


Elements and Ephemeris for Comets 2013-11-12 New.pdf


Elements and Ephemeris for Comets  



 (http://cometchasing.skyhound.com/)

 

 cf. Peri.(ω),     Node(Ω),     Incl.(i)

 









 

( http://www.minorplanetcenter.net/iau/Ephemerides/Comets/index.html )

 

 

Explanation Of Orbital Elements

 

The quantities given in orbital elements published in the IAU CircularsMinor Planet Circulars and Minor Planet Electronic Circulars have the following meanings (for a detailed explanation of the physical meaning of these quantities, and on any relationships between different quantities, you are referred to standard textbooks on celestial mechanics):

Epoch

The epoch of osculation of the orbital elements.

M

Mean anomaly at the epoch.

T

Date of perihelion passage.

n

Mean daily motion (in degrees/day).

a

Semimajor axis (in AU).

z

Reciprocal semimajor axis (in 1/AU).

q

Perihelion distance (in AU).

e

Orbital eccentricity.

P

Orbital period (in years).

Peri. (ω)

The J2000.0 argument of perihelion (in degrees).

Node (Ω)

The J2000.0 longitude of the ascending node (in degrees).

Incl. (i)

The J2000.0 inclination (in degrees).

 

P and Q vectors

The vectors P and Q are an alternate form of representing the angular elements Peri., Node and Incl. For an explanation of how to convert between the two sets of quantities you are referred to standard celestial mechanics textbooks.

U

Uncertainty parameter.

 

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