Coordination System: 座标系统

• RA: Right Ascension (赤经)
• DEC: Declination (赤纬)
• Delta: Geocentric distance (地心距离)
• r: Heliocentric distance (日心距离)
• AU: Astronomical Unit (天文单位) (= 149597870 km)
• Elg: Elongation (离角)
• Az: Azimuth (方位角) (South = 0 degree)
• Alt: Altitude (仰角)
• Mv: Visual magnitude (视星等)

Orbital Elements: 轨道要素

• T: time of perihelion passage (通过近日点时刻)
• a: semi-major axis (半长轴)
• q: perihelion distance (近日点距离)
• e: eccentricity (离心率)
• i: inclination (轨道面与黄道面倾斜角)
• node: longitude of ascending node (升交点黄经)
• w: argument of perihelion (近日点引数)