Muskegon Astronomical Society, User Defined Object

C/2009 R1 (McNaught) Epoch 2010 June 13.0 TT = JDT 2455360.5 T 2010 July 2.6852 TT MPC q 0.405037 (2000.0) P Q z -0.000824 Peri. 130.7014 -0.4149301 -0.6912649 +/-0.000007 Node 322.6216 +0.1933677 +0.5683588 e 1.000334 Incl. 77.0332 +0.8890680 -0.4462300

The textbox above contains a sample comet definition. The first line of the definition should be the object description. There must be a "T" for the time at Perihelion, and a "q" for the Perihelion distance. There must be a "Peri." for the argument of perihelion. There must be a "Node" for the longitude of the ascending node, with an optional epoch year (defaults to 2000). There must be "Incl." for the inclination. Eccentricity "e" is optional and defaults to 1.0.

For the latest comet ephemeris from Seiichi Yoshida, click here. For the latest observable comets from IAU/MPC, click here.

Once you find an object, text highlight the definition, then [Ctrl]-[C] to copy it to the clipboard. Place your text cursor in the textbox above, delete the current object, then [Ctrl]-[V] to paste your new object. Press [Submit] to submit your new object. Once the pasted object definition is complete, the following JavaScript sheets will display it:

• Planet Positions
• Planet Positions, Current
• Planetary Rise/Set Times*
• Planetary Rise/Set Times #2*
• Planet Positions, Orrery #2*