Return to the Cloudy Nights Telescope Reviews home page


Observing >> Solar System Observing

Pages: 1
Edward E
scholastic sledgehammer
*****

Reged: 03/26/06

Loc: Tucson, Arizona
No Opposition for Jupiter in 2013 new
      #5558976 - 12/07/12 10:17 AM

I was looking at some tables for opposition times of Jupiter and Saturn from 2000 to 2020 when I noticed that there will be no opposition for Jupiter in 2013. How often does this quirk of celestial mechanics happen?

Post Extras: Print Post   Remind Me!   Notify Moderator  
CPellier
scholastic sledgehammer


Reged: 08/07/10

Re: No Opposition for Jupiter in 2013 new [Re: Edward E]
      #5559194 - 12/07/12 12:14 PM

It may/must (?) happens once per jovian year, when the opposition month shifts from december to january. Last time was in 2001 (opp. was on january 2, 2002)

Post Extras: Print Post   Remind Me!   Notify Moderator  
Centaur
Vendor
*****

Reged: 07/12/04

Loc: Chicago
Re: No Opposition for Jupiter in 2013 new [Re: Edward E]
      #5561447 - 12/08/12 08:27 PM

Quote:

I was looking at some tables for opposition times of Jupiter and Saturn from 2000 to 2020 when I noticed that there will be no opposition for Jupiter in 2013. How often does this quirk of celestial mechanics happen?




The mean synodic period for Jupiter is about 13.1 months, i.e. the time it takes for Earth to lap Jupiter in their race around the Sun. Therefore about every 12 years a December opposition is followed by a January opposition, meaning a calendar year gets skipped. In the case of Mars this “quirk” occurs more regularly as its mean synodic period is about 25.6 months. Therefore alternate calendar years are skipped and occasionally two of them.


Post Extras: Print Post   Remind Me!   Notify Moderator  
PhilCo126
Post Laureate


Reged: 01/14/05

Loc: coastline of Belgium
Re: No Opposition for Jupiter in 2013 [Re: Centaur]
      #5569043 - 12/13/12 11:16 AM

Oppositions every #... days:

every 780 days for Mars
every 399 days for Jupiter
every 378 days for Saturn
every 369 days for Uranus
every 367 days for Neptune

Refractor-Phill


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
2 registered and 12 anonymous users are browsing this forum.

Moderator:  Rich (RLTYS), star drop, Mitchell Duke 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 813

Jump to

CN Forums Home




Cloudy Nights Sponsor: Astronomics