Author of the Month :  The Official forums
Join us at this forum every month for a discussion with famous popular authors from around the world. 
Welcome! Log InRegister
Hi Carol - Good questions.

1.Sirius is a possibility for a myriad of reasons but you are right it is a bit far to imagine we could orbit the center of mass (roughly 6.6ly) in ~24,000 years. Nonetheless, some suggest it is possible, including astrophysicist Reg Cahill of Australia who calculates the solar system is moving ~430km/s, almost the exact speed required. But he measures relative to the CMB and it is uncertain if this is the right methodology. Some also argue that parallax measurements might need adjustment by a factor of 2 to 4x but I have not studied this enough to comment. With current precession theory effectively constraining solar system motion to zero it may take awhile before these issues are seriously examined. Yes, Alpha Centauri appears to be closer but it is much farther off plane, whereas Sirius is closer to our plane and closer to the Pluto and Sedna inclines. It is interesting to note that Barnard's Star lies in the opposite direction, roughly in line, and it has the highest proper motion of any nearby star. Your questions about perturbations are difficult to answer until we know what is going on. Heck, no one is even certain what keeps Sedna in its current position - and that is much closer than anything we are now discussing.

2. I am skeptical of the brown dwarf scenario for exactly that reason (although it could be against the galactic center background where there is a lot of noise), but there are some very good scientists, including Mike Brown at Caltech, that are seriously looking for such an object, partially because Sedna demands the presence of another massive object.

3. It is hard to prove a negative (such as x object does NOT exist) but lunisolar theory has much bigger problems. Certainly there are some local effects like nutation but the bulk of what we call the lunisolar effect (sun moving across sky at about 50.3"p/y) is probably just a reference frame issue, and this is why there appears to be so little precession relative to local objects and so much relative to distant objects (outside the moving solar system).

“Truly the greatest gift you can give is that of your own self-transformation.”
Chinese Philosopher – Lao Tzu

Options: ReplyQuote

Subject Views Written By Posted
The Celestial Clock 298 Walter Cruttenden 03-Sep-12 20:20
Re: The Celestial Clock 118 Dr. Lew Graham 03-Sep-12 21:51
Re: The Celestial Clock 121 Walter Cruttenden 03-Sep-12 23:33
no lost star, only knowledge.. 118 hendrik dirker 06-Sep-12 16:34
Re: no lost star, only knowledge.. 78 Walter Cruttenden 07-Sep-12 03:20
Re: no lost star, only knowledge.. 126 hendrik dirker 08-Sep-12 17:52
The solar system moves 86 Walter Cruttenden 09-Sep-12 00:20
Re: The solar system moves 119 hendrik dirker 09-Sep-12 15:43
Re: The solar system moves 59 Walter Cruttenden 10-Sep-12 07:15
It is what it is 90 hendrik dirker 11-Sep-12 23:00
Re: It is what it is 107 Walter Cruttenden 12-Sep-12 04:38
Re: The Celestial Clock 82 Corpuscles 03-Sep-12 22:52
Re: The Celestial Clock 84 Walter Cruttenden 03-Sep-12 23:57
Re: The Celestial Clock 82 carolb 04-Sep-12 02:24
Re: The Celestial Clock 47 Walter Cruttenden 04-Sep-12 19:22
Re: The Celestial Clock 102 Nolondil 05-Sep-12 23:41
Re: The Celestial Clock 46 Walter Cruttenden 07-Sep-12 20:56
Re: Yes, I get the occasional negative response 114 Thunderbird 04-Sep-12 03:08
Luna Capture 109 Dr. Lew Graham 04-Sep-12 04:00
Re: Luna Capture 83 Thunderbird 04-Sep-12 15:51
Mythology on Luna Capture 84 Dr. Lew Graham 05-Sep-12 04:09
Re: Luna Capture 148 Audrey 05-Sep-12 04:09
Re: Yes, I get the occasional negative response 59 Walter Cruttenden 04-Sep-12 19:25
Re: The Celestial Clock 96 Bibhu Dev Misra 04-Sep-12 08:42
Re: The Celestial Clock 86 Walter Cruttenden 04-Sep-12 19:39
Re: The Celestial Clock 91 Bibhu Dev Misra 05-Sep-12 08:25
Re: The Celestial Clock 97 Walter Cruttenden 05-Sep-12 19:59
Re: The Celestial Clock 58 Sirius7237 04-Sep-12 16:11
Re: The Celestial Clock 72 Walter Cruttenden 04-Sep-12 20:32
Re: The Celestial Clock, 63 michael seabrook 05-Sep-12 21:53
Re: The Celestial Clock, 88 Walter Cruttenden 06-Sep-12 06:54
Re: The Celestial Clock, 81 michael seabrook 06-Sep-12 21:00
The 'correct' time on the Celestial Clock, 88 Dr. Lew Graham 06-Sep-12 21:16
Re: The 'correct' time on the Celestial Clock, 103 carolb 06-Sep-12 22:49
Explain 21 December 2012 precisely? 84 Dr. Lew Graham 06-Sep-12 23:21
Re: The 'correct' time on the Celestial Clock, 87 michael seabrook 07-Sep-12 14:13
Re: The 'correct' time on the Celestial Clock, 58 Walter Cruttenden 07-Sep-12 21:24
Re: The 'correct' time on the Celestial Clock, 90 michael seabrook 08-Sep-12 12:21
Re: The 'correct' time on the Celestial Clock, 57 Walter Cruttenden 08-Sep-12 19:34
Re: The 'correct' time on the Celestial Clock, 96 Bibhu Dev Misra 09-Sep-12 07:37
Re: The 'correct' time on the Celestial Clock, 43 Walter Cruttenden 10-Sep-12 07:41
Re: The Celestial Clock 77 Bibhu Dev Misra 07-Sep-12 19:17
Re: The Celestial Clock 92 Walter Cruttenden 08-Sep-12 19:27
Queastion: Earth crust displacement 97 finaltom 30-Sep-12 02:52
Re: Queastion: Earth crust displacement 103 Walter Cruttenden 30-Sep-12 21:56
Re: Queastion: Earth crust displacement 72 finaltom 30-Sep-12 23:04

Sorry, only registered users may post in this forum.