On Jan. 30 I discovered a few new objects. Due to the full Moon and bad weather, I could not attempt to get the second night till Feb. 8.
O004B4 C2007 01 30.31523 10 02 31.48 +10 07 09.6 20.1 R H07
O004B4 C2007 01 30.32063 10 02 31.28 +10 07 10.3 20.8 R H07
O004B4 C2007 01 30.32595 10 02 30.94 +10 07 09.6 20.6 R H07
Total rate = 0.21 deg/day or 0.525 arcsec/min, PA = 270.14
O004B4 C2007 02 08.34709 09 54 53.15 +10 11 43.4 20.5 R H07
O004B4 C2007 02 08.35432 09 54 52.69 +10 11 44.3 20.5 R H07
Total rate = 0.23 deg/day or 0.575 arcsec/min, PA = 290.1

The first night arc is only 15 minutes long and the two nights are now 9 nights apart, so I am not sure whether I could recover them amd make sure that they are the same object. Amazingly the second nights position was only North of prediction by 2'! An arc 15 min long projected 900 times longer is off by 2'?

It turn out that it is the same object and MPC designated it 2007 BK73 and the orbit must be real, as station G96 detect it on Feb. 7 and 691 got it on Feb. 8 too. And most important, everything fit and form a nice orbit.

But I also need to mention, out of the three two night discoveries I thought I had, only two are good and one turn out to be linked incorrectly. So there is room for inprovement but it is still lot of fun :-)

Bill Yeung

2007 BK73

Display all designations for this object
Epoch 2007 Jan. 20.0 TT = JDT 2454120.5 MPCM 330.08729 (2000.0) P Qn 0.18766555 Peri. 223.94526 -0.99360201 -0.01064368 T = 2454279.89370 JDTa 3.0214333 Node 315.07325 +0.06541576 -0.86578330 q = 2.6005336e 0.1393046 Incl. 9.16114 -0.09206427 -0.50030590P 5.25 H 16.3 G 0.15From 12 observations 2007 Jan. 30-Feb. 8. Residuals20070130 *H07 0.2- 0.1- 20070207 G96 0.3+ 0.0+ 20070208 691 0.1+ 0.1+20070130 H07 0.7+ 0.5+ 20070207 G96 0.5- 0.1- 20070208 691 0.2- 0.3+20070130 H07 0.5- 0.3- 20070207 G96 0.2+ 0.1+ 20070208 H07 0.6+ 0.4-20070207 G96 0.1+ 0.2- 20070208 691 0.4- 0.1+ 20070208 H07 0.2- 0.2+

An 26,000 year period companion?

We all know that our Earth's rotational axis seemingly precess roughlyonce every 26,000 years or so. Our present theory said that this iscaused by the gravity of Sun, Moon and the oblation of the Earth. Thisis called the Lunisolar Theory.

Lately I read a book called "Lost Star of Myth and TIme", the authorCruttender agrues that IF our Sun is in a binary system and have a27,000 year period, then EVEN if the Earth axis didn't precess, thewhole solar system would still rotate by 50" or so per year inreference to the inertia space.The reference frame is very important.

We used to believe that ourEarth is stationary and thus the center of the universe, and thus wehave to invent those "epic" (?) circle to explain the funny emotion ofthe planets. Now as we consider precession is an observational fact,but is it caused by the actual precession of Earth's axis? Or by thefact that our Sun is travelling through a curve in space?

I found this theory very interesting. Would anyone care to comment onwhich theory is true?