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+