OT: another update on NEA 2015 CA40
Our Near Earth Asteroid discovery (see earlier post) 2015 CA40 is now past it's point of closest approach. It reached that point, at 6.3 lunar distances, on Feb 23 near 21:49 UT.
The animated GIF above shows the asteroid early on Feb 24, about 12 hours after closest approach, imaged with the 0.61-m F/10 Cassegrain of MPC G68 Sierra Stars Observatory in California, USA. The animation is made from 6 images taken over a 10-minute timespan. Each image was 30 second exposure, and the images were separated by 2 minutes.
The observed orbital arc of the asteroid now extends from Feb 15.93 to Feb 24.58, or 8.5 days. Updated orbital elements from the MPC (MPEC 2015-D86, 26 Feb 2015):
Epoch 2014 Dec. 9.0 TT = JDT 2457000.5 M 298.05944 (2000.0) n 0.84818796 Peri. 176.19408 T = 2457073.52693 JDT a 1.1052859 Node 334.93169 q = 1.0044127 e 0.0912644 Incl. 15.06659 Earth MOID = 0.01553 AU P 1.16 H 24.6 From 147 observations 2015 Feb. 15-24, mean residual 0".74.
13 observatories have now contributed to the observations, including our own MPC 461 Piszkéstetö where we discovered the object, and two observatories I used myself for 'remote' observations: MPC G68 Sierra Stars Observatory in the US and Q65 Warrumbungle observatory in Australia. The full list of contributing observatories (up to 24 Feb 2015) is:
461 Piszkéstetö Stn. (Konkoly), Hungary
J95 Great Shefford, UK
246 Klet obs. KLENOT, Czechia
J69 North observatory, Clanfield, UK
703 Catalina Sky Survey, USA
F65 Haleakala-Faulkes Telescope North, Hawaii, USA
C47 Nonndorf, Austria
G68 Sierra Stars Observatory, Markleeville, USA
474 Mount John Observatory, New Zealand
A48 Povegliano Veronese, Italy
B18 Terskol, Russia
Q65 Warrumbungle, Australia
W87 Cerro Tololo-LCOGT C, Chile
The asteroid is currently only observable from the southern hemisphere.