Alison Tripp and Nick Howes succesfully observe C/2007 Q3 (Siding spring) on March 27 and April 2 at the FTN (Faulkes Telescope North , Haleakala, Hawaii). After images stacking and futher processing, fragment b is clearly visible with offset about 6.5″ from fragment a. In this case I don’t use deconvolution, because fragment b can be measured without any filters. From previous images, obtained on March 23 and 25, splitted object increased distance from parent body.
The MPC has issued the new statement in MPC 69147. From now there is no point in submitting two-night discoveries, as they won’t be given priority over one-night discoveries received earlier by the MPC. As we can see, MPC gain an advantage to large sky surveys, and number of amateur discoveries will be reduced drastically.
Authors of this work is Wesley Fraser, Michael Brown from California Institute of Technology.
They report about WFPC2 observations of the Quaoar-Weywot system with WFPC2 of Hubble space telescope. From these observations they find that Weywot is on an elliptical orbit with eccentricity of e = 0.14±0.04, period of T = 12.438 ± 0.005 days. Scientist find, new estimated size, a diameter for Quaoar of D = 890±70 km and density to be ? = 4.2±1.3 g/cm3 – possibly the highest density in the Kuiper belt. This fact may indicate what Quaoar have collisionally origin, or what this object may formed more closely to the Sun.
When I seen information about spliting C/2007 Q3 nucleus, I tried to shot this event. Fragment is clearly visible on images taken on Tzec Maun and Tenagra II observatories on March 23 and 25. After processing stacked images I measure position of splited body. This object offset from parent body on 6? PA 245°. All inforamtion sended to CBAT.