Comets - C/2013 US10 (Catalina) - CK13U10S
Type Hyperbolic Perihelion Date 15 November 2015 Perihelion Distance (q) 0.8 Aphelion Distance (Q) n/a Period (Years)   n/a Eccentricity (e)   1.00 Inclination (i)   148.9 Click for NASA orbit diagram
Hills Observatory: 1 January 2013 to 10 July 2018
COMETS COMETS
DEEP SKY DEEP SKY
When discovered by the Catalina Sky Survey with the 0.68-m Schmidton on 31 October 2013, observations from another object from 12 September 2013 were used in the preliminary orbit determination giving an incorrect solution that suggested an orbital period of only 6 years. But by 6 November 2013 a longer observation arc from 14 August until 4 November made it apparent that the first solution had the wrong object from 12 September. By early May 2015 the comet was around apparent magnitude 12 and had an elongation of 60 degrees from the Sun as it moved further into the southern hemisphere. The comet came to solar conjunction on 6 November 2015 when the comet was around magnitude 6 and reached perihelion (closest approach to the Sun) on 15 November 2015 at a distance of 0.82 AU from the Sun. At perihelion, it had a velocity of 46.4 km/s (104,000 mph) with respect to the Sun which is slightly greater than the Sun's escape velocity at that distance. It crossed the celestial equator on 17 December 2015 becoming a northern hemisphere object. On 17 January 2016 the comet will pass 0.72 AU (108,000,000 km) from Earth and should be around magnitude 6 while located in the constellation of Ursa Major. C/2013 US10 is dynamically new. It came from the Oort cloud with a loosely bound chaotic orbit that was easily perturbed by galactic tides and passing stars. Before entering the planetary region (epoch 1950), C/2013 US10 had an orbital period of several million years. After leaving the planetary region (epoch 2050), it will be on an ejection trajectory. Date 10x10 mag Error Kphot mag Coma ' 16 Nov 13 17.83 0.29 17.6 0.2 23 Nov 13 18.21 0.10 17.8 0.2 12 Dec 13 18.06 0.08 17.9 0.2 17 Dec 13 18.14 0.12 18.0 0.2 16 May 14 16.57 0.04 16.3 0.2 8 Jun 14 16.24 0.15 16.1 0.2 14 Jun 14 16.18 0.06 16.1 0.2 3 Jul 14 15.93 0.02 15.6 0.2 12 Jul 14 15.67 0.11 n/a n/a 18 Jul 14 15.57 0.03 15.3 0.2 21 Jul 14 15.57 0.02 15.2 0.2 26 Jul 14 15.55 0.02 15.1 0.3 30 Jul 14 15.53 0.02 15.1 0.3 3 Aug 14 15.36 0.02 14.9 0.3 6 Aug 14 15.38 0.02 14.9 0.3 18 Aug 14 15.15 0.04 14.6 0.3 24 Aug 14 15.20 0.05 14.3 0.2 27 Aug 14 15.10 0.01 14.5 0.4 12 Sep 14 14.87 0.01 14.3 0.4 15 Sep 14 14.89 0.02 14.2 0.4 20 Sep 14 14.85 0.02 14.2 0.5 29 Sep 14 14.99 0.03 14.2 0.4 2 Oct 14 14.94 0.02 14.2 0.3 10 Oct 14 14.92 0.01 14.2 0.5 15 Oct 14 14.84 0.03 14.0 0.5 19 Oct 14 14.90 0.02 14.1 0.5 22 Oct 14 14.95 0.03 14.1 0.5 25 Oct 14 14.91 0.05 14.1 0.5 28 Oct 14 14.95 0.02 14.2 0.5 5 Nov 14 14.88 0.02 14.1 0.4 10 Nov 14 14.87 0.02 14.0 0.4 17 Nov 14 14.87 0.01 14.1 0.5 20 Nov 14 14.87 0.03 14.1 0.4 24 Nov 14 14.87 0.02 14.1 0.4 27 Nov 14 14.90 0.03 14.1 0.4 30 Nov 14 14.82 0.03 13.8 0.4 3 Dec 14 14.83 0.01 13.9 0.3 8 Dec 14 14.82 0.03 14.1 0.4 20-Apr-15 13.66 0.02 12.2 0.7 02-May-15 13.59 0.04 11.7 0.4 27-May-15 13.15 0.02 10.7 0.7 04-Jun-15 13.09 0.01 10.6 1.2 07-Jun-15 12.98 0.01 10.3 1.1 10-Jun-15 12.92 0.02 10.1 1.5 13-Jun-15 12.92 0.02 10.0 1.4 20-Jun-15 12.66 0.01 9.6 1.9 26-Jun-15 12.57 0.03 9.2 1.9 19-Jul-15 11.94 0.03 8.4 1.5 22-Jul-15 11.53 0.07 8.1 2.9 26-Jul-15 11.93 0.01 8.5 3.2 27-Jul-15 11.96 0.02 8.5 3.4 08-Aug-15 11.14 0.01 7.8 2.2 09-Dec-15 10.04 0.04 6.8 4.2 13-Dec-15 10.17 0.02 7.1 5.4 14-Dec-15 10.06 0.03 6.9 6.3 17-Dec-15 10.36 0.01 7.3 5.5 19-Dec-15 10.32 0.05 7.2 6.2 21-Dec-15 10.07 0.18 6.9 6.7 24-Dec-15 10.56 0.01 7.5 7.3 03-Feb-16   11.70 0.01 8.6 6.2 06-Feb-16   11.54 0.01 8.4 5.7 20-Feb-16 12.48 0.01 9.2 4.5 25-Feb-16 12.72 0.02 9.6 3.4 14-Mar-16 13.02 0.01 9.7 2.2 21-Mar-16 13.33 0.01 10.1 2.1 13-Apr-16 13.91 0.01 10.6 1.2 26-Aug-16 15.77 0.07 12.6 0.6 07-Oct-16 16.29 0.01 13.7 0.7 01-Nov-16 16.49 0.07 14.3 0.3 10-Nov-16 16.10 0.03 13.3 0.5 19-Dec-16 16.67 0.03 14.4 0.5 27-Dec-16 16.89 0.07 14.8 0.5 04-Jan-17 17.05 0.04 15.1 0.3 17-Jan-17 17.31 0.01 15.7 0.4 14-Feb-17 17.78 0.06 14.8 0.2
DEPARTED