Comets - C/2015 V2 Johnson - CK15V020
Type Hyperbolic Perihelion Date 12 June 2017 Perihelion Distance (q) 1.6 Aphelion Distance (Q) n/a Period (Years)   n/a Eccentricity (e)   1.00 Inclination (i)   49.9 Click for NASA orbit diagram
Hills Observatory: 1 January 2013 to 6 May 2018
COMETS COMETS
DEEP SKY DEEP SKY
Jess A Johnson discovered a 17th magnitude comet in Catalina Sky Survey images with the 0.68m Schmidt on November 3. The MPC preliminary elements suggested that the comet would reach perihelion at 0.9 au in 2017 February. JPL gave a 1-sigma uncertainty in the time of perihelion of 206 days and in perihelion distance of 0.6 au, so the elements were likely to change substantially.  Again a new MPEC was issued the next day (V62) and this gave perihelion at 1.6 au in 2017 June (which is now well determined).  The JPL elements were similar with the 1-sigma uncertainty now 5 days and an earth MOID of 0.7 au.  The elements suggest the comet could come into visual range in late 2016 and be well placed for viewing from the UK prior to perihelion, reaching around 6th or 7th magnitude.   The image below comprises 5 x Luminance (90 seconds each), 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 45 degrees on 21 January 2017.  The field of view is 29’ x 19’. Date 10x10 mag Error Kphot mag Coma ' 06-Nov-15 16.86 0.01 16.4 0.2 17-Nov-15 16.83 0.02 15.5 0.2 04-Dec-15 16.71 0.02 16.3 0.2 11-Dec-15 16.75 0.04 16.0 0.2 17-Dec-15 16.77 0.01 16.3 0.2 03-Feb-16   16.11 0.01 15.6 0.2 10-Feb-16 16.20 0.02 15.5 0.3 25-Feb-16 16.06 0.03 15.5 0.3 04-Mar-16 16.07 0.01 14.7 0.2 14-Mar-16 15.70 0.01 15.2 0.2 24-Mar-16 15.44 0.06 14.3 0.2 19-Apr-16 15.47 0.01 14.7 0.2 09-Jan-17 13.62 0.02 11.0 1.1 21-Jan-17 13.58 0.01 11.0 1.0 25-Jan-17 13.65 0.01 11.3 1.2 29-Jan-17 13.60 0.01 11.2 1.5 02-Feb-17 13.53 0.01 11.1 1.5 06-Feb-17 13.51 0.02 10.8 1.6 18-Feb-17 13.06 0.05 10.0 1.9 22-Feb-17 13.22 0.02 10.2 1.1 28-Feb-17 12.87 0.03 9.7 3.8 07-Mar-17 13.06 0.03 9.8 2.6 18-Mar-17 12.77 0.03 9.6 3.6 23-Mar-17 12.85 0.03 9.7 3.9 27-Mar-17 12.88 0.01 9.6 4.3 31-Mar-17 12.69 0.04 9.0 5.2 03-Apr-17 12.38 0.07 9.2 4.0 12-Apr-17 12.70 0.01 9.4 4.9 18-Apr-17 12.62 0.01 9.0 6.5 22-Apr-17 12.56 0.02 8.8 6.1 30-Apr-17 12.34 0.04 8.1 8.8 04-May-17 12.38 0.01 8.8 6.6 08-May-17 12.25 0.01 8.5 7.1 13-May-17 12.32 0.01 8.4 7.5 17-May-17 12.11 0.03 8.1 8.4 21-May-17 12.11 0.01 7.8 0.7 26-May-17 12.10 0.03 8.0 8.4 30-May-17 11.93 0.05 8.0 8.2 10-Jun-17 12.00 0.02 8.0 6.9 15-Jun-17 11.74 0.09 7.2 8.9 22-Jun-17 12.16 0.01 8.4 9.2 25-Jun-17 12.23 0.02 8.3 10.1 12-Jul-17 12.23 0.09 7.9 7.7 19-Jul-17 12.58 0.01 9.2 6.9 23-Jul-17 12.30 0.06 9.1 7.4 02-Aug-17 12.60 0.03 9.4 5.7 06-Aug-17 12.90 0.01 9.9 2.3
DEPARTED