AP 21

Blazar CTA 102

blazar 4c 1169

Normally shining at magnitude 17, 8 billion LY-distant quasar CTA 102 commenced a spectacular outburst in November 2016, rising 250-fold in brightness to mag 11.2 in this image of Dec 28, 2032 UT.  Never in the history of observational astronomy has a comparable level of sustained brightness been manifested by an object at such vast distance. With (A) mag 9.7 TYC 1154-141-1 in Pegasus.

 

Comet 41P/ Tuttle–Giacobini–Kresák

Mar 25 2017, 2156 UT; est mag 7.5. Distance 13.5 million miles, apparent diameter ~ 10 arcminutes, perihelion April 12. This year’s apparition represents the closest approach to Earth since discovery in 1858. With (a) mag 7.2 HIP 57284 in Ursa Major. [19th observed comet] Below: exiting the body of the Plough, same night.

 

Venus – Narrowing Crescent 2017

March 11, 1718 UT; 7% illumination, 22° elongation

 

March 14, 1820 UT; 5% illumination, 18° elongation

 

March 16, 1818 UT; 3.8% illumination, 16° elongation in more turbulent air

 

March 24, 1632 UT – 20 hours before inferior conjunction, sunset 1855 UT; 1.0% illumination, 8.5° elongation.

 

Supernova 2017 eaw

22 million LY distant, light from a record-extending 10th supernova (Type IIP) in the Fireworks Galaxy, NGC 6946, reached Earth on May 14 2017. The closest and brightest N Hemisphere supernova since SN 2014J in M82. Est mag 12.8, with (a) mag 10.1 TYC 4246-221-1 in Cygnus. Image radius 15′. May 19 2017, 0059 IST.