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.

Nova Lyrae 2017

NvLyr2017

ISS Lunar Transit

ISS Lunar Transit Jul 12 2017, 040057 UT from Finbarr C on Vimeo.

Perseid Meteor

perseid 13aug2017

Aug 13 2017, 0040 IST. Adjacent is mag 2.9 gamma Persei.

Asteroid (3122) Florence

Discovered by Schelte Bus in 1981, the 4th largest Near Earth Asteroid passes 4.4 million miles from the home planet on Sep 1 2017, 0112 IST. It is the largest asteroid to approach this closely since the original NEO discovery over a century ago, and will not be closer until 2500. Est mag 8.9; with (a) HIP 103932 in Aquarius. Below: the 30,000 mph velocity is apparent in these images taken 12 minutes apart –

Active Region 2673, 2674

Active region x flare

Sep 5 2017, 1833 IST. A number of X-class flares were emitted from AR 2673 (lower) during this week.

CHAPTER XXII