Comet C/2023 H2 (Lemmon)

Discovered by astronomers at the Mt Lemmon Observatory on 2023 April 23, it reached perihelion on 2023 October 29, at a distance of 0.9 AU from the Sun and was closest to Earth (0.19 AU) on 2023 November 10. 

At the time of closest approach to Earth it achieved mag 6, but was too far north to be visible from southern Australia. In the days following it quickly travelled southwards to become visible in dark skies in the evening, with increasing Moon interference.


2023 November 18: photographed against the stars of Capricornus when about magnitude 7, with a 4-day old Moon nearby. A short tail is visible at about 1:30 on the clock face.

Takahashi TOA-130 + 1.5X expander/EM-200 Temma 2/SBIG STL 11000M combo: a series of 2 min exposures through R, G and B filters using  (44 mins total) at f11 were aligned on the comet, while series of R, G and B-filtered images (6 mins total) were separately aligned on the stars. These were then combined to optimise the comet against the star field; field of view ~0.6 x 0.4, north is to the right. 

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