Rare occultation of the star by Neptune’s moon Triton on 2022 October 6

On October 6, 2022, Triton (the largest natural satellite of the planet Neptune) occulted 11.5-mag star TYC 5254-00839-1, and this rare phenomenon (for example, a list of future events is available on page 10 here: https://www.iota-es.de/JOA/JOA2018_2.pdf ) could be seen in Asia. It was a rare opportunity to study Triton's atmosphere from Earth, as I had a similar experience with occultation of the star by Saturn's moon Titan this year: https://www.youtube.com/watch?v=tCk9u41A2q8

The observations were made at Yanqi Lake Observatory, UCAS (40°24’29.34’’N 116°40’14’’E; elevation: 96 meters), contributors: Filipp D. Romanov (Филипп Д. Романов)¹, Yiming Mao (毛益明)², Renhao Ye (叶人豪)², Qianyi Zou (邹乾一)², Yongkang Sun (孙永康)², Yueyue Shen (沈越月)² and Jingyuan Zhao (赵经远)³: 

¹ Amateur astronomer, Russia; member of the AAVSO;
² School of Astronomy and Space Science, University of Chinese Academy of Sciences, 1 East Yanqi Lake Rd., Beijing 100049, P.R. China;
³ Shandong Astronomical Society, Weihai, Shandong 264209, China.

The observations were made at 0.7-m f/6.5 Corrected Dall-Kirkham telescope (PlaneWave CDK700), with camera Andor iKon-L DZ936-BV and Rc filter, shutter speeds were 1 second for each frame as I requested. I made a light curve from the resulting photos and determined the occultation moments:

Occultation by atmosphere started at 14:37:59.8 UT (2459859.10972 JD),
Occultation by disc started near 14:38:12.77 UT (2459859.10987 JD),
Occultation by disc ended near 14:39:55.58 UT (2459859.11106 JD),
Occultation by atmosphere ended at 14:40:12.0 UT (2459859.11125 JD).

The light curve shows that the beginning and end of the occultation occur gradually due to Triton's atmosphere. If a small central flash has occurred, it is not good visible due to magnitude errors.

The above observation was remote from me, I attempted to observe in my small homeland, in Primorsky Krai of Russia, with amateur astronomer Dmitrii N. Grishin (Дмитрий Н. Гришин from Ussuriysk) and my mother Larisa V. Romanova (Лариса В. Романова). I tried to observe this phenomenon at 42°52'02.6"N 132°39'24.2"E (42.867379, 132.656724): in Livadiya, Nakhodka, using 0.355-m f/4.5 reflector (Sky-Watcher Dob 14", with camera Canon EOS 6D) of Dmitrii, who brought by car his astronomical equipment close to the predicted central line of the occultation, but during the occultation the cloudiness was so dense that only Jupiter was visible through it, and the gaps in the clouds appeared later, and I was able to take photos of Neptune near this star only after the end of occultation.