Comet 2023 P1 Nishimura
Japanese amateur astronomer Hideo Nishimura discovered the comet in images he obtained using a 200-mm f/3 telephoto lens mounted on a Canon EOS 6D on 12 August 2023, when the comet was 1.0 AU from the Sun.
He also found it in images he exposed the previous night. The
comet upon discovery was located in the dawn sky and moving closer to
the Sun and has been less than 50 degrees from the Sun since April
Its apparent magnitude was estimated to be around 10–11.
Pre-discovery images from 19, 24, and 25 January 2023 from PanSTARRS were identified by Robert Weryk extending the observation arc to seven months.
The comet appeared in them as a stellar object with an apparent magnitude of about 22.
The comet brightened rapidly and by 27 August its apparent magnitude
was estimated to be 7.3 and its coma to have a diameter of 5
arcminutes, while a thin ion tail 1.5–2 degrees long is visible in
The comet was spotted with the naked eye by Piotr Guzik on 8 September at an estimated magnitude of 4.7.
The comet tail was 3.5 degrees long when imaged with CCD. On 12 September 2023 the comet passed 0.84 AU (126 million km; 78 million mi; 330 LD) from Earth but was only 15 degrees from the glare of the Sun.
On 17 September 2023 the comet came to perihelion 0.22 AU from the Sun. The
comet appeared briefly in the evening sky in mid September, being 5
degrees over the horizon 30 minutes after sunset at 35° north latitude.
Even though the comet reached a naked eye apparent magnitude of around +2, it was difficult to locate against the glare of the Sun. After perihelion, the comet became visible in the coronograph of STEREO, without showing signs of disintegration.
Went out last evening, August 20th, 2023 to setup the scope. Shot the Moon and the Dumbell, M27.
went to bed & set the clock for 3:00am. Got up & shot the new
comet, C/2023 P1, Comet Nishimura.
It was a very difficult shot being
down on my badly light polluted eastern horizon as the sun was rising.
I didn't have much luck with my Canon & 300mm lens. Too much light.
I did a little better with the ZWO ASI071 on the Orion EON ED80.
unfortunately, as the comet gets brighter, it gets closer to the sun, so pretty soon the comet will be lost to us and rising high for observers in the southern hemisphere....