Neptune and satellites Triton and Nereid with C11 on 23/24th Sept 2025

[Dennis]

Here we have the Planet Neptune (Magnitude: 7.81, Size: 2.3") and satellites Triton and Nereid as imaged from Brisbane on the evenings of 23rd and 24th September 2025.

According to SkyTools 4 Imaging, Neptune has a Diameter of 49528.0 km.

Name      Mag  PA°    Sep"
Triton    13.4 344.6  11.2
Nereid    18.7  62.9  409.0

Triton has a magnitude of 13.4, with Nereid at 18.68.

ST4 also writes that on September 23, 2025, Neptune was at opposition at magnitude 7.8 and subtending 2.3 arc seconds, something I did not know at the time of taking this set of images.

Neptune lies at an Earth Distance:  28.9 AU and Sun Distance:  29.9 AU.

I must say, it is nice to find Nereid in ST4, I previously had to visit the JPL Horizons website,  generate then download an ephemeris for Nereid, then manually plot the position to GoTo the RA and DEC coordinates. I also no longer have to worry about J2000 and Apparent.

Celestron 11” EDGE HD at F10, ASI 2600 MM Pro.
30x60 sec exposures.

Dennis.