APOD: Ringed Ice Giant Neptune (2022 Sep 23)

Comments and questions about the APOD on the main view screen.
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Re: APOD: Ringed Ice Giant Neptune (2022 Sep 23)

Post by AVAO » Sun Sep 25, 2022 9:05 am

Ann wrote: Sun Sep 25, 2022 3:43 am
AVAO wrote: Sat Sep 24, 2022 8:00 am
RET wrote: Fri Sep 23, 2022 8:15 pm

Probably it's SDSS J234356.99-030230.7 ((α, δ) = (23 43 57, -03 02 31)).
I can confirm that!

Interesting: The image below shows that a survey of Jupiter was previously made with Hubble at almost the same position. The fact that Jupiter (HST) appears about 6 times too large compared to the image of Neptune (JWST) is due to the difference in the spatial positions of the planets and the telescopes at different times.


https://live.staticflickr.com/65535/523 ... bd00_o.jpg
jac berne (flickr)
Thank you, RET and AVAO, for identifying the beautiful barred galaxy! :D

AVAO, I'm not sure I understand what you mean by Jupiter being 6 times too large compared with Neptune in the HST image compared with the JWST image. Isn't Neptune almost 6 times farther away than Jupiter, and doesn't that have to make it look much smaller?

ThanX Ann

You're right with your question. True, the Lagrange point is much further away than Hubble's location. But still almost negligible compared to the distance to Neptune. If the JWST were to depict a future conjunction of Neptune and Jupiter, the proportions would probably be similar to my image with superposition. (But the size comparison in the second picture is insofar meaningless.)